Littérature scientifique sur le sujet « CFD experimental »

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Articles de revues sur le sujet "CFD experimental"

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Burger, C. J., S. J. van der Spuy et 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, no 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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Minson, A. J., C. J. Wood et R. E. Belcher. « Experimental velocity measurements for CFD validation ». Journal of Wind Engineering and Industrial Aerodynamics 58, no 3 (décembre 1995) : 205–15. http://dx.doi.org/10.1016/0167-6105(95)00025-9.

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Leishear, Robert A. « CFD & ; Safety Factors ». Mechanical Engineering 135, no 02 (1 février 2013) : 30–35. http://dx.doi.org/10.1115/1.2013-feb-3.

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This article presents a research that demonstrates the need for experimental validation of computational fluid dynamics (CFD) models for complex processes, such as blending. An additional result of the study is that it provided researchers a better understanding of how to use CFD models in general. The principle for blending is the same for all blender-pump designs: the business end of a centrifugal pump will be submerged in the salt solutions in the tank. Lab researchers found that, although CFD provided good estimates of an average blending time, experimental blending times varied significantly from the average. The issue of experimental uncertainty is inherent in CFD modeling as well as in many empirical equations used for modeling and design methods. In order to bring all of this research together, the process variables investigated were the fluid velocities in the tanks and the times required to blend the fluids. The large scatter in experimental data shows that large errors can be obtained from CFD models in the absence of experimental correction factors.
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Mañes, Jorge Pérez, Victor Hugo Sánchez Espinoza, Sergio Chiva Vicent, Michael Böttcher et Robert Stieglitz. « Validation of NEPTUNE-CFD Two-Phase Flow Models Using Experimental Data ». Science and Technology of Nuclear Installations 2014 (2014) : 1–19. http://dx.doi.org/10.1155/2014/185950.

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This paper deals with the validation of the two-phase flow models of the CFD code NEPTUNEC-CFD using experimental data provided by the OECD BWR BFBT and PSBT Benchmark. Since the two-phase models of CFD codes are extensively being improved, the validation is a key step for the acceptability of such codes. The validation work is performed in the frame of the European NURISP Project and it was focused on the steady state and transient void fraction tests. The influence of different NEPTUNE-CFD model parameters on the void fraction prediction is investigated and discussed in detail. Due to the coupling of heat conduction solver SYRTHES with NEPTUNE-CFD, the description of the coupled fluid dynamics and heat transfer between the fuel rod and the fluid is improved significantly. The averaged void fraction predicted by NEPTUNE-CFD for selected PSBT and BFBT tests is in good agreement with the experimental data. Finally, areas for future improvements of the NEPTUNE-CFD code were identified, too.
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Ribeiro, J. A., A. S. Reis, P. S. Avendaño, C. H. Ataíde et Marcos A. S. Barrozo. « Experimental and CFD Simulation of a Bubble Column ». Materials Science Forum 727-728 (août 2012) : 1824–29. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1824.

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The numerical simulation in fluid mechanics has large application in chemical engineering. The objective of the present work is the analyze of a computational model for the fluid dynamics behaviour of a bubble column of the geometry cylindrical non regular with multiphase mixture. Experimental data and CFD results of the hydrodynamics of gaseous and liquid phases have been compared. Five different diameters of bubbles have been used in the CFD simulations. The comparisons between CFD simulations and experimental data show that the Eulerian-Eulerian approach provides a computational model that represents the process satisfactorily.
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ra, Jai Sagar, Nagalli Raghu, G. V. Dev. « Experimental Analysis on Catalytic Converter Using CFD ». International Journal of Innovative Research in Science, Engineering and Technology 04, no 07 (15 juillet 2015) : 5251–61. http://dx.doi.org/10.15680/ijirset.2015.0407029.

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WADA, Yasuhiro. « Validation of Hypervelocity CFD using Experimental Data. » Journal of the Japan Society for Aeronautical and Space Sciences 41, no 475 (1993) : 466–71. http://dx.doi.org/10.2322/jjsass1969.41.466.

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Jadhav, Ganesh K., P. M. Ghanegaonkar et Sharad Garg. « Experimental and CFD analysis of turbo ventilator ». Journal of Building Engineering 6 (juin 2016) : 196–202. http://dx.doi.org/10.1016/j.jobe.2016.04.001.

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Chen, Ming Zhou, et Qi Dou Zhou. « Numerical Simulation of Fluctuating Propeller Forces and Comparison with Experimental Data ». Applied Mechanics and Materials 105-107 (septembre 2011) : 518–22. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.518.

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Unsteady CFD method based on realizable k-ε model is used for predicting unsteady forces of propeller working in non-uniform wake. First, CFD computations with different mesh scales were conducted at the propeller design condition, the results show that mesh refinement changed the results little. Then unsteady CFD simulation with different time step intervals was conducted for determining suitable time step interval, the results show that it is suitable for propeller rotating 3° per step. Based on the chosen mesh and time step interval, unsteady CFD simulation of propeller P4118 was conducted in 3-cycle and 4-cycle inflow, the unsteady thrust, torque and horizontal force agree well with experimental data, the results show that CFD method has good accuracy in predicting unsteady propeller forces.
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Vasan, A. Mercy, N. Prasanna, M. Vivekanandan et V. Gopalakrishnan. « CFD investigation of the cold hydrodynamics of a laboratory scale CFB furnace ». JOURNAL OF ADVANCES IN CHEMISTRY 12, no 9 (2 novembre 2016) : 4330–40. http://dx.doi.org/10.24297/jac.v12i9.4092.

