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Academic literature on the topic 'CFD study'

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Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "CFD study"

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A., Aswandi, B. L. Syaefullah, D. A. Iyai, and M. Jen Wajo. "UTILIZATION OF CARBOHYDRATE POTENTIAL IN VARIOUS KINDS OF BANANA COB FLOUR BANANA IN KACANG GOATS." IRAQI JOURNAL OF AGRICULTURAL SCIENCES 53, no. 4 (August 30, 2022): 732–42. http://dx.doi.org/10.36103/ijas.v53i4.1583.

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The objective of this research was to observe the productivity in kacang goats which were given a complete feed containing flour of various types of banana plant weevils. The material studied in this study was six complete types of feed. Complete feed containing weevil flour from 5 banana plant varieties. Complete feed is prepared with a complete feed composition. The cattle used were 18 male bean goats, mean initial body weight, 15.42 ± 1.98 kg (CV: 13.73%) aged 10-15 months. Livestock is given complete feed containing banana weevil flour for 60 days. The cage is 12 m x 6m in size, construction has a floor platform as high as 140 cm, the enclosure is 1 x 1 m in size and 130 cm in height, equipped with a drinking area. The treatment was in the form of 6 complete types of feed with different formulations, consisting of CF0, CF1, CF2, CF3, CF4, and CF5 containing banana weevil flour with different varieties and control treatment (CF0). The research design used was a completely randomized design with five treatments of complete feed formulas containing hump flour of various banana varieties.The results of the research that the complete feed formulation containing Batu banana hump flour (CF2) and Kapok (CF3) produced the best productivity and performance response of Kacang goat. compared to treatment; CF0 CF1; CF4 and CF5.
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Scheer, Justin K., Jessica Tang, Johnny Eguizabal, Azadeh Farin, Jenni M. Buckley, Vedat Deviren, R. Trigg McClellan, and Christopher P. Ames. "Optimal reconstruction technique after C-2 corpectomy and spondylectomy: a biomechanical analysis." Journal of Neurosurgery: Spine 12, no. 5 (May 2010): 517–24. http://dx.doi.org/10.3171/2009.11.spine09480.

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Object Primary spine tumors frequently involve the C-2 vertebra. Complete resection of the lesion may require total removal of the C-2 vertebral body, pedicles, and dens process. Authors of this biomechanical study are the first to evaluate a comprehensive set of reconstruction methods after C-2 resection to determine the optimal configuration depending on the degree of excision required. Methods Eight human heads (from the skull to C-6) from 4 males and 4 females with a mean age of 68 ± 18 years at death were cleaned of tissue, while leaving ligaments and discs intact. Nondestructive flexion and extension (FE), lateral bending (LB), and axial rotation (AR) tests were conducted using a nonconstraining, pure moment loading apparatus, and relative motion across the fusion site (C1–3) was measured using a 3D motion tracking system. Specimens were tested up to 1.5 Nm at 0.25-Nm intervals for 45 seconds each. The spines were instrumented using 3.5-mm titanium rods with a midline occipitocervical plate (4.0 × 12–mm screws) and lateral mass screws (excluding C-2) at the C-1 (3.0 × 40 mm) and C3–5 levels (3.0 × 16 mm). Testing was repeated for the following configurations: Configuration 1 (CF1), instrumentation only from occiput to C-5; CF2, C-2 corpectomy leaving the dens; CF3, titanium mesh cage (16-mm diameter) from C-3 to C-1 ring and dens; CF4, removal of cage, C-1 ring, and dens; CF5, titanium mesh cage from C-3 to clivus (16-mm diameter); CF6, removal of C-2 posterior elements leaving the C3–clivus cage (spondylectomy); CF7, titanium mesh cage from C-3 to clivus (16-mm diameter) with 2 titanium mesh cages from C-3 to C-1 lateral masses (12-mm diameter); and CF8, removal of all 3 cages. A crosslink was added connecting the posterior rods for CF1, CF6, and CF8. Range-of-motion (ROM) differences between all groups were compared via repeated-measures ANOVA with paired comparisons using the Student t-test with a Tukey post hoc adjustment. A p < 0.05 indicated significance. Results The addition of a central cage significantly increased FE rigidity compared with posterior instrumentation alone but had less of an effect in AR and LB. The addition of lateral cages did not significantly improve rigidity in any bending direction (CF6 vs CF7, p > 0.05). With posterior instrumentation alone (CF1 and CF2), C-2 corpectomy reduced bending rigidity in only the FE direction (p < 0.05). The removal of C-2 posterior elements in the presence of a C3–clivus cage did not affect the ROM in any bending mode (CF5 vs CF6, p > 0.05). A crosslink addition in CF1, CF6, and CF8 did not significantly affect primary or off-axis ROM (p > 0.05). Conclusions Study results indicated that posterior instrumentation alone with 3.5-mm rods is insufficient for stability restoration after a C-2 corpectomy. Either C3–1 or C3–clivus cages can correct instability introduced by C-2 removal in the presence of posterior instrumentation. The addition of lateral cages to a C3–clivus fusion construct may be unnecessary since it does not significantly improve rigidity in any direction.
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Wichangarm, Mana, Anirut Matthujak, Thanarath Sriveerakul, Sedthawatt Sucharitpwatskul, and Sutthisak Phongthanapanich. "Simulation Study of LPG Cooking Burner." International Journal of Engineering & Technology 7, no. 3.7 (July 4, 2018): 142. http://dx.doi.org/10.14419/ijet.v7i3.7.16257.

