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Letteratura scientifica selezionata sul tema "CFD"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 agosto 2024

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Articoli di riviste sul tema "CFD"

A., Aswandi, B. L. Syaefullah, D. A. Iyai e M. Jen Wajo. "UTILIZATION OF CARBOHYDRATE POTENTIAL IN VARIOUS KINDS OF BANANA COB FLOUR BANANA IN KACANG GOATS". IRAQI JOURNAL OF AGRICULTURAL SCIENCES 53, n. 4 (30 agosto 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 e Christopher P. Ames. "Optimal reconstruction technique after C-2 corpectomy and spondylectomy: a biomechanical analysis". Journal of Neurosurgery: Spine 12, n. 5 (maggio 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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YAMAMOTO, Satoru. "Paradigm Shift of CFD toward CFC". TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 77, n. 774 (2011): 195–204. http://dx.doi.org/10.1299/kikaib.77.195.

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Burger, C. J., S. J. van der Spuy e T. W. von Backström. "Design of a Compact Crossover Diffuser for Micro Gas Turbines Using a Mean-Line Code". International Journal of Turbo & Jet-Engines 36, n. 4 (18 novembre 2019): 347–57. http://dx.doi.org/10.1515/tjj-2017-0021.

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Abstract The design and validation of a Compact Crossover Diffuser (CCD) to replace the size-limited radial diffuser and axial de-swirl cascade of an existing Micro Gas Turbine (MGT) is discussed. A CCD strives to combine the performance of a channel diffuser with the operating range and efficiency of a vaneless diffuser. The development of a one-dimensional Mean-Line Code (MLC) is presented, which aids the designer in preliminary design and performance evaluation of the CCD. Design graphs indicating the performance effects of changing the primary design variables are developed and shown. The MLC is numerically validated using Computational Fluid Dynamics (CFD). Good agreement is seen between the MLC and CFD results, predicting the design point PRss(2-4) to within 1.4 %. A CFD optimized CCD was manufactured and tested. Agreement between the CFD and experimental results for PRts(0-4) is within 7.58 % at 106 kRPM. A numerically predicted increase in PRts(0-4) from 3.31, to 3.53, to 3.83 is seen for the vaneless-, MLC optimized-, and CFD optimized-design respectively. An experimental increase of 82.3 % in engine thrust and 80.0 % in total-to-static pressure recovery across the compressor stage was measured when retrofitting the BMT120KS with a new impeller and CCD.

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Agonafer, D., e A. Vimba. "Solid Model Based Preprocessor to CFD Code for Applications to Electronic Cooling Systems". Journal of Electronic Packaging 119, n. 2 (1 giugno 1997): 138–43. http://dx.doi.org/10.1115/1.2792220.

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The use of a solid model based Computer Aided Design (CAD) tool as a preprocessor to a finite control-volume based Computational Fluid Dynamics (CFD) code is presented. Preprocessing includes geometry description, grid generation, definition of material properties, application of boundary conditions, and definition of solution control parameters. The CAD based preprocessor, as opposed to traditional finite control-volume preprocessors, provides the above capabilities in a powerful graphic environment. Using a solid model based CAD tool, work is reduced, and visualization is enhanced employing the capabilities of the three-dimensional solid modeler. In addition, a technique which categorizes control volumes into groups comprising the solid and fluid portions of the problem domain is presented. At the completion of preprocessing, a model appropriate as input to a CFD code is generated. This model is then solved using the CFD program. The process is shown in a tutorial form by considering a two-dimensional turbulent flow problem in an electronic card on board package. Although the methodology shown in this paper focuses on specific CFD and Solid Model programs, the concept can readily be applied to other CFD and/or Solid Model programs.

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Perić, M. "Simulation of Flows in Complex Geometries: New Meshing and Solution Methods". NAFEMS International Journal of CFD Case Studies 6 (marzo 2007): 27–37. http://dx.doi.org/10.59972/utux3hbg.

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The use of CFD is spreading in all areas of engineering. The flow domains are usually very complicated, which places high demands on both meshing and solution methods. In this manuscript the newest developments in the handling of complex geometries in CFD are presented. The limitations with respect to the shape of control volumes that may appear in a numerical grid are lifted: cells of arbitrary polyhedral shape are allowed. CAD-integration of all CFD tools and automatic generation of polyhedral meshes, as well as a solution method that can use such meshes, are also presented and the advantages of the new technology are discussed. The emphasis is on CAD integration, automatic mesh generation, and optimisation of mesh quality. The aim of all of these measures is the shortening of analysis time in all phases of a CFD simulation and at the same time an improvement of solution quality.