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This investigation presents a computational and experimental study of the flow characteristics of a laboratory scale CFB cold model riser. i) The first part of the work deals with 2D, CFD validation of a literature based CFB riser of circular cross section of 1m height. Simulation results showed good agreement with experimental literature data for radial profiles of volume fraction and particle velocity. ii) The second part is a work on simulation and experimental verification of a CFB riser flow characteristics of a CFB riser of rectangular cross section (400mm x 550mm x2000mm). An experimental run on the test rig was conducted for sand of 300 micron size at a fluidization velocity of 4 m/s and the fluidization behavior was captured on a high speed camera. For simulation, 3D, transient, Euler-ian approach combined with the Kinetic theory of Granular flow and Gidaspow drag model was used to describe the gas–particle behavior. A frame by frame visual comparison of instantaneous volume fraction distribution was made between camera images and 3D simulated profiles. A further graphical comparison between experimental literature data and simulated 3D profiles of volume fraction and particle velocity profiles yielded fairly good results. It was observed that, in spite of non inclusion of turbulence factor in the current 3D simulation, no significant influence was observed in the results
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Thèses sur le sujet "CFD experimental"

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Hardie, Staffan. « Drag Estimations on Experimental Aircraft Using CFD ». Thesis, Mälardalen University, Department of Mathematics and Physics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-334.

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The drag approximations done in the initial design phase needed to be verified. A model of the aircraft has been analyzed with CFD and results examined to see how accurate the estimations were. A step by step analysis was made and then a simulation was run. The drag results of the CFD analysis did not meet the goal of the initial design study. Several reasons for this are discussed. The analysis shows that the aircraft design works well aerodynamically but also shows a few areas where the design can be improved.


Det approximerade värdet på luftmotståndet som gjordes I den preliminära designfasen behövde verifieras. En flygplansmodell har analyserats med CFD och resultaten har undersökts för att se hur exakta antagandena var. En analys gjordes steg för steg och slutligen har en simulering utförts. Det uppmätta luftmotståndet motsvarade inte målet i den preliminära designfasen. Flera olika anledningar till detta diskuteras. Analysen visar att denna flygplansdesign fungerar bra aerodynamiskt men identifierar också en del punkter på vilken den kan förbättras.

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li, zhiliang. « EXPERIMENTAL AND CFD INVESTIGATIONS OF LIFTED TRIBRACHIAL FLAMES ». Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3048.

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Experimental measurements of the lift-off velocity and lift-off height, and numerical simulations were conducted on the liftoff and stabilization phenomena of laminar jet diffusion flames of inert-diluted C3H8 and CH4 fuels. Both non-reacting and reacting jets were investigated, including effects of multi-component diffusivities and heat release (buoyancy and gas expansion). The role of Schmidt number for non-reacting jets was investigated, with no conclusive Schmidt number criterion for liftoff previously known in similarity solutions. The cold-flow simulation for He-diluted CH4 fuel does not predict flame liftoff; however, adding heat release reaction leads to the prediction of liftoff, which is consistent with experimental observations. Including reaction was also found to improve liftoff height prediction for C3H8 flames, with the flame base location differing from that in the similarity solution - the intersection of the stoichiometric and iso-velocity contours is not necessary for flame stabilization (and thus lift-off). Possible mechanisms other than that proposed for similarity solution may better help to explain the stabilization and liftoff phenomena. The stretch rate at a wide range of isotherms near the base of the lifted tribrachial flame were also quantitatively plotted and analyzed.
Ph.D.
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering PhD
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Wang, Zhiguo. « Experimental studies and CFD simulations of conical spouted bed hydrodynamics ». Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/61.

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Conical spouted beds have been commonly used for drying suspensions, solutions and pasty materials. They can also be utilized in many other processes, such as catalytic partial oxidation of methane to synthesis gas, coating of tablets, coal gasification and liquefaction, pyrolysis of sawdust or mixtures of wood residues. The main objectives of this work include both the experimental research and mathematical modelling of the conical spouted bed hydrodynamics. For experimental research, pressure transducers and static pressure probes were applied to investigate the evolution of the internal spout and the local static pressure distribution; optical fibre probes were utilized to measure axial particle velocity profiles and voidage profiles; the step tracer injection technique using helium as the tracer and thermal conductivity cells as detectors was used to investigate the gas mixing behaviour inside a conical spouted bed. It was found that many factors might affect calibration of the effective distance of an optical fibre probe. Therefore, a new calibration setup was designed and assembled, and a comprehensive sensitivity analysis was conducted to calibrate the optical probes used in this study. For mathematical modelling, a stream-tube model based on the bed structure inside a conical spouted bed was proposed to simulate partial spouting states. By introducing an adjustable parameter, this model is capable of predicting the total pressure drop under different operating conditions, and estimating axial superficial gas velocity profiles and gauge pressure profiles. A mathematical model based on characteristics of conical spouted beds and the commercial software FLUENT was also developed and validated using measured experimental data. The proposed new CFD model can simulate both stable spouting and partial spouting states, with an adjustable solids-phase source term. At stable spouting states, simulation results agree very well with almost all experimental data, such as static pressure profiles, axial particle velocity profiles, voidage profiles etc. A comprehensive sensitivity analysis was also conducted to investigate the effect of all possible factors on simulation results, including the fluid inlet profile, solid bulk viscosity, frictional viscosity, restitution coefficient, exchange coefficient, and solid phase source term. The proposed new CFD model was also used successfully to simulate gas mixing behaviours inside a conical spouted bed, and simulate cylindrical packed beds as well as cylindrical fluidized beds in one code package.
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Supamusdisukul, Jirapat. « Experimental investigation of wing-fuselage integration geometries including CFD analyses ». College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8141.

