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NAFEMS International Journal of CFD Case Studies最新文献

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Lattice-Boltzmann Methods - Basics and Recent Progress 格子-玻尔兹曼方法-基础和最新进展
NAFEMS International Journal of CFD Case Studies Pub Date : 2006-04-01 DOI: 10.59972/avnayxcs
M. Krafczyk, J. Tölke
{"title":"Lattice-Boltzmann Methods - Basics and Recent Progress","authors":"M. Krafczyk, J. Tölke","doi":"10.59972/avnayxcs","DOIUrl":"https://doi.org/10.59972/avnayxcs","url":null,"abstract":"This article gives a short overview over the formal origin and the evolution of Lattice Boltzmann (LB) methods for Computational Fluid Dynamics. The main focus is to discuss the basic framework of LB models and different model variants including boundary conditions as well as some potential fields of application. In addition we present some results of qualitative and quantitative numerical studies of different problem fields spanning laminar, turbulent, free surface and multiphase flows.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123625010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Simulation of Coupled Fluid-Solid Problems: State of the Art and Applications 流固耦合问题的数值模拟:现状与应用
NAFEMS International Journal of CFD Case Studies Pub Date : 2006-04-01 DOI: 10.59972/jpj2gjcx
M. Schäfer
{"title":"Numerical Simulation of Coupled Fluid-Solid Problems: State of the Art and Applications","authors":"M. Schäfer","doi":"10.59972/jpj2gjcx","DOIUrl":"https://doi.org/10.59972/jpj2gjcx","url":null,"abstract":"The paper gives a survey on relevant topics related to the numerical simulation of coupled fluid-solid problems. Firstly, the corresponding problems are classifed according to different possible coupling mechanisms. The modelling of the problems within a continuum mechanical framework are discussed and numerical aspects related to discretization and solution procedures are addressed. Exemplary approaches for these issues are indicated. A variety of numerical examples involving various coupling mechanisms are presented, including a discussion of questions of numerical accuracy and computational efficiency of numerical solution procedures.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124519064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Free Surface Jet Flow Interaction with a Pelton Bucket 自由表面射流与佩尔顿桶的相互作用
NAFEMS International Journal of CFD Case Studies Pub Date : 2006-04-01 DOI: 10.59972/mmcrnj06
F. Muggli, T. Wintergerste
{"title":"Free Surface Jet Flow Interaction with a Pelton Bucket","authors":"F. Muggli, T. Wintergerste","doi":"10.59972/mmcrnj06","DOIUrl":"https://doi.org/10.59972/mmcrnj06","url":null,"abstract":"The various flow phenomena in a Pelton turbine are quite complex and include the interaction of free surface jets with buckets in a rotating frame of reference. As the use of CFD for such flows is rather new it was decided to carry out individual validations of the flow codes for the different flow features. The main focus is the interaction of the jet with the bucket. The flow structures upstream of the jet have a strong influence on the jet shape and direction as well as on the secondary flow structure in the jet. Careful validations proofed that the selected CFD codes are able to compute these flows accurately. Based on this experience the flow of the free surface jet interacting with the buckets has been computed and the results have been compared to experimental data. These comparisons are in good agreement and provide the designer of Pelton turbines with a new insight and data previously not available. Inclusion of CFD flow predictions into the design process of Pelton turbines reduces development time and opens up new opportunities for optimization.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130452973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Analysis of Material Flow in Continuously Reinforced Extrusion of Profiles 型材连续强化挤压过程中物料流动的数值分析
NAFEMS International Journal of CFD Case Studies Pub Date : 2006-04-01 DOI: 10.59972/s0hnjpsh
M. Schikorra, M. Schomäcker, M. Kleiner
{"title":"Numerical Analysis of Material Flow in Continuously Reinforced Extrusion of Profiles","authors":"M. Schikorra, M. Schomäcker, M. Kleiner","doi":"10.59972/s0hnjpsh","DOIUrl":"https://doi.org/10.59972/s0hnjpsh","url":null,"abstract":"The production of continuously reinforced profiles by use of aluminum as base material and a reinforcement made of steel or carbon offers a great potential for modern lightweight constructions. Within this scope, they present the potential for an increase in usage of space frame constructions in automotive or aerospace engineering. But the insertion of reinforcement in the material flow of the extrusion process leads to a significant local perturbation inside of the forming tool: while the velocity of the base material increases due to the increasing press ration the velocity of the reinforcement remains constant at the profiles out-coming velocity. These effect leads in the compound zone to the induction of tensile stresses into the reinforcement which result in failures like cracking during the extrusion process. By use of a coupled thermo-mechanical finite element simulation with the commercial fe-codes Superform from MSC and HyperXtrude from Altair the velocity fields of an extrusion process with and without reinforcement were calculated and the resulting stress components were analysed. Based on these results, a process optimisation to reduce stresses on the reinforcement has been carried out, for example by a modification of the tool geometry. The numerical results went along with experiments to verify the calculated failures and the optimised process.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114230297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Methodology for Industrial CFD 工业CFD的方法论