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Cui, Hong Jiang, Ming Hai Li e Ying Guan. "The Performance Simulation and Optimization Research on Intake Port of Locomotive Diesel Engine". Advanced Materials Research 443-444 (gennaio 2012): 1007–13. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.1007.

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.In order to manufacture high quality intake port with bigger discharge coefficient and appropriate swirl ratio for diesel engine performance improvement, intake port tests and CFD simulation method were combined together to optimize its structure. The three-dimensional CAD model of intake port was built and was putted into AVL–FIRE platform to do CFD simulation with appropriate turbulence model and calculation method. The detailed air flow information was obtained by CFD simulation. After analyzing, two optimization programs were discussed. This research shows that CFD simulation is a powerful method to design diesel engine intake port; air flow condition is complex in the intake port; intake port structure optimization can increase the discharge coefficient and improve the air flow condition.

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Rachmanu, Fatkur. "DESAIN ULANG IMPELER POMPA SENTRIFUGAL KURVA PRESTASI SERTA FENOMENA ALIRAN DENGAN CAD-CFD". Simetris : Jurnal Teknik Mesin, Elektro dan Ilmu Komputer 7, n. 2 (1 novembre 2016): 649. http://dx.doi.org/10.24176/simet.v7i2.777.

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Pompa adalah alat untuk memindahkan cairan dari dataran rendah ke dataran tinggi. Pengoperasiannya bila lama digunakan akan mengurangi efisiensi dari prestasi pompa tersebut sehingga diperlukan perbaikan dan perawatan. Salah satu perawatannya antara lain dengan memperbaiki komponen utamanya yaitu impeler atau baling-baling. Pada pembuatan impeler tahap pertama adalah desain bentuk impeler dengan memperhatikan beberapa parameter sehingga meningkatan efisiensi pompa. Tujuan penelitian ini adalah untuk mengubah profil impeler agar efisiensi meningkat dan mendapatkan impeler yang lebih efektif dengan bantuan perangkat lunak CAD dan CFD. CFD adalah metode penghitungan, memprediksi, dan pendekatan aliran fluida secara numerik dengan bantuan komputer. CAD mengubah dari model umum menjadi model berdimensi, lalu pendiskritan model dalam CFD sebagai pendekatan dari aliran fluida air yang terjadi pada impeler. Hasil optimalisasi dengan perangkat lunak efisiensi total kinerja pompa meningkat dari 59 % menjadi 61%. Sudut masuk fluida pada sudut masuk sudu impeler (?1) dan sudut keluar sudu impeler (?2) diusahakan diatas 10o, disamping nilai NPSHR menentukan pelayanan kondisi kerja pompa dalam kewajaran. Sudut incident (i) dapat mengubah kinerja pompa. Sesuai hukum pompa sentrifugal yaitu kecepatan isap spesifik (Nss) yang meningkat akan menurunkan tinggi kenaikan isap positif bersih yang diperlukan (NPSHR). Sehingga didapat model impeler yang lebih optimal. Kata kunci: desain, impeler, pompa, sentrifugal, CAD, CFD.

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Xu, Qing, Yu-Xing Li, Xiao-Ning Li, Jia-Bin Wang, Fan Yang, Yi Yang e Tian-Ling Ren. "Simulation of SiO2 etching in an inductively coupled CF4 plasma". Modern Physics Letters B 31, n. 06 (28 febbraio 2017): 1750042. http://dx.doi.org/10.1142/s0217984917500427.

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Plasma etching technology is an indispensable processing method in the manufacturing process of semiconductor devices. Because of the high fluorine/carbon ratio of CF4, the CF4 gas is often used for etching SiO2. A commercial software ESI-CFD is used to simulate the process of plasma etching with an inductively coupled plasma model. For the simulation part, CFD-ACE is used to simulate the chamber, and CFD-TOPO is used to simulate the surface of the sample. The effects of chamber pressure, bias voltage and ICP power on the reactant particles were investigated, and the etching profiles of SiO2 were obtained. Simulation can be used to predict the effects of reaction conditions on the density, energy and angular distributions of reactant particles, which can play a good role in guiding the etching process.