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Thesis (M.S.) -- University of Maryland, College Park, 2008.
Thesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Prasser, Horst-Michael, Tobias Sühnel, Christophe Vallée et Thomas Höhne. « Experimental investigation and CFD simulation of slug flow in horizontal channels ». Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28061.

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For the investigation of stratified two-phase flow, two horizontal channels with rectangular cross-section were built at Forschungszentrum Dresden-Rossendorf (FZD). The channels allow the investigation of air/water co-current flows, especially the slug behaviour, at atmospheric pressure and room temperature. The test-sections are made of acrylic glass, so that optical techniques, like high-speed video observation or particle image velocimetry (PIV), can be applied for measurements. The rectangular cross-section was chosen to provide better observation possibilities. Moreover, dynamic pressure measurements were performed and synchronised with the high-speed camera system. CFD post-test simulations of stratified flows were performed using the code ANSYS CFX. The Euler-Euler two fluid model with the free surface option was applied on grids of minimum 4∙105 control volumes. The turbulence was modelled separately for each phase using the k-ω based shear stress transport (SST) turbulence model. The results compare well in terms of slug formation, velocity, and breaking. The qualitative agreement between calculation and experiment is encouraging and shows that CFD can be a useful tool in studying horizontal two-phase flow. Furthermore, CFD pre-test calculations were done to show the possibility of slug flow generation in a real geometry and at relevant parameters for nuclear reactor safety. The simulation was performed on a flat model representing the hot-leg of the German Konvoi-reactor, with water and saturated steam at 50 bar and 263.9°C. The results of the CFD-calculation show wave generation in the horizontal part of the hot-leg which grow to slugs in the region of the bend.
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Ebrahimi, Mohammadreza. « CFD-DEM modelling of two-phase pneumatic conveying with experimental validation ». Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9693.

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A wide range of industrial processes involve multiphase granular flows. These include catalytic reactions in fluidized beds, the pneumatic conveying of raw materials and gas-particle separators. Due to the complex nature of multiphase flows and the lack of fundamental understanding of the phenomena in a multiphase system, appropriate design and optimized operation of such systems has remained a challenging field of research. Design of these processes is hampered by difficulties in upscaling pilot scale results, the difficulties involved in experimental measurements and in finding reliable numerical modelling methods. Significant work has been carried out on numerical modelling of multiphase systems but challenges remain, notably computational time, appropriate definition of boundary conditions, relative significance of effects such as lift and turbulence and the availability of reliable model validation. The work presented in this thesis encompasses experimental and numerical investigations of horizontal pneumatic conveying. In the experimental work, carefully controlled experiments were carried out in a 6.5 m long, 0.075 m diameter horizontal conveying line with the aid of the laser Doppler anemometry (LDA). Initially, LDA measurements were performed to measure the gas velocity in clear flow. Good agreement was observed between the theory and experimental measurements. For two-phase experiments, spherical and non-spherical particles with different sizes and densities were used to study the effect of particle size and solid loading ratio on the mean axial particle velocity. Three different sizes of spherical glass beads, ranging from 0.9 mm to 2 mm and cylindrical shaped particle of size 1x1.5 mm were employed. It was found that by increasing the particle size and solid loading ratios, the mean axial particle velocity decreased. Turbulence modulation of the carrier phase due to the presence of spherical particles was also investigated by measuring fluctuating gas velocity for clear gas flow and particle laden flow with different particle sizes and solid loading ratios. Results suggested that for the size ranges of particles tested, the level of gas turbulence intensity increased significantly by adding particles, and the higher the solid loading ratio, the higher the turbulence intensity. With the rapid advancement of computer resources and hardware, it is now possible to perform simulations for multiphase flows. For a fundamental understanding of the underlying phenomena in pneumatic conveying, the coupled Reynolds averaged Navier-Stokes and discrete element method (RANS-DEM) was selected. The aim of the modelling section of this study was to evaluate the abilities of coupled RANSDEM to predict the phenomena occurring in a research-sized pneumatic conveying line. Simulations for both one-way and two-way RANS-DEM coupling were performed using the commercial coupled software FLUENT-EDEM in an Eulerian- Lagrangian framework, where the gas is simulated as a continuum medium, while solid phase is treated as a discrete phase. In one-way coupling simulations, a considerable discrepancy in mean axial particle velocity was observed compared to the experimental results, meaning two-way coupling was required. It was further found that the inclusion of Magnus lift force due to particle rotation was essential to reproduce the general behaviour observed in the experiments. Turbulence modulation also was investigated numerically. Experimental and simulation results of gas and particle velocities were compared showing that the RANS-DEM method is a promising method to simulate pneumatic conveying. However, some discrepancy between simulation and experimental results was observed. Most studies in two-phase flow fields have focused on spherical particles. However the majority of particles encountered in industry involve non-spherical granules which show considerably different transportation behaviour compared with spherical particles. Further modelling of cylindrical particles was conducted using a multisphere model to represent cylindrical particles in the DEM code. Drag and lift forces and torque equations were modified in the code to take the effect of particle orientation into account. The framework developed was evaluated for two test cases, indicating a good agreement with the analytical and experimental results. The transportation of isometric (low-aspect-ratio) non-spherical particles in pneumatic conveying was also modelled. The simulation results of mean axial particle velocity agreed well with the experimental measurements with the LDA technique.
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Prasser, Horst-Michael, Tobias Sühnel, Christophe Vallée et Thomas Höhne. « Experimental investigation and CFD simulation of slug flow in horizontal channels ». Forschungszentrum Dresden-Rossendorf, 2007. https://hzdr.qucosa.de/id/qucosa%3A21634.