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The objective of this paper is to numerically study the flow feature and combustion phenomena of an energy-saving cooking burner using three-dimensional computational fluid dynamics (CFD). Combustion temperatures were experimentally and numerically investigated in order to not only validate the CFD model, but also describe the combustion phenomena. From the temperature comparison, the CFD model was good agreement with the experiment, having the error of less than 5.86%. Based upon the insight from the CFD model, the high temperature of 1,286 K occurred at the middle of the burner. The high intensive vortex of the flow being enhanced the combustion intensity and the heat transfer coefficient is obvious observed near the burner head inside the ring. Therefore, it is concluded that the burner ring is the major part since it controls flame structure, high temperature region, intensive combustion region, heat loss and suitable flow feature. However, heat transfer to the vessel should be further clarified by the CFD model.
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Li, Tingwen, and Chris Guenther. "A CFD study of gas-solid jet in a CFB riser flow." AIChE Journal 58, no. 3 (May 16, 2011): 756–69. http://dx.doi.org/10.1002/aic.12619.

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Jørgensen, Rasmus Thy, Gunvor Rossen Tonnesen, Matthias Mandø, and Simon Pedersen. "Comparative Study of CFD and LedaFlow Models for Riser-Induced Slug Flow." Energies 13, no. 14 (July 20, 2020): 3733. http://dx.doi.org/10.3390/en13143733.

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The goal of this study is to compare mainstream Computational Fluid Dynamics (CFD) with the widely used 1D transient model LedaFlow in their ability to predict riser induced slug flow and to determine if it is relevant for the offshore oil and gas industry to consider making the switch from LedaFlow to CFD. Presently, the industry use relatively simple 1D-models, such as LedaFlow, to predict flow patterns in pipelines. The reduction in cost of computational power in recent years have made it relevant to compare the performance of these codes with high fidelity CFD simulations. A laboratory test facility was used to obtain data for pressure and mass flow rates for the two-phase flow of air and water. A benchmark case of slug flow served for evaluation of the numerical models. A 3D unsteady CFD simulation was performed based on Reynolds-Averaged Navier-Stokes (RANS) formulation and the Volume of Fluid (VOF) model using the open-source CFD code OpenFOAM. Unsteady simulations using the commercial 1D LedaFlow solver were performed using the same boundary conditions and fluid properties as the CFD simulation. Both the CFD and LedaFlow model underpredicted the experimentally determined slug frequency by 22% and 16% respectively. Both models predicted a classical blowout, in which the riser is completely evacuated of water, while only a partial evacuation of the riser was observed experimentally. The CFD model had a runtime of 57 h while the LedaFlow model had a runtime of 13 min. It can be concluded that the prediction capabilities of the CFD and LedaFlow models are similar for riser-induced slug flow while the CFD model is much more computational intensive.
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Wu, Yuan Ze, Yi Sun, Hai Tao Shi, and Bai Feng Ji. "Study on Downburst Wind Load under Characteristic Topography." Applied Mechanics and Materials 580-583 (July 2014): 2958–61. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.2958.

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Gemorphological type is the important factor influencing the downburst wind profile. In this thesis, firstly we determine four categories of landform types under the criteria of roughness. The CFD pre-processing software GAMBIT was used to build considering the landscape type's downburst CFD computational model. Then, the established CFD computational model was imported to the calculated hydrodynamics software FLUENT to take the numerical simulation of the downburst under different landforms. Finally, in allusion to the numerical simulation result, make the research of the wind characteristics.
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Al-Yasiri, Mortatha Al-Yasiri, Amthal Al-Gailan Al-Gailan, and Dongsheng Wen Wen. "CFD Study of Cuttings Transport through Vertical Wellbore." Journal of Petroleum Research and Studies 8, no. 3 (May 6, 2021): 158–78. http://dx.doi.org/10.52716/jprs.v8i3.279.

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Cuttings transportation from the bit up the annulus to the surface is one the essentialfunctions that are performed by drilling fluid. Predication of drilling fluid efficiency totransport cuttings in the annulus is very complicated due to numerous parameters that haveaffected drilling operations. Computational Fluid Dynamics (CFD) is widely used as anumerical technique in handling complex multiphase flow problems in differentoperational conditions.The present work has taken the advancement of CFD to computationally analyse theinfluence of the effects of various parameters like drilling fluid rheology, flow rate, piperotation, cuttings density, shape, concentration and drilling fluid- cuttings particle couplingregimes on the cuttings transport in a vertical wellbore. The CFD simulation was carriedout by using transient solver of ANSYS-FLUENT CFD commercial code.The dense discrete phase model (DDPM) is suggested in this work to overcome themain shortcomings of Eulerian–Eulerian and CFD-DEM approaches in simulating drillingfluid-cuttings flow. Also, some of the experimental investigations were involved indetermining the fluid physical properties and essential input data to perform the CFDsimulations. Regarding the results validation and verification, well agreement has beenachieved between results obtained in this study with those reported in other studies
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Wang, Chenye, Caifei Ding, Zhoujia Hua, Chunyue Chen, and Jia Yu. "Cangfudaotan Decoction Alleviates Insulin Resistance and Improves Follicular Development in Rats with Polycystic Ovary Syndrome via IGF-1-PI3K/Akt-Bax/Bcl-2 Pathway." Mediators of Inflammation 2020 (November 24, 2020): 1–16. http://dx.doi.org/10.1155/2020/8865647.