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Wang, Chenye, Caifei Ding, Zhoujia Hua, Chunyue Chen e 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 (24 novembre 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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Più fonti

Tesi sul tema "CFD"

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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King, Matthew Lee. "A CAD-centric Approach to CFD Analysis With Discrete Features". Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd570.pdf.

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Du, Jianyi. "Combustion CFD simulation". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0018/NQ56437.pdf.

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Gilani, Mohammad Nejad Hamzeei. "CFD of droplet entrainment". Thesis, Imperial College London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542939.

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Heinz, Matthias. "CFD- Berechnung von Axialkolbenpumpen". Technische Universität Chemnitz, 2019. https://monarch.qucosa.de/id/qucosa%3A34344.

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Axialkolbenpumpen bieten eine hohe Leistungsdichten und einfache Regelbarkeit. Allerdings neigen sie zu Kavitation, mit der Gefahr der Beschädigung und erhöhter Geräuschbildung durch Druckpulsationen. Die numerische Strömungssimulation bietet die Möglichkeit, die transienten Prozesse innerhalb dieser Pumpen zu verstehen und Optimierungsmöglichkeiten aufzuzeigen. Die komplexe Bewegung der Kolben erfordert bewegte Gitter, die translatorische und rotatorische Bewegungen sehr genau abbilden müssen. Die zu fördernde Hydraulikflüssigkeit muss als kompressibles Medium behandelt werden, insbesondere da sie zu bestimmten Zeiten (Kompressions- und Dekompressionsphase) in geschlossen Kammern einer Volumenänderung unterworfen ist, die eine Dichte- und Druckänderung mit sich bringt. Im Falle des Auftretens von Kavitation ist eine Modellierung der gasförmigen und flüssigen Phase notwendig. Der Vortrag zeigt auf, wie das vollständige transiente Verhalten von Axialkolbenpumpen simuliert werden kann. Dadurch ist es möglich, Steuerzeitenoptimierungen durchzuführen, die zu geringerer Kavitationsneigung und reduzierten Druckpulsationen führen.

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Svedjeland, Magnus. "CFD-simulering av luft- och temperaturflöde i ett apparatskåp". Thesis, University West, Department of Technology, Mathematics and Computer Science, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-756.

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Zaffagnini, Alberto. "Modellazione CFD di manufatti idraulici". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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Abstract (sommario):

Nel presente lavoro di tesi vengono studiati, per mezzo di simulazioni numeriche di fluidodinamica computazionale, diversi manufatti idraulici, partendo da casi più semplici la cui trattazione teorica e sperimentale è ampiamente conosciuta, come flusso attraverso una soglia e moto uniforme in canale rettangolare, fino a casi complessi di cui non esistono formulazioni teoriche ma solo sperimentali come pozzetti di salto cilindrici. In particolare, come caso conclusivo, si studia il comportamento di un manufatto ripartitore realmente esistente in un impianto di trattamento delle acque reflue.

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Nøttveit, Erlend. "Numerisk analyse (CFD) av stempelpumpe". Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10575.

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I denne oppgåva er det sett nærare på lekkasjar i stempelpumper. I starten presenterast den nødvendige teorien for CFD, pumper og spalter. Ein definerer deformasjons-lekkasje/trykk-lekkasje som eit forhold. Berekningar blir gjort på bakgrunn av teorien slik at ein konkret kan talfesta dette forholdet. Etter dette blir simuleringane som er utført presangtert og diskutert. Den første simuleringa er for ein enkel sylinder utan veggar. Det er med andre ord berre veskevolumet som er med. Denne modellen er brukt til å lære teknikken for deforming mesh. Dette er ein teknikk som er nødvendig for å kunne ha forandring av veskevolumet sin geometri i løpet av simuleringa. Den neste simuleringa er eigentlig ein vidareføring av den første. Hovudskilnaden er at her er det tatt med ein vegg som representerer spalta mellom stempelet og sylinderveggen. Spalta i modellen er mykje større ein kva den er i røynda. I modellen ser den meir ut som ein sylinder enn ei spalte. Innerveggen av spalta er ein open vegg frå sylinderen sitt veskevolum og inn i spalta, medan ytterveggen er ein tett vegg. Dette gjer at veska har høve til å lekke gjennom spalta og ut på endane. Det er lagt inn porøsitet i spalta som skapar strøymingsmotstand som om det var ei lita spalte. Denne modellen blei kjørt fleire gongar for å få den rette verdien på strøymingsmotstanden. Då verdien for porøsitet var på plass, blei det laga ein modell med sju sylindrar. Toppen av sylindrane ligg inn mot ei spalte. Denne spalta er mellom sylinderblokka og ventilplata. Sidan det er sju stempel i denne modellen og ikkje eit som i dei føregåande, er det brukt UDFer (User-Defined Function) for å styre stempela sin aksialrørsle som er faseforskyvd i forhold til kvarandre. Også denne modellen blir kjørt fleire gongar og det blir utvikla spissar på avslutningane av opningane i ventilplata. Resultata for kjøringar med og utan spiss blir samanlikna og diskutert. I denne modellen er det ikkje med noko inn- og utløpsprofil, så endå ein modell er utvikla der det er med ein geometri også for inn- og utløp. Denne modellen får dermed ein 3d form på avslutninga av opningane i ventilplata. I tillegg er den modellen forsøkt gjort meir korrekt i overgang mellom sylindrane og ventilplate. Sjølv i desse enkle modellane med forenkla spalter finn ein at celletalet i spaltene utgjer ein signifikant del av cellene i modellen.