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For the investigation of stratified two-phase flow, two horizontal channels with rectangular cross-section were built at Forschungszentrum Dresden-Rossendorf (FZD). The channels allow the investigation of air/water co-current flows, especially the slug behaviour, at atmospheric pressure and room temperature. The test-sections are made of acrylic glass, so that optical techniques, like high-speed video observation or particle image velocimetry (PIV), can be applied for measurements. The rectangular cross-section was chosen to provide better observation possibilities. Moreover, dynamic pressure measurements were performed and synchronised with the high-speed camera system. CFD post-test simulations of stratified flows were performed using the code ANSYS CFX. The Euler-Euler two fluid model with the free surface option was applied on grids of minimum 4∙105 control volumes. The turbulence was modelled separately for each phase using the k-ω based shear stress transport (SST) turbulence model. The results compare well in terms of slug formation, velocity, and breaking. The qualitative agreement between calculation and experiment is encouraging and shows that CFD can be a useful tool in studying horizontal two-phase flow. Furthermore, CFD pre-test calculations were done to show the possibility of slug flow generation in a real geometry and at relevant parameters for nuclear reactor safety. The simulation was performed on a flat model representing the hot-leg of the German Konvoi-reactor, with water and saturated steam at 50 bar and 263.9°C. The results of the CFD-calculation show wave generation in the horizontal part of the hot-leg which grow to slugs in the region of the bend.
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Semenzin, Clayton S. « Determination of Centrifugal Blood Pump Characteristics using CFD and Experimental Analysis ». Thesis, Griffith University, 2021. http://hdl.handle.net/10072/401348.