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Polycystic ovary syndrome (PCOS) is the most common endocrine and metabolic disorder prevalent in females of reproductive age; insulin resistance (IR) is the major pathogenic driver. Pharmacology is a basic option for PCOS therapy; traditional Chinese medicine (TCM), as a significant part of complementary and alternative medicine, has a long history in the clinical management of PCOS. Cangfudaotan decoction (CFD) has been used clinically for gynaecological diseases especially PCOS. In this study, first, chemical components in CFD were clarified using UPLC-Q/TOF-MS analysis. Then, an animal model of PCOS was established, granular cells were also isolated from the rats with PCOS, and CFD was administrated at different dosages in PCOS rats and granular cells, to investigate the therapeutic effect and mechanisms of CFD for PCOS treatment. The result showed that CFD treatment is effective in PCOS rats and granulosa cells. CFD was able to improve IR, restore the serum hormone levels, inhibit the inflammatory cytokines in PCOS rat, and alleviate ovary morphological injury and apoptosis in PCOS rats. In granulosa cells of PCOS, the result showed that the cell viability was improved, and cell apoptosis was inhibited after CFD administration. Further experiments suggested that CDF improves IR, follicular development, cell apoptosis, and inflammatory microenvironment, and this was associated to the regulation of IGF-1-PI3K/Akt-Bax/Bcl-2 pathway-mediated gene expression. Given that CFD sufficiently suppresses insulin resistance and improves follicular development in this study, exploring these mechanisms might help to optimize the therapeutic treatment of CFD in PCOS patients.
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Kumar, Gaurav, Rohit Kumar, Sagar Dagar, and Raj Kumar Singh. "Comparative Study of Different Missile Shapes using Computational Fluid Dynamics." International Journal of Advance Research and Innovation 8, no. 3 (2020): 72–83. http://dx.doi.org/10.51976/ijari.832012.

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Aerodynamics study using computational fluid dynamics is very famous among the engineers and scientists, because it not only reduces the cost of the entire project but also saves a lot more time. The results of the CFD simulations needed to validate through experiments. So, we can say that CFD simulation studies reduce the no. Of experiments taken, if it cannot eliminate. In this research paper, we made four different aerodynamics missiles shapes CAD models in solid works by using underlying principles, mathematical equations of different curves and engineering judgement, one of them is a missile of standard basic shape. We have analysed and compared them with basic shape of missile. Here, in this study, Volume is taken a constant parameter. Drag Coefficient is the main parameter which is evaluated and studied at different Mach no’s and at a constant angle of attack. Reasons behind the magnificent drop in drag coefficient explained in discussion section.
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Masubuchi, Masahiro. "Comparative Study of Mixing Tank Flow between the Continuum CFD and Particle method CFD." Proceedings of The Computational Mechanics Conference 2016.29 (2016): 4_158. http://dx.doi.org/10.1299/jsmecmd.2016.29.4_158.

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Dissertations / Theses on the topic "CFD study"

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Björk, Johan. "Compressor CFD simulation method development : A CFD study." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69880.

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This master thesis project consisted of three parts that all were performed through CFD simulations with the purpose to develop Scania's methods in the subject of CFD. All parts included simulations on Scania's SC92T70 centrifugal compressor. Part one consisted of performing a mesh study for the purpose of reliability, to investigate the convergence of different parameters by refining the boundary layer. The method used is an inflation option called First layer thickness. Five different meshes were generated where the Richardson extrapolation method was used to examine the parameters between the mesh renements. From the result from the examined parameters, an approximate relative error could be calculated to be less than 0.52 %, and a numerical uncertainty of less than 0.35 %, between Mesh3 and Mesh4. In addition to that, Mesh3 had a simulation time of one hour less than for Mesh4. These results motivated the use of mesh3 to be refined enough for further work in this thesis project. This mesh ended at 37, 915, 257 number of elements. The second part consisted of performing steady state CFD simulations, to examine different parameters in order to find indications of the phenomena surge. Here, experimental data was used as reliance to perform CFD simulations on the compressor. Design points from experimental data was used, that ranged from low mass flow rates where surge arises, to high mass flow rates where another phenomena called choke occur. Except for the design points taken from experimental data, a few extra design points where included at low mass flow rates (in the region of surge). The goal was that the analysis of the different parameters would generate fluctuations on the result for the design points in surge region. Four different rotational speeds on the compressor were examined, 56k, 69k, 87k and 110k revolutions per minute. A total of 140 different parameters were examined, where 10 of these indicated on surge. All of these parameters that indicated on surge where found in regions of vicinity to the compressor wheel, which are the regions subjected to the phenomena.The parameters indicating on surge where mass flow, pressure coefficient, static pressure and temperature. Indications where found at the wheel inlet, ported shroud, and wheel outlet interfaces. The indications were only found for the two lower rotational speeds of the compressor wheel. To capture the behaviour on higher rotational speeds, more design points in the region of surge are needed, or transient simulations. Part three of the thesis project consisted of investigating the methodology of performing a Conjugate Heat Transfer model (CHT) with the CFD code CFX. This part has not been performed by Scania before, so a big part of the problem was to investigate if it actually was achievable. The goal was to use this model to calculate the heat transfer between fluid and solid parts, as well as between the solid parts and the ambient. One question Scania wanted to answer was if the CHT model could generate aerodynamic performance that corresponds to Scania's traditional adiabatic model, as well as to experimental data of the compressor. In this part, both solid and fluid domains were included in the geometryto calculate heat transport, in contrast to the traditional adiabatic model that only uses the fluid domains. Because of that, a big part of the work consisted of defining all interfaces connecting together surfaces between all domains. This is needed to model heat transport between the domains. In the set up part in CFX, the CHT model differed a lot from the traditional adiabatic model in that way that the outer walls was not set up as adiabatic anymore. In the CHT model, instead heat transfer is allowed between the outer walls of the fluids and the solids. From the result simulations, one could see that the CHT model was able to compute the heat transfer between fluids and solids. It also managed to export thermal data such as heat flux and wall heat transfer coefficient to be used for mechanical analysis, which is an important part in Scania's work. From the analysis of aerodynamic performance, a conclusion was drawn that the CHT model was able to compute efficiency and pressure ratio that followed the behaviour ofthe traditional adiabatic model as well as experimental data. However, for lowermass flows, the CHT model started to underpredict which could be explained by the geometrical differences between the CHT and adiabatic model. By analysis of temperature, one could see quantitative differences compared to the traditional adiabatic model. For other parameters (static and total pressure), there were no experimental data to be used for comparison. Because of that, an important part in future work of this CHT method development is to perform more experimental test for CFD data to be compared against. Another important part to compare the models is to have an identical geometry. Without an identical geometry, deviations in result will occur that depends on geometry.
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Dall'Olio, Giacomo. "CFD study of electric motor's cooling." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Nowadays electrification is one of the leading fields of engineering as it is seen as one of the key factors that can reduce environmental impact of human activities by reducing theirs polluting emissions. Mobility is the sector in which electric driven systems are diffusing the most. The search for performance in one of its main component, the electric motor, is therefore of fundamental importance in terms of efficiency and reliability of every electric driven applications. The optimization of thermal aspects covers a primary role and highly affect power consumption and lifetime of components. With this intent the use of CFD, Computational Fluid Dynamics, allows to exploit most of heat transfer aspects which concurs on thermal behavior both for design phase and performance estimations. The work of this thesis investigates the cooling performances of the motor driving an electric vehicle made by Engines Engineering -EE- which is a company that projects motorbikes for thirds and is recently going to expand in the field of electric mobility. Beside the specific case studied, the methods can be extended to any component which require a thermal management as CFD tools are fundamental in a very wide spectrum of application in engineering.
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Palipana, Aruna Susantha. "CFD modelling of natural gas combustion in spark ignited engines." Thesis, Loughborough University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327653.