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Vangbo, Petter Olav. "CFD in conceptual ship design". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15480.

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Computational Fluid Dynamics (CFD) has been around for many years. It is a computer tool that can be used to find the hydrodynamic fluid performances. In ship design it is used in a wide area from smoke propagation to resistance estimations. It is however in resistance estimations that CFD have had most focus and research. There are many tools a designer can make use of nowadays. Most of the tools are computer based. This is optimization algorithms, computer aided design (CAD) and computational fluid dynamics (CFD). Using the tools should shorten the time of ship design and make better solutions. I have used a computer tool that mixes optimization with model variation (CAD) and verification (CFD). My conclusion is that it is a powerful tool to use, but should be handled with care. Few variables in the optimization process are important. Conceptual design methodology could be broken down to two outer ranges; point based design and set based design. The methods are quite different when approaching a complex design problem. There seems to be some favor in set based design when coming to a global ‘optimized’ solution to the design problem. More knowledge is gathered in set based design before deciding the final requirements and parameters. This is especially in new developing design where little knowledge is produced in the past. CFD is a broad term. There is many different methods and area of use. In this thesis I will break it down to two terms; potential codes and RANSE codes. Potential codes are easy, robust and well developed. RANSE codes are difficult, takes a lot of time and not so well developed. Potential codes are used in areas where turbulent flows are not present, while RANSE codes are used when it is present and important to the result. If designing new innovative hulls CFD should be used earlier in the design process and with a simulation driven design approach. Simulation driven design could be used with potential codes or RANSE codes. To have a high value rate of the modeling potential codes should be used when many sets of variation I needed and turbulence is not important to the answers. RANSE code should be used when turbulent flow is important to the answer, but must be done with few sets of variations because of high computational effort. If designing a more standard ship, CFD should be used in a modeling design approach to verify the performance estimations that have been done earlier in the process.

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Erlandsson, Johan, e Patrik Berg. "Analys av turbulensmodeller för CFD". Thesis, Uppsala universitet, Kärnfysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-161110.

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This thesis has been a part of Forsmarks Kraftgrupp AB's evaluation of a turbulence model used in simulation of turbulent flow called PRNS (Partially Resolved Numerical Simulation). This model has promising properties and may be of use in saving computational resources. The purpose of this thesis was to analyze this model and compare it with industrially applied models such as k-omega SST and LES (Large Eddy Simulations). PRNS works as a hybrid of the k-omega SST and DNS (Direct Numerical Simulation) where a constant, RCP (Resolution Control Parameter) with a value between 0 and 1 are selected. This constant is then used in the calculations and determines the behavior of the simulation. When RCP is set to zero the equation are the same as for a DNS simulation and when RCP is set to one the equations for k-omega SST is solved. In this report four different PRNS models have been used, three where RCP was given a constant value (0.1, 0.4 and 0.6). In the fourth model RCP is calculated from the flow field variables The models have been compared to an experiment from 2008 and simulations have been made to resemble the experiment. In the experiment a Particle Image Velocimeter (PIV) was used as method of measurement. From the experimental report data such as velocity (U), turbulent kinetic energy (k) and standard deviation (URMS) have been obtained and have formed the basis for comparison. The models have been simulated in two different software programs: OpenFOAM and Fluent. The data have thereafter been post processed in the software programs MatLab and ParaView, to be compared with experimental data. The results of the simulations have shown that PRNS models generally show a good accordance with experimental data. In particular, PRNS models with constant RCP have shown good results, however, there are some discrepancies. The PRNS model with varying RCP has in most cases showed the largest deviation from experimental data but also a deviation from the other models, including the reference models. Due to the design of the mesh (coarse) further evaluation of the PRNS models will be needed. First, simulate with a finer mesh, but also more complex geometries should be simulated in order to sort out PRNS strengths and weaknesses and thus determine if the model can be used in the daily work at Forsmarks Kraftgrupp AB.