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Background Cardiovascular diseases are the leading cause of death throughout the developed world, attributed to approximately 17.8 million deaths worldwide in 2017 with increasing prevalence due to the aging population. Cardiovascular diseases generally result in heart failure. While the best treatment option for heart failure patients is heart transplantation, there is a severe deficiency in the availability of donor hearts. Rotary Blood Pumps (RBPs) utilised as Ventricular Assist Devices (VADs) provide an alternative treatment option. These devices are small implantable pumps that support the failing heart by providing power to augment circulation. The development of RBPs generally begins with initial designs obtained using traditional pump design methods (such as that developed by Stepanoff). However, studies have shown that this approach produces RBP prototypes far from optimal in design. Traditional theory relies on design constants derived empirically for large industrial pumps and these do not scale down well when applied to the much smaller RBPs. The initial designs are therefore generally quite poor and require an iterative build-and-test approach to obtain suitable pump prototypes – a process that is expensive and time consuming. Therefore, by improving the methodology for obtaining initial designs to better reflect the final product, development time can be greatly reduced. A popular avenue for analysing the effect of design variations and to further develop early prototypes of RBPs is to employ Computational Fluid Dynamics (CFD) simulations. These numerical simulations provide detailed data regarding the flow fields within these devices. However, a range of simulation options is available, leading to a wide range of potential predictions. In an attempt to provide a benchmark case, the FDA presented a challenge in which a pump design and test conditions were defined, allowing for direct comparison amongst different simulation approaches from a number of labs/RBP developers. The purpose of this thesis was to produce a gross design tool to provide a good starting point in RBP prototyping and a CFD simulation approach for verification that can also be used as a design refinement tool. Methods Formulating a design method for pumps requires the generation of empirical data. A number of pump design variables was identified as having an impact on pump performance, and a large number of experimental tests would have been needed to test the influence of each. Instead, a Design of Experiments (DOE) was utilised to streamline the process. The DOE outputs a relatively small number of tests required to fit a statistical model. Each design specified by the DOE was examined experimentally using a custom-built automated pump test platform to generate a number of performance measures. The obtained results were used to formulate a Response Surface Method (RSM) statistical model that showed acceptable fit to the input data. Coupled with desirability functions, the RSM model allowed for design optimisation. This tool essentially replaces Stepanoff’s traditional design methodology. The RSM model provides a robust tool that allows the user flexibility in design optimisation goals. The FDA pump was investigated in this thesis and a wide variety of simulation approaches was examined to determine which was most accurate. A range of factors were considered which included: mesh density, interface position between the rotating and stationary zones, steady vs. transient simulations, discretisation schemes, time step size and choice of turbulence model. The most appropriate option from each investigative study was selected to determine a recommended simulation approach. Final simulations were performed using these recommendations and were compared to the FDA experimental results to confirm the suitability of the suggested settings. Determination of Centrifugal Blood Pump Characteristics using CFD and Experimental Analysis iii The statistical model developed was used to design two different impellers as validation test cases. The first impeller was designed to optimise the maximum efficiency, P – Q curve slope and efficiency consistency. The second impeller was designed to mimic the approach used in traditional design methods for RBPs in setting a target design point as the primary objective and the aforementioned factors (from the first impeller) as secondary objectives. These two case studies underwent statistical performance predictions, CFD simulations, PIV analysis and experimental hydraulic testing to validate the statistical and CFD models. Results From the initial CFD study, a hybrid SBES turbulence model with full transient simulation on a fine grid with small time steps proved to be the most suitable both in terms of pressure rise generated by the FDA pump and resulting velocity fields when compared to published experimental results. From these findings the CFD modelling strategy was established. CFD results for the two validation pumps showed pressure rises matching the experimental data (8% and 1% difference for each impeller) within an acceptable range (<10% from the mean). The simulated velocity fields also closely replicated the PIV data for the majority of the flow domain. The statistical performance predictions well reflected those measured experimentally with the majority of data points falling within its confidence intervals. The hydraulic results also supported the main goal of this thesis, whereby an impeller generated using the statistical model, operated far closer to the target design point than that of a blood pump designed following Stepanoff’s methodology. Overall, both the statistical model and CFD approach provided accurate predictions and the purpose of the thesis was achieved. Final Remarks The statistical and CFD models developed in this thesis yield an effective design tool and verification methodology and show improvement over the current traditional design methods and accuracy in simulated results. Ultimately, the utilisation of these tools will lead to a reduction in the development time for new RBPs and provide a good understanding of the flow dynamics within these pumps, leading to improved pump designs reaching patients sooner. These tools are readily generalizable and could be adopted as design tools now.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
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Naronikar, Aditya, et Anton Riström. « CFD and Experimental Study of Refuelling and Venting a Fuel System ». Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-159297.

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In 1999, California Air Resources Board (CARB) implemented a regulation that required all gasoline cars sold in California be fitted with an Onboard Refueling Vapor Recovery System (ORVR). The ORVR system is designed to prevent Volatile Organic Compounds (VOCs) from escaping into the atmosphere during refuelling by storing the gas vapours in a carbon canister. Due to the complex nature of the fuel system, making design changes could have large implications on the ORVR performance of the vehicle. It is therefore desirable to develop a CFD model that can predict the effects of design changes, thereby reducing the need to perform physical tests on each design iteration. This master thesis project was performed at the Fuel Systems department at Volvo Cars in order to help reduce project lead times and product development costs by incorporating CFD as a part of the fuel system development cycle. The CFD results obtained were validated through experimental tests that were also performed as part of this project. In this master thesis project, a CFD model was developed to simulate the refuelling of gasoline for a California specification Volvo XC90 with an OPW-11B pump pistol. The model was set up in STAR-CCM+ using the Eulerian Volume of Fluid model for multiphase flow, the RANS realizable k-epsilon turbulence model and the two layer all y+ wall treatment. The effects of the carbon canister were modelled as a porous baffle interface in the simulations where viscous and inertial resistances of the porous media were adjusted to obtain a desired pressure drop across the canister. This method proved to be a suitable simplification for this study. The effects of evaporation as well as a chemical adsorption model for the carbon canister have been excluded from the project due to time limitations. It was found that the CFD simulations were in good agreement with the experimental results, especially with respect to capturing the overall behaviour of the fuel system during refuelling. It was found that resolving the flow spatially (and temporally) in the filler pipe was a crucial part in ensuring solver stability. A pressure difference between experiment and simulation was also observed as a consequence of excluding evaporation from the CFD model. After the CFD model had been verified and validated, changes to different parts of the fuel system were investigated to observe their effects on ORVR performance. These included changing the recirculation line diameter, changing the carbon canister properties and changing the angle of how the pump pistol was inserted into the capless unit. It was found that the recirculation line diameter is a very sensitive design parameter and increasing the diameter would result in fuel vapour leaking back out into the atmosphere. Similarly, increasing the back pressure by swapping to a different carbon canister would result in the leakage of fuel vapour. On the other hand, insignificant changes in system behaviour were observed when the fuel pistol angle was changed.
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Riström, Anton, et Aditya Naronikar. « CFD and Experimental Study of Refuelling and Venting a Fuel System ». Thesis, Luleå tekniska universitet, Rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75410.