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Poutiainen, Aaron. "Undertray Design and Development Procedure with CFD : An Optimization Study of Different UndertrayDesigns with CFD Computations." Thesis, KTH, Strömningsmekanik och Teknisk Akustik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301732.

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Race car aerodynamics has played a vital part to improve lap times over the years of motor racing. Having good road adhesion with slick tires and aerodynamic downforce will increase the vehicles maximum lateral force and thus higher cornering speeds can be achieved. The undertray and diffuser is the most efficient aerodynamic component on most racing vehicles and is capable of producing six times more downforce than its contribution to drag plus, if optimized correctly, able to significantly reduce the vehicle's drag coefficient. The intent of this project is to optimize a completely unique undertray design for the KTH Formula Student teams racing vehicle DeV17. The undertray is inspired by the Aston Martin Valkyrie venturi tunnel design and is optimized by iterative change in CAD design parameters for three different chassis designs. The results are obtained with CFD RANS simulations using the k-ω (SST) turbulence model with the Siemens Star-CCM+software. The optimum design gave 530 N and 90 N of downforce and drag respectively at a velocity of 80km/h. The venturi tunnel design is proven to give a 29% downforce improvement over a conventional flat plate design with stronger longitudainal vortices and lower, more widespread, minimum pressure distribution. The most important aspects that affect downforce in undertray design is concluded to be a diffuser outlet height, upsweep and vehicle ground clearance. No specific aerodynamic advantages in having a convergent tapering of the tunnel cross-section is observed, meaning the undertray can be represented as only consisting of an expanding diffuser. The tunnel design is considered to give promising track testing results and be a spark for further innovative ideas with aerodynamic design for both the automotive and racing industry.
Tävlingsbilars aerodynamik has spelat en viktig roll för att förbättra varvtiderna under åren inom motorsport. Att ha god väghäftning med 'slicks' däck och aerodynamisk nedåtkraft kommer att öka fordonets maximala sidokraft förmåga och därmed kan högre hastigheter i kurvor uppnås. Underredet och diffusern är den mest effektiva aerodynamiska komponenten på de flesta racerfordon och kan producera sex gånger mer nedåtkraft än dess bidrag till luftmotståndet och, om den optimeras korrekt, kan den avsevärt minska fordonets luftmotståndskoefficient. Syftet med detta projekt är att optimera en helt unik underredes design för KTH Formula Student lagets racingfordon DeV17. Underredet är inspirerat av Aston MArtin Valkyrie venturitunnel design och optimeras av iterativ förändring av CAD designparametrar för tre olika chassidesigner. Resultaten erhålls med CFD RANS-simuleringar med turbulensmodellen k-ω (SST) och programvaran Siemens Star-CCM+. Den optimala designen gav 530 N och 90 N nedåtkraft respektive luftmotstånd under en hastighet på 80 km/h. Venturitunnel designen har visat sig ge en förbättring på 29% nedåtkraft jämfört med en konventionell platt design, med starkare längsgående virvlar och lägre, mer utbredd, minimitryckfördelning. De viktigaste aspekterna som påverkar nedåtkraft i underredes designen dras som slutsats till att vara diffuser utloppets höjd, upphöjning vinkeln och fordonets markfrigång. Inga specifika aerodynamiska fördelar med att ha en konvergerande avsmalning av tunnelns tvärsnitt obververades, vilket innebär att underredet kan antas endast bestå av en expanderande diffuser. Tunneldesignen anser ge lovande bantestresultat och vara en gnista för ytterliga innovativa idéer inom aerodynamisk design för både bil- och racingindustrin.
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Seim, Bjarte Grytli. "Study of Hydrofoil Wakes Using PIV and CFD." Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9929.