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Libri sul tema "CFD"

Schwarze, Rüdiger. CFD-Modellierung. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-24378-3.

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Inc, Adams Golf, a cura di. Adams Golf tees off with integrated CAD and CFD. [New York]: Knovel, 2011.

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Norouzi, Hamid Reza, Reza Zarghami, Rahmat Sotudeh-Gharebagh e Navid Mostoufi. Coupled CFD-DEM Modeling. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119005315.

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Wilcox, David C. Turbulence modeling for CFD. La Cãnada, CA: DCW Industries, Inc., 1993.

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Wilcox, David C. Turbulence modeling for CFD. 2^a ed. La Cãnada, Calif: DCW Industries, 1998.

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Advisory Group for Aerospace Research and Development. Consultant and Exchange Programme. e Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel., a cura di. Turbomachinery design using CFD. Neuilly sur Seine: Agard, 1994.

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L, Streett Craig, Hussaini M. Yousuff e Langley Research Center, a cura di. Spectral methods for CFD. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1989.

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Center, Lewis Research, a cura di. CFD for hypersonic propulsion. [Cleveland, Ohio: Lewis Research Center, 1991.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Turbomachinery design using CFD. Neuilly sur Seine, France: AGARD, 1994.

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Wilcox, David C. Turbulence modeling for CFD. La Cañada, CA: DCW Industries, 1994.

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Capitoli di libri sul tema "CFD"

Zhai, Zhiqiang. "Introduce CFD". In Computational Fluid Dynamics for Built and Natural Environments, 1–25. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9820-0_1.

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Schwarze, Rüdiger. "Computational Fluid Dynamics". In CFD-Modellierung, 3–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24378-3_1.

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Schwarze, Rüdiger. "Rechengitter". In CFD-Modellierung, 23–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24378-3_2.

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Schwarze, Rüdiger. "Mathematische Modelle einer Strömung". In CFD-Modellierung, 53–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24378-3_3.

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Schwarze, Rüdiger. "Numerische Methoden". In CFD-Modellierung, 59–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24378-3_4.

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Schwarze, Rüdiger. "Newtonsche Strömungen". In CFD-Modellierung, 109–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24378-3_5.

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Schwarze, Rüdiger. "Turbulente Strömungen". In CFD-Modellierung, 129–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24378-3_6.

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Schwarze, Rüdiger. "Anwendungen". In CFD-Modellierung, 181–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24378-3_7.

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Bedford, Donald. "CFD or not CFD? That is the Question". In Waves and Particles in Light and Matter, 473–76. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2550-9_40.

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Campelo, Hugo. "CFD Scale Model". In Springer Theses, 65–90. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72703-5_3.

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Atti di convegni sul tema "CFD"

Fujii, K., e K. Miyaji. "WEB-CFD and beyond - CFD for non-CFD researchers". In 40th AIAA Aerospace Sciences Meeting & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-753.

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Bull, Peter. "Validation of CFD For High Reynolds Number Ship Flows". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.9.

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Coirier, W., S. Kim e M. Showalter. "Fish-Like Locomotion: A CFD Simulation of Mit’s Robotuna". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.16.

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Salui, K. B., e D. Vassalos. "A Rans Based Technique To Compute Forced Rolling RespOnses In". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.3.

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Seil, Gregory, J. Lundberg e G. Petersson. "CFD Calculation and Experimental Validation of A Kamewa Highskew". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.14.

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Iversen, Ivar. "Validation of Simulating Sloshing With CFD". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.17.