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In 1999, California Air Resources Board (CARB) implemented a regulation that required all gasoline cars sold in California be fitted with an Onboard Refueling Vapor Recovery System (ORVR). The ORVR system is designed to prevent Volatile Organic Compounds (VOCs) from escaping into the atmosphere during refuelling by storing the gas vapours in a carbon canister. Due to the complex nature of the fuel system, making design changes could have large implications on the ORVR performance of the vehicle. It is therefore desirable to develop a CFD model that can predict the effects of design changes, thereby reducing the need to perform physical tests on each design iteration. This master thesis project was performed at the Fuel Systems department at Volvo Cars in order to help reduce project lead times and product development costs by incorporating CFD as a part of the fuel system development cycle. The CFD results obtained were validated through experimental tests that were also performed as part of this project. In this master thesis project, a CFD model was developed to simulate the refuelling of gasoline for a California specification Volvo XC90 with an OPW-11B pump pistol. The model was set up in STAR-CCM+ using the Eulerian Volume of Fluid model for multiphase flow, the RANS realizable k − ε turbulence model and the two layer all y + wall treatment. The effects of the carbon canister were modelled as a porous baffle interface in the simulations where viscous and inertial resistances of the porous media were adjusted to obtain a desired pressure drop across the canister. This method proved to be a suitable simplification for this study. The effects of evaporation as well as a chemical adsorption model for the carbon canister have been excluded from the project due to time limitations. It was found that the CFD simulations were in good agreement with the experimental results, especially with respect to capturing the overall behaviour of the fuel system during refuelling. It was found that resolving the flow spatially (and temporally) in the filler pipe was a crucial part in ensuring solver stability. A pressure difference between experiment and simulation was also observed as a consequence of excluding evaporation from the CFD model. After the CFD model had been verified and validated, changes to different parts of the fuel system were investigated to observe their effects on ORVR performance. These included changing the recirculation line diameter, changing the carbon canister properties and changing the angle of how the pump pistol was inserted into the capless unit. It was found that the recirculation line diameter is a very sensitive design parameter and increasing the diameter would result in fuel vapour leaking back out into the atmosphere. Similarly, increasing the back pressure by swapping to a different carbon canister would result in the leakage of fuel vapour. On the other hand, insignificant changes in system behaviour were observed when the fuel pistol angle was changed.In 1999, California Air Resources Board (CARB) implemented a regulation that required all gasoline cars sold in California be fitted with an Onboard Refueling Vapor Recovery System (ORVR). The ORVR system is designed to prevent Volatile Organic Compounds (VOCs) from escaping into the atmosphere during refuelling by storing the gas vapours in a carbon canister. Due to the complex nature of the fuel system, making design changes could have large implications on the ORVR performance of the vehicle. It is therefore desirable to develop a CFD model that can predict the effects of design changes, thereby reducing the need to perform physical tests on each design iteration. This master thesis project was performed at the Fuel Systems department at Volvo Cars in order to help reduce project lead times and product development costs by incorporating CFD as a part of the fuel system development cycle. The CFD results obtained were validated through experimental tests that were also performed as part of this project. In this master thesis project, a CFD model was developed to simulate the refuelling of gasoline for a California specification Volvo XC90 with an OPW-11B pump pistol. The model was set up in STAR-CCM+ using the Eulerian Volume of Fluid model for multiphase flow, the RANS realizable k − ε turbulence model and the two layer all y + wall treatment. The effects of the carbon canister were modelled as a porous baffle interface in the simulations where viscous and inertial resistances of the porous media were adjusted to obtain a desired pressure drop across the canister. This method proved to be a suitable simplification for this study. The effects of evaporation as well as a chemical adsorption model for the carbon canister have been excluded from the project due to time limitations. It was found that the CFD simulations were in good agreement with the experimental results, especially with respect to capturing the overall behaviour of the fuel system during refuelling. It was found that resolving the flow spatially (and temporally) in the filler pipe was a crucial part in ensuring solver stability. A pressure difference between experiment and simulation was also observed as a consequence of excluding evaporation from the CFD model. After the CFD model had been verified and validated, changes to different parts of the fuel system were investigated to observe their effects on ORVR performance. These included changing the recirculation line diameter, changing the carbon canister properties and changing the angle of how the pump pistol was inserted into the capless unit. It was found that the recirculation line diameter is a very sensitive design parameter and increasing the diameter would result in fuel vapour leaking back out into the atmosphere. Similarly, increasing the back pressure by swapping to a different carbon canister would result in the leakage of fuel vapour. On the other hand, insignificant changes in system behaviour were observed when the fuel pistol angle was changed.
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Livres sur le sujet "CFD experimental"

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Santoro, Robert J. Detailed experimental data for CFD code validation. University Park, PA : Propulsion Engineering Research Center, College of Engineering, Pennsylvania State University, 1998.

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D, Robertson David, Moyer Seth A et Ames Research Center, dir. An integrated CFD/experimental analysis of aerodynamic forces and moments. Moffett Field, Calif : National Aeronautics and Space Administration, Ames Research Center, 1989.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. A selection of experimental test cases for the validation of CFD codes. Neuilly-sur-Seine, France : AGARD, 1994.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. A selection of experimental test cases for the validation of CFD codes. Neuilly-sur-Seine : AGARD, 1994.

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B, Springsteen, et National Risk Management Research Laboratory (U.S.), dir. Experimental investigation of PIC formation during CFC incineration. Washington, DC : U.S. Environmental Protection Agency, Office of Research and Development, 1996.