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In this master thesis the wake of a hydrofoil have been investigated using PIV. The main goal of this work have been to investigate how vortex generators can create mixing and smoothing of the velocity deficit in hydrofoil wakes. This study is motivated by the rotor stator interactions in Francis turbines with the idea that smoother wakes from the stator can reduce the forces on the rotor and hence increase the life span of Francis turbines. A literature survey of foil theory and wake flows have been carried out. This survey motivated the use of a normalization of the velocity in the wake. Experimental work was carried out at the water tunnel facility at Saint Anthony Falls Laboratory at the University of Minnesota. Tests were performed on a NACA0015 hydrofoil with four different vortex generator configurations, for a range of different angles of attack and velocities. Lift and drag forces on the hydrofoil was measured using a force balance. Because the drag measurement had poor accuracy, it could not be used to compare the different vortex generator configurations in terms of drag. As a result the drag was investigated using the velocity deficit in the wakes. The quality of this analysis have been discussed with the use of CFD. CFD is also used to gain insight into how pressure and velocity is distributed in the water tunnel. The PIV images from the tests have been processed into vector fields with the commercial PIV software DaVis7. For analyzing the PIV data further, different post-processing schemes in DaVis7 was investigated together with programs developed in Matlab. In order to compare the wakes resulting from the use of different vortex generators with measurable quantities, the use of a standard wake profile has been investigated. The standard wake profile is symmetrical and could hence only describe wake measurements done at an angle of attack close to $0^{circ}$. Furthermore it turned out that most vortex generators resulted in a wake that could not be described with the standard wake profile. The vortex generator configurations that gave the best smoothing of the hydrofoil wake for the investigated operation points turned out to be a $1unit{mm}$ V-shaped vortex generator. This vortex generator also caused less drag than than the other vortex generators tested. However, the use of vortex generators resulted in increased drag compared to the plain hydrofoil for the analyzed operating points. The velocity deficit in the wake is shown to get so well smoothed out for some tested cases that it is considered worth while to continue the investigation on vortex generators capability to increase the lifespan of Francis turbines.

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Yu, Hongtao. "A Validation Study of SC/Tetra CFD Code." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1399896316.

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Aguirre, John. "Study of 3-Dimensional Co-Flow Jet Airplane and High-Rise Building Flow Using CFD Simulation." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_theses/181.

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The purpose of this thesis is to design and study an aircraft which implements the Co-Flow Jet (CFJ) airfoil concept, as well as to study the CAARC standard highrise building. The design concept is verified mainly by the use of a Computational Fluid Dynamics (CFD) package. A thorough methodology for geometry and mesh generation is developed, and subsequently applied to the two cases. The first case studied is that of the CFJ Airplane (CFJA). It consists of a threedimensional, highly blended, ying wing geometry implementing the Co-Flow Jet airfoil concept. Though a thorough comparison to a baseline geometry, it is shown that usage of the CFJ airfoil cross-section greatly improves aircraft performance by increasing lift, reducing drag, and providing a source of thrust over the operational range of angles of attack. A steady state CFD simulation is used for this case, as the air ow around an airfoil cross-section is inherently steady for attached ows. CFD results are used to support the Engineless Aircraft" concept, where the CFJ airfoil is used as the sole form of propulsion. The second case studied consists of a rectangular high-rise building undergoing a wind condition with Mach number of 0:1 and a Reynolds number of 160000. Due to the non-streamlined geometry of the building cross-section, aerodynamic instabilities due to uid separation are present, and therefore an unsteady CFD analysis is necessary to fully resolve all of the ow phenomena. Preliminary steady state results are presented, and a plan is laid down for the future study of this highly complex case. Results are presented for a variety of angles of attack in the case of the CFJA, and for the main ow direction in the case of the CAARC building. Results are compared with baseline geometry in the case of the CFJ Airplane. The CFJ Airplane case is simulated using a 3rd order steady state scheme, which is sufficient to achieve valid results for the ow regime. The CAARC building, which has inherent ow separation, requires the use of high order schemes.
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Ghoddoussi, Armin. "A conceptual study of airfoil performance enhancements using CFD." Thesis, Wichita State University, 2011. http://hdl.handle.net/10057/5048.

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A conceptual study of performance enhancing devices for an airfoil is performed using Computational Fluid Dynamics. Three simple, passive devices are examined to explore alternate methods for stall control and lift-to-drag improvement. The motivation behind this research is to study effective techniques to improve performance with fewer drawbacks than previously existing methods. An evaluation scheme is presented to compute airfoil lift, drag and pitching moment for a range of angles-of-attack up to stall. NACA 641-212 single-element and slatted airfoil CFD results are compared with experimental data to validate the computational model. Evaluations on the first conceptual design (Stall vane) show elimination of the separation at 15 degrees of angle-of-attack where the flow reversal normally starts at 86% - chord. A total drag increase of 22% is detected because of the sharp leading-edge of the device, but the main element drag has a reduction of 43%. The maximum lift coefficient does not show a significant change on the same model. The second device (Cylinder) has a negative effect, initiating flow separation and causing a significant decrease in lift-to-drag ratio at a given lift coefficient. The third device (Dimples) demonstrates the potential of lift-to-drag ratio improvement at the higher angle-of-attack. Further investigation is required to verify the results since the improvement is small.
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Aerospace Engineering.
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Yu, Larry Liaobo. "A CFD study on direct injection two-stroke engines." Thesis, Glasgow Caledonian University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287858.