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Bertram, Volker, Mario Caponetto e Oud El Moctar. "Ranse Simulations For Unsteady Marine Two-Phase Flows". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.10.

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Guilbaud, M., J.-P. Boin e M. Ba. "Linearised Free Surface Flow Calculations By A Panel Method Using". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.12.

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Pattenden, R. J., S. R. Turnock e N. W. Bressloff. "Developments In The Use of Large-Eddy Simulation For Ship". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.11.

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Ostman, A., e I. J. Oye. "Rans Solver Applied For Hydrodynamic Analysis of Twin-Hull Ferry". In CFD 2003: CFD Technology In Ship Hydrodynamics. RINA, 2003. http://dx.doi.org/10.3940/rina.cfd.2003.8.

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Rapporti di organizzazioni sul tema "CFD"

Apostolatos, A., R. Rossi e C. Soriano. D7.2 Finalization of "deterministic" verification and validation tests. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.006.

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This deliverable focus on the verification and validation of the solvers of Kratos Multiphysics which are used within ExaQUte. These solvers comprise standard body-fitted approaches and novel embedded approaches for the Computational Fluid Dynamics (CFD) simulations carried out within ExaQUte. Firstly, the standard body-fitted CFD solver is validated on a benchmark problem of high rise building - CAARC benchmark and subsequently the novel embedded CFD solver is verified against the solution of the body-fitted solver. Especially for the novel embedded approach, a workflow is presented on which the exact parameterized Computer-Aided Design (CAD) model is used in an efficient manner for the underlying CFD simulations. It includes: A note on the space-time methods Verification results for the body-fitted solver based on the CAARC benchmark Workflow consisting of importing an exact CAD model, tessellating it and performing embedded CFD on it Verification results for the embedded solver based on a high-rise building API definition and usage

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Bhardwaj, M. K., R. K. Kapania, E. Reichenbach e G. P. Guruswamy. A CFD/CSD interaction methodology for aircraft wings. Office of Scientific and Technical Information (OSTI), gennaio 1998. http://dx.doi.org/10.2172/658442.

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Lee, S. SDI CFD MODELING ANALYSIS. Office of Scientific and Technical Information (OSTI), maggio 2011. http://dx.doi.org/10.2172/1014152.

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Lee, S. TANK48 CFD MODELING ANALYSIS. Office of Scientific and Technical Information (OSTI), maggio 2011. http://dx.doi.org/10.2172/1016386.

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Garretson, Dan, Hans Mair, Christopher Martin, Kay Sullivan e Jeremy Teichman. Review of CFD Capabilities. Fort Belvoir, VA: Defense Technical Information Center, settembre 2005. http://dx.doi.org/10.21236/ada537587.

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Chatagny, Laurent. PR-471-16206-R02 Suction Piping Effect on Pump Performance CFD. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), marzo 2019. http://dx.doi.org/10.55274/r0011562.

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CFD simulations of pump suction piping coupled to a double suction volute pump were performed with oil at a viscosity of ~90 cSt. Two variants of the suction piping were modeled in order to investigate their effect on the pump performance. Measurement data obtained during PRCI project CPR-15A were used to validate the CFD setup. The CFD results were mostly in line with the measurements, in particular performance and pressure tap values in the suction piping. The pump rotor forces predicted by CFD however showed significant differences to the measured values. The CFD setup presented in this report provides a basis framework for further CFD investigations. This work will benefit the liquids pipeline station designers and operators and also CFD analysts by providing CFD comparisons to benchmark measurements.

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Tzanos, C. P. Status report : guard containment CFD analysis. Office of Scientific and Technical Information (OSTI), marzo 2006. http://dx.doi.org/10.2172/924681.

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Stern, Fred, Robert V. Wilson, Hugh W. Coleman e Eric G. Paterson. Verification and Validation of CFD Simulations. Fort Belvoir, VA: Defense Technical Information Center, settembre 1999. http://dx.doi.org/10.21236/ada458015.

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Carle, A., L. L. Green, P. A. Newman e C. H. Bischof. Applications of automatic differentiation in CFD. Office of Scientific and Technical Information (OSTI), giugno 1994. http://dx.doi.org/10.2172/10159232.

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Richard W. Johnson, Hiroyuki Sato e Richard R. Schultz. CFD Analysis of Core Bypass Phenomena. Office of Scientific and Technical Information (OSTI), novembre 2009. http://dx.doi.org/10.2172/974775.

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