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Air and Energy Engineering Research Laboratory et Energy and Environmental Research Corp, dir. Experimental investigation of PIC formation in CFC incineration. Washington, DC : U.S. Environmental Protection Agency, Office of Research and Development, 1991.

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Symposium on Naval Hydrodynamics (21st 1996 Trondheim, Norway). Twenty-First Symposium on Naval Hydrodynamics : Wave-induced ship motions and loads, frontier experimental techniques, wake dynamics, viscous ship hydrodynamics, water entry, wave hydrodynamics/stratified flow, bluff body hydrodynamics, hydrodynamics in ship design, shallow water hydrodynamics, cavitation and bubbly flows, propulsor hydrodynamics/hydroacoustics, fluid dynamics in the naval context, CFD validation. Washington, D.C : National Academy Press, 1997.

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Looyen, W. J. CAESAR, a CCD airborne experimental scanner for applications in remote sensing radiometric and geometric calibration. Amsterdam : National Aerospace Laboratory, 1989.

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Micol, John R. Hypersonic lateral and directional stability characteristics of Aeroassist Flight Experiment configuration in air and CF4. Hampton, Va : Langley Research Center, 1993.

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Between us and the moon. New York : HarperTeen, an imprint of HarperCollinsPublishers, 2015.

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Chapitres de livres sur le sujet "CFD experimental"

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Perakis, Nikolaos, et Oskar J. Haidn. « Experimental and Numerical Investigation of CH$$_4$$/O$$_2$$ Rocket Combustors ». Dans Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 359–79. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_23.

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Abstract The experimental investigation of sub-scale rocket engines gives significant information about the combustion dynamics and wall heat transfer phenomena occurring in full-scale hardware. At the same time, the performed experiments serve as validation test cases for numerical CFD models and for that reason it is vital to obtain accurate experimental data. In the present work, an inverse method is developed able to accurately predict the axial and circumferential heat flux distribution in CH$$_4$$/O$$_2$$ rocket combustors. The obtained profiles are used to deduce information about the injector-injector and injector-flame interactions. Using a 3D CFD simulation of the combustion and heat transfer within a multi-element thrust chamber, the physical phenomena behind the measured heat flux profiles can be inferred. A very good qualitative and quantitative agreement between the experimental measurements and the numerical simulations is achieved.
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Gowtham Sanjai, S., Vishal Suresh, Raman Bedi et A. Sumanthran. « Experimental Approach and CFD Analysis on Flow Devices ». Dans Advances in Fluid Dynamics, 427–36. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4308-1_33.

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Sura, Jigarkumar. « CFD Simulation of Hypersonic Shock Tunnel Nozzle ». Dans Recent Advances in Theoretical, Applied, Computational and Experimental Mechanics, 381–86. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1189-9_30.

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Boumrar, Iddir, et Zied Driss. « Numerical Simulation and Experimental Validation of the Role of Delta Wing Privileged Apex ». Dans CFD Techniques and Thermo-Mechanics Applications, 151–71. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70945-1_7.

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Bahri, Harshit, Kaushalendra Kumar Singh et Harvendra Singh. « CFD Study of Two-Dimensional Profile Geometry of an Airfoil ». Dans Computational and Experimental Methods in Mechanical Engineering, 177–87. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2857-3_19.

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bin Md. Kamal, Muhammad Naim, Khairul Shahril bin Shaffee, Mohamad Sabri bin Mohamad Sidik, Ahmad Razlee Ab. Kadir et Johan Ihsan bin Mahmood. « Francis Turbine Analysis Between Computational Fluid Dynamics (CFD) and Experimental Methods ». Dans Advanced Structured Materials, 161–72. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05621-6_14.

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Kallio, S., M. Guldén et A. Hermanson. « Experimental Study and CFD Simulation of a 2D Circulating Fluidized Bed ». Dans Proceedings of the 20th International Conference on Fluidized Bed Combustion, 799–804. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02682-9_123.

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Heinrich, Ralf. « Implementation and Usage of Structured Algorithms within an Unstructured CFD-Code ». Dans New Results in Numerical and Experimental Fluid Mechanics V, 430–37. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-33287-9_53.

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Nastac, L., K. Redkin, C. Hrizo, Sean M. Loney et K. Marsden. « Numerical Modeling and Experimental Verification of Macrosegregation and CET Predictions in Large Steel Roll Ingots ». Dans CFD Modeling and Simulation in Materials Processing 2018, 43–51. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72059-3_5.

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Duan, Zhenhu, Houfa Shen, Jinwu Kang et Baicheng Liu. « Numerical Study and Experimental Validation of Multiple Pouring Process in A 438-t Steel Ingot ». Dans CFD Modeling and Simulation in Materials Processing 2016, 203–11. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274681.ch25.

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Actes de conférences sur le sujet "CFD experimental"

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

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WEIR, LOIS, D. R. REDDY et GEORGE RUPP. « Mach 5 inlet CFD and experimental results ». Dans 25th Joint Propulsion Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-2355.

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Kanase, Rohit S., Madhu L. Kasturi, Ashok T. Pise et Pravin C. Garje. « Experimental and CFD Analysis of Regenerative Pump ». Dans Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017). Connecticut : Begellhouse, 2018. http://dx.doi.org/10.1615/ihmtc-2017.3400.