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This thesis presents the research on direct-fuel-injection (DFI) performance analyses of the two-stroke engine using computational fluid dynamics (CFD). The aims of this research are: (1) to generate a finite volume mesh that can be used to simulate the moving of the piston and opening and closing the ports of the cylinder, (2) to achieve an numerical flow pattern of the scavenging process and (3) to study the DFI process using the mesh and the flow pattern obtained from the first two parts. The three parts in the analyses, therefore, are the engine geometry modelling, scavenging process modelling and DFI modelling. CFD software STAR-CD was used to write the programme and perform the analysis. The geometry model used a moving mesh mechanism with variable openings to simulate the piston motion and port area changes. The scavenging model was constructed to calculate 3D, compressible, turbulent, transient flow with heat transfer and changing volume. Results of the calculation provided a large number of data, including flow patterns, pressure and temperature distributions and fresh-charge concentrations. The DFI process was simulated as a gasliquid two-phase flow. Fuel droplets dispersed in the continuous gas phase were calculated using the Lagrangian model. Four DFI cases that differ in position and number of injectors were simulated. Fuel droplet distribution, including droplet size, velocity, temperature and position, and fuel-vapour concentration were obtained. The result of the geometry modelling shows that the finite volume programme performed well for this particular task. Because of the limitation of the computer hardware used, this programme was restricted to be used for the simulation of the engine process before the ignition, i. e., cold running condition, therefore, combustion process was not included. The findings from the analyses, with very limited resources, would help improve the engine design. The results of all four cases indicate that, even only for the period of engine process before the ignition, the DFI two-stroke engine can significantly reduce hydrocarbon emissions compared with the conventional carburettor engine.
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Norrby, David. "A CFD Study Of The Aerodynamic Eects OfPlatooning Trucks." Thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203931.

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In the present work the aerodynamic forces on trucks driving in so-called platoon are investigated in a numerical fashion. Driving in platoon, or convoy, refers to in an orderly manner driving in a line, one truck after the other, taking advantage of the unrecovered _ow behind each truck. The phenomenon is called slipstreaming or drafting. The Compu- tational Fluid Dynamics (CFD) software STAR-CCM+ is used to calculate the flow field around a platoon consisting of two and three trucks at different distances, ranging from 5 to 70 m. Two numerical approaches are used, one is the Reynolds Averaged Navier Stokes based (RANS) two-equation turbulence model k 􀀀 " realizable model with a two-layer treatment. The second one is the Menter's Shear Stress Transport (SST) k 􀀀 ! Detached Eddy Simulation (DES) model. The first one is time independent, so-called steady-state, where platoons consisting of two and three trucks are used in the simulations. However, the nature of the flow field around vehicles is inherently time-dependent, which makes it difficult to receive a steady-state solution and thus, the reliability of the result is neg- atively affected. The second model is time dependent and much more computationally expensive, where only a platoon consisting of two trucks is simulated. Addition to this, simulations with an isolated truck will be conducted in order to make a relative study for both turbulence models. Since numerous of errors are introduced when approaching the problem numerically, it is important to have a reference case to compare with, set under the same conditions. Also, comparisons with other studies are done. A mesh independent study is conducted with the function of investigating how the mesh density influences the result, together with a mesh quality study, both helpful when assessing the credibility of the results. For the RANS approach, it is shown that for the 2-truck platoon, drag reductions are the greatest at the closest distance, 5 m, with 26:9 and 28:1 % reductions in drag for the leading and trailing vehicle, respectively, compared to the isolated case. There is an increase in drag for both vehicles with increasing distance, however, the trend turns around at 10 m for the trailing vehicle, where it also reaches its maximum, 5:5 % larger drag than that of the reference case's. Then a reduction is seen for all distances greater than 11 m. For the leading truck, the drag coeffcient CD is equal to the reference case's around 18 m, with an overshoot of 2 􀀀 3 % afterward, which may be a result of numerical errors. The same trend is seen for the 3-truck platoon, with largest reductions at the closest distance 5 m, with the reductions 31:5 %, 48:5 % and 33:2 % for truck one, two and three, respectively. At 10 m, there is also an abrupt increase in drag for the trailing trucks, however, the drag never reaches over the drag of an isolated truck. An overshoot is also seen for the first vehicle in the 3-truck platoon and it stops benefiting from platoon driving around 22 m. It was found that at 10, thick low-velocity boundary layers were formed on the leading trucks, which may be one of the reasons for the increase in drag. For the time-dependent approach, the drag behavior is similar to the RANS cases for the leading vehicle, but no overshoot is seen, instead the drag is always smaller than the reference case's. The maximum reduction is also found at 5 m, with the value 31:7 %. A completely different trend is found for the second vehicle, where the drag decreases with increasing distance, where there is a minimum reduction at 5 m (4:0 %) and a maximum reduction at the largest investigated distance 50 m (24:3 %). This kind of trend is also seen for the RANS-based simulation in the interval 10 􀀀 50 m, but the reductions are not as large. After 12 m, the trailing truck benefits the most. It was found that the vortices and the time dependence of the flow field are important features. The RANS-based model produced poor results in region of strong swirl and therefore it is not a suitable model for the flows of this type. Also, based on the good agreement with PowerFlow VLES (Very Large Eddy Simulation) simulations with the DES ones even further puts great distrust on the RANS simulations. The k 􀀀 " realizable model with a two-layer treatment has also shown deficiencies in predicting the downstream effects (over predicts) and the size and intensity of recirculation areas (for instance, the wake) as shown in the work of P.L. Davis, A.T. Rinehimer and M. Uddin, 20th Annual Conference of the CFD Society of Canada.
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Books on the topic "CFD study"

1

Fejtek, Ian G. A CFD study of tilt rotor flowfields. Stanford, Calif: Stanford University, 1989.

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L, Roberts, and Joint Institute for Aeronautics and Acoustics., eds. A CFD study of tilt rotor flowfields. Stanford, CA: Stanford University, Dept. of Aeronautics and Astronautics, 1989.

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Don, Freund, Sajben Miklos, and United States. National Aeronautics and Space Administration., eds. Study of CFD methods applied to rapidly deforming boundaries. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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Don, Freund, Sajben Miklos, and United States. National Aeronautics and Space Administration., eds. Study of CFD methods applied to rapidly deforming boundaries. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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E, Smith C. A CFD study of jet mixing in reduced flow areas for lower combustor emissions. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1991.

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A, Rhodes James. A study of flow separation in transonic flow using inviscid and viscous CFD schemes. Norfolk, Va: Institute for Computational and Applied Mechanics (ICAM), Old Dominion University, 1988.

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E, Smith C. A CFD study of jet mixing in reduced flow areas for lower combustor emissions. [Washington, D.C: NASA, 1991.

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V, Talpallikar M., Holdeman J. D, and United States. National Aeronautics and Space Administration., eds. A CFD study of jet mixing in reduced flow areas for lower combustor emissions. [Washington, D.C: NASA, 1991.

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G, Hunter Louis, and United States. National Aeronautics and Space Administration., eds. CFD study of turbo-Ramjet interactions in hypersonic airbreathing propulsion system: Final report : under contract NAG3-1500. [Washington, DC: National Aeronautics and Space Administration, 1997.

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G, Hunter Louis, and United States. National Aeronautics and Space Administration., eds. CFD study of turbo-Ramjet interactions in hypersonic airbreathing propulsion system: Final report : under contract NAG3-1500. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Book chapters on the topic "CFD study"

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Lalmi, Djemoui, and Redjem Hadef. "Study of Swirl Contribution to Stabilization Turbulent Diffusion Flame." In CFD Techniques and Energy Applications, 179–94. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70950-5_9.

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Hamdi, Nassereddine. "CFD Study About an Archimed Wind Mill." In Lecture Notes in Mechanical Engineering, 167–74. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11827-3_16.

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Ezzahra, Lakhal Fatma, Agrebi Senda, and Mouldi Chrigui. "CFD Study of a Pulverized Coal Boiler." In Advances in Mechanical Engineering and Mechanics, 257–64. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19781-0_31.

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Olsen, Jan Erik, Michal Ksiazek, and Merete Tangstad. "CFD Study on Continuous Tapping of Silicon." In Furnace Tapping 2022, 109–19. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92544-4_9.

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Frikha, Sobhi, Zied Driss, Hedi Kchaou, and Mohamed Salah Abid. "Study of the Incidence Angle Effect on a Savonius Wind Rotor Aerodynamic Structure." In CFD Techniques and Energy Applications, 161–77. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70950-5_8.

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Pandey, Vinod, Gautam Biswas, and Amaresh Dalal. "Study of Pool Boiling Through Numerical Approach." In 50 Years of CFD in Engineering Sciences, 607–44. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2670-1_17.

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Sharma, Meeta, and Danish Hussain. "An Investigative Study on Motorbike Through CFD Solar." In Proceedings of International Conference in Mechanical and Energy Technology, 195–208. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2647-3_18.

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Oliveira, Ricardo F., Ana C. Ferreira, Senhorinha F. Teixeira, José C. Teixeira, and Helena Cabral-Marques. "A CFD Study of a pMDI Plume Spray." In Transactions on Engineering Technologies, 163–76. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8832-8_13.

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Petcu, Dana, Daniel Vizman, and Marcin Paprzycki. "Porting CFD Codes Towards Grids: A Case Study." In Parallel Processing and Applied Mathematics, 817–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11752578_98.

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Gołdasz, Janusz, and Bogdan Sapiński. "CFD Study of the Flow of MR Fluids." In Insight into Magnetorheological Shock Absorbers, 117–30. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13233-4_6.

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Conference papers on the topic "CFD study"

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Besagni, Giorgio, Riccardo Mereu, and Emanuela Colombo. "CFD Study of Ejector Efficiencies." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20053.

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This paper presents a method to evaluate ejector efficiency in function of local flow parameters. The paper is divided into two parts. In the first part, a Computational Fluid-Dynamics (CFD) approach for convergent nozzle ejectors is presented and computational results are validated using experimental velocity and temperature profiles at different sections. The validation process includes the evaluation of seven Reynolds-Averaged Navier–Stokes (RANS) turbulence models: the Spalart-Allmaras and the k–omega SST models show better performance in terms of convergence capability and flow and thermal field prediction. In the second part, local flow phenomena and their influence on ejector component efficiencies are investigated. The validated CFD approach is used to determine the efficiencies of the ejector primary nozzle, suction chamber, and mixing zone. Efficiency maps, regressing equation linking efficiencies, and local flow quantities are proposed and discussed. Finally, global ejector performance is mapped and considerations are outlined.
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Musu, Ettore, Riccardo Rossi, Roberto Gentili, and Rolf D. Reitz. "CFD Study of HCPC Turbocharged Engine." In SAE 2010 Powertrains Fuels & Lubricants Meeting. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2010. http://dx.doi.org/10.4271/2010-01-2107.

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Peri, Shrinivas, and Brian M. Rogers. "Computational Fluid Dynamics (CFD) Erosion Study." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2007. http://dx.doi.org/10.2118/110463-ms.

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Ashutosh Pandey and H. A. Ingley. "CFD Study of Rodent Isolator Cages." In 2005 Tampa, FL July 17-20, 2005. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2005. http://dx.doi.org/10.13031/2013.19832.

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Oakley, Owen H., and Yiannis Constantinides. "CFD Truss Spar Hull Benchmarking Study." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29150.