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Selvamuthukumaran, D., N. Babu, M. Samuel Gemsprim et N. Aravindkumar. « CFD analysis of axisymmetry cylinder in heave ». Dans Proceeding of 2nd International Colloquium on Computational & Experimental Mechanics (ICCEM 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0108116.

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Sahili, Jihad, et Kawthar Zaidan. « ROV Propellers Optimization using CAD Design and CFD Modeling and Experimental Validation ». Dans 2018 6th RSI International Conference on Robotics and Mechatronics (IcRoM). IEEE, 2018. http://dx.doi.org/10.1109/icrom.2018.8657543.

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Austin, James, Shigeo Hayashibara et Robert Najaka. « Experimental and CFD Analysis of Aerial Refueling System ». Dans General Aviation Technology Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2006. http://dx.doi.org/10.4271/2006-01-2386.

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De Vita, A., et L. Allocca. « Experimental Analysis and CFD Simulation of GDI Sprays ». Dans SAE 2003 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2003. http://dx.doi.org/10.4271/2003-01-0004.

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Paschal, Keith, Dan Neuhart, George Beeler et Brian Allan. « Circulation Control Model Experimental Database for CFD Validation ». Dans 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-705.

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Clutter, J. « CFD simulations of explosions compared to experimental results ». Dans 38th Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-723.

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Taylor, R. P., G. F. Nellis, S. A. Klein, R. Radebaugh, M. Lewis, P. Bradley et J. G. Weisend. « EXPERIMENTAL VALIDATION OF A PULSE TUBE CFD MODEL ». Dans TRANSACTIONS OF THE CRYOGENIC ENGINEERING CONFERENCE—CEC : Advances in Cryogenic Engineering. AIP, 2010. http://dx.doi.org/10.1063/1.3422429.

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Rapports d'organisations sur le sujet "CFD experimental"

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Hassan, Yassin A., et Victor M. Ugaz. Experimental and CFD Analysis of Advanced Convective Cooling Systems. Office of Scientific and Technical Information (OSTI), juin 2012. http://dx.doi.org/10.2172/1050435.

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Christensen, Richard N., Xiaodong Sun, Chengqi Wang, Philippe Bardet, Michael Button et Piyush Sabharwall. Experimental Investigation and CFD Analysis of Steam Ingress Accidents in HTGRs. Office of Scientific and Technical Information (OSTI), janvier 2019. http://dx.doi.org/10.2172/1492996.

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Shahnam, Mehrdad, Aytekin Gel, Arun K. Subramaniyan, Jordan Musser et Jean-Francois Dietiker. Uncertainty Quantification Analysis of Both Experimental and CFD Simulation Data of a Bench-scale Fluidized Bed Gasifier. Office of Scientific and Technical Information (OSTI), octobre 2017. http://dx.doi.org/10.2172/1398265.

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Manera, Annalisa, Michael Corradini, Victor Petrov, Mark Anderson, Casey Tompkins et Daniel Nunez. Model validation using CFD-grade experimental database for NGNP Reactor Cavity Cooling Systems with water and air. Office of Scientific and Technical Information (OSTI), février 2018. http://dx.doi.org/10.2172/1420273.

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Garg, Manish, O. Hanuma Kumar, Nagendra Prasad et Veerabathra Swamy. Experimental and CFD Simulation-Based Analytical Optimization of Air-Cooling System for a Small 4-Stroke Scooter Engine. Warrendale, PA : SAE International, octobre 2005. http://dx.doi.org/10.4271/2005-32-0026.

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J. E. O', Brien, C. M. Stoots et G. L. Hawkes. Comparison of a One-Dimensional Model of a High-Temperature Solid-Oxide Electrolysis Stack with CFD and Experimental Results. Office of Scientific and Technical Information (OSTI), novembre 2005. http://dx.doi.org/10.2172/911226.

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Morishima, Akinori, Jin Kusaka et Yasuhiro Daisho. Numerical and Experimental Analysis of Particulate Matter Formation Process in ICE Using Multi-Dimensional CFD Code Coupled With Detailed Chemistry. Warrendale, PA : SAE International, mai 2005. http://dx.doi.org/10.4271/2005-08-0313.

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Hassan, Yassin, et Nk Anand. Experimental and CFD Studies of Coolant Flow Mixing within Scaled Models of the Upper and Lower Plenums of NGNP Gas-Cooled Reactors. Office of Scientific and Technical Information (OSTI), mars 2016. http://dx.doi.org/10.2172/1253943.

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Hayes, Andrew M., Aly H. Shaaban, Jamil A. Khan, Ian G. Spearing et Reza Salavani. An Experimental, Numerical, and CFD Investigation into the Heat Transfer and Flow Characteristics in Porous Media Using a Thermal Non-Equilibrium Model. Fort Belvoir, VA : Defense Technical Information Center, octobre 2005. http://dx.doi.org/10.21236/ada450372.

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D. M. McEligot et G. E. McCreery. Scaling studies and conceptual experiment designs for NGNP CFD assessment. Office of Scientific and Technical Information (OSTI), novembre 2004. http://dx.doi.org/10.2172/911231.

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