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Blind comparisons of computational fluid dynamics (CFD) predictions are made against large scale experiments of a truss spar hull. The overall objective of the work is to try and mature CFD modeling capability related to motion and loads for offshore platforms. Specific goals include the testing of newly developed meshing techniques and seeking an understanding of how spar appurtenances interact. The key comparisons are illustrated in comparisons of the simple case of a spar hull with stakes alone against a second, far more complex case, involving multiple appurtenances. The latter exhibits very different vortex induced motion (VIM) behavior. The CFD predictions were made with knowledge of the as-built model details, but without access to the experimental results. The estimates were found to be in close agreement with the experiments or slightly conservative. We continue to observe that the better the model fidelity, the better will be the comparison with the benchmark. The computations show that high quality predictions are now feasible, given access to sufficient computational hardware and accurate meshing of the body in question.
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Kumar, Kurichi, Chetan Desai, and Mike Flinn. "A CFD Study of Squeeze Film." In Earthmoving Industry Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1994. http://dx.doi.org/10.4271/941083.

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Mikjaniec, Travis, Paul Blais, and John Parry. "Numerical basis and validation of CAD-centric CFD: Honeycomb heatsink study." In 2013 19th International Workshop on Thermal Investigations of ICs and Systems (THERMINIC). IEEE, 2013. http://dx.doi.org/10.1109/therminic.2013.6675222.

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Lee, Sing-Kwan, Hung-Pin Chien, and Hai Gu. "CFD Study of Deep Draft SemiSubmersible VIM." In Offshore Technology Conference-Asia. Offshore Technology Conference, 2014. http://dx.doi.org/10.4043/24766-ms.

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"A CFD calibration study for automatic shapes." In 25th Plasmadynamics and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-2607.

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Lietz, Robert, William Pien, and Stephen Remondi. "A CFD Validation Study for Automotive Aerodynamics." In SAE 2000 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-0129.

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Reports on the topic "CFD study"

1

Cook, Chris B., Marshall C. Richmond, and John A. Serkowski. The Dalles Dam, Columbia River: Spillway Improvement CFD Study. Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/969745.

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Bran Anleu, Gabriela A., Myra L. Blaylock, and Joseph William Pratt. Hydrogen Fueled Ferry Feasibility Study and CFD Modeling of Leak Scenarios. Office of Scientific and Technical Information (OSTI), July 2017. http://dx.doi.org/10.2172/1374254.

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Ameen, Muhsin M., and Sibendu Som. CFD Study of Impact of Part-to-Part Variations on Spark-Ignition Engine Charge Formation. Office of Scientific and Technical Information (OSTI), February 2019. http://dx.doi.org/10.2172/1496042.

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Singh, Rajesh K., Jie Bao, Chao Wang, and Zhijie Xu. Device-scale CFD study for mass transfer coefficient and effective mass transfer area in packed column. Office of Scientific and Technical Information (OSTI), October 2018. http://dx.doi.org/10.2172/1492447.

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JACKSON VL. COMPUTATIONAL FLUID DYNAMICS MODELING OF SCALED HANFORD DOUBLE SHELL TANK MIXING - CFD MODELING SENSITIVITY STUDY RESULTS. Office of Scientific and Technical Information (OSTI), August 2011. http://dx.doi.org/10.2172/1028214.

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Kitoh, Kozo, Akio Kita, Yoshihiro Fujiura, Susumu Kato, Kazuyuki Toda, Makoto Yamamoto, Nobuyuki Taniguchi, and Tim Walker. Study on the Underbody Flow of the Vehicle (CFD Analysis Via KEM/RSM for Simplified Underbody Configuration). Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0328.

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Kim, Minho, and Junghwan Lim. A Study on the Optimum Design of Pre-Heater System by Using CFD Analysis and Taguchi Method. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0330.

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Fu, Yucheng, Jie Bao, Chao Wang, Rajesh Singh, Zhijie Xu, and Grigorios Panagakos. CFD Study of Countercurrent Flow in Triply Periodic Minimal Surfaces with CO2BOL Solvent. Office of Scientific and Technical Information (OSTI), December 2019. http://dx.doi.org/10.2172/1691506.

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Duque, Earl, Steve Legensky, Brad Whitlock, David Rogers, Andrew Bauer, Scott Imlay, David Thompson, and Seiji Tsutsumi. Summary of the SciTech 2020 Technical Panel on In Situ/In Transit Computational Environments for Visualization and Data Analysis. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40887.

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At the AIAA SciTech 2020 conference, the Meshing, Visualization and Computational Environments Technical Committee hosted a special technical panel on In Situ/In Transit Computational Environments for Visualization and Data Analytics. The panel brought together leading experts from industry, software vendors, Department of Energy, Department of Defense and the Japan Aerospace Exploration Agency (JAXA). In situ and in transit methodologies enable Computational Fluid Dynamic (CFD) simulations to avoid the excessive overhead associated with data I/O at large scales especially as simulations scale to millions of processors. These methods either share the data analysis/visualization pipelines with the memory space of the solver or efficiently off load the workload to alternate processors. Using these methods, simulations can scale and have the promise of enabling the community to satisfy the Knowledge Extraction milestones as envisioned by the CFD Vision 2030 study for "on demand analysis/visualization of a 100 Billion point unsteady CFD simulation". This paper summarizes the presentations providing a discussion point of how the community can achieve the goals set forth in the CFD Vision 2030.
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Michalski, A,, D. Andersson, R. Rossi, and C. Soriano. D7.1 DELIVERY OF GEOMETRY AND COMPUTATIONAL MODEL. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.020.

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This document describes the industrial application, on which the developments of the project are implemented, and the CFD set-up. The developments are implemented over six analysis cases with increasing complexity starting from a 2D geometry with mean wind inflow to a 3D geometry with turbulent inflow and real-time shape optimization. The application represents the CAARC tall building model, which has served as a benchmark model for many studies since the 1970’s when it was first developed. Base moments (bending and torsional moments) of the building are extracted for validation by comparison of the results with the benchmark study. Page 3 of 19 Deliverable 7.1
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