NAFEMS International Journal of CFD Case Studies Pub Date : 2004-01-01 DOI: 10.59972/grz5jq8h
J. Shaikh
{"title":"A Methodology for Industrial CFD","authors":"J. Shaikh","doi":"10.59972/grz5jq8h","DOIUrl":"https://doi.org/10.59972/grz5jq8h","url":null,"abstract":"The central tenet of this paper is that there is no fixed level of credibility or accuracy that is applicable to all CFD simulations. The required level of accuracy is dependent on the industrial context for the work. This paper describes a framework suggested by the American Institute of Aeronautics and Astronautics [1] designed to aid the assessment of the credibility of CFD simulations. The framework distinguishes between Reality, the Conceptual Model of Reality and the Computational CFD model. The processes of Qualification, Verification and Validation are used to assess the levels of Error and Uncertainty within the simulation system. The methodology presented is not exhaustive and is intended to act as a guideline for the assessment of Industrial CFD simulations.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"372 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126714096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Validation Strategy For The CFD Modelling Of Coal-Fired Equipment 燃煤设备CFD建模的验证策略
NAFEMS International Journal of CFD Case Studies Pub Date : 2004-01-01 DOI: 10.59972/r7656ms9
A. Green, M. Waite
{"title":"A Validation Strategy For The CFD Modelling Of Coal-Fired Equipment","authors":"A. Green, M. Waite","doi":"10.59972/r7656ms9","DOIUrl":"https://doi.org/10.59972/r7656ms9","url":null,"abstract":"The chain-grate stoker is a well-established lump coal firing method for furnaces. Its current use for coal in the UK and USA is limited to old plant but is extensive in Eastern Europe, India and China. Problems associated with its use stem from gaseous and fly ash pollution. The mathematical modelling of such a system was undertaken as part of an initiative funded by European Coal and Steel Consortium. The objective was to produce a model suitable for use by, e.g. plant manufacturers, to show the effect of design modifications. This would be especially for efficiency improvement and pollution reduction. The main experimental work was carried out using the chain grate stoker rig facilities of CRE, Cheltenham...","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121957594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CFD Validation for External Aerodynamics Part 2: Full Car Validation 外部空气动力学CFD验证第2部分:整车验证
NAFEMS International Journal of CFD Case Studies Pub Date : 2004-01-01 DOI: 10.59972/8c5efufc
R. Lewis, P. Postle
{"title":"CFD Validation for External Aerodynamics Part 2: Full Car Validation","authors":"R. Lewis, P. Postle","doi":"10.59972/8c5efufc","DOIUrl":"https://doi.org/10.59972/8c5efufc","url":null,"abstract":"This paper examines issues associated with the CFD modelling of a complete racing car in comparison with physical testing. In particular, the issue of how a CFD analysis may be invalid, simply because it does not replicate the set-up of the physical test sufficiently, is examined. Convergence options are also discussed.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134538959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CFD Validation for External Aerodynamics Part 1: Validating Component Analysis 外部空气动力学的CFD验证第1部分:验证组件分析
NAFEMS International Journal of CFD Case Studies Pub Date : 2004-01-01 DOI: 10.59972/8gzlg6cv
R. Lewis, P. Postle
{"title":"CFD Validation for External Aerodynamics Part 1: Validating Component Analysis","authors":"R. Lewis, P. Postle","doi":"10.59972/8gzlg6cv","DOIUrl":"https://doi.org/10.59972/8gzlg6cv","url":null,"abstract":"Validating external aerodynamics is often a complex process with more to consider than just obtaining the correct forces. This paper examines some of the issues related to the CFD modelling of car components such as wings, wheel assemblies and radiators. The types of mesh, choice of turbulence model and wall resolution (measured in terms of y+) are also discussed.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121181445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Application and Validation of a CFD Analysis to Simulate the Flow into a Helicopter Engine Intake 直升机发动机进气道流动CFD模拟的应用与验证
NAFEMS International Journal of CFD Case Studies Pub Date : 2004-01-01 DOI: 10.59972/put53ydj
A. D. de Souza
{"title":"The Application and Validation of a CFD Analysis to Simulate the Flow into a Helicopter Engine Intake","authors":"A. D. de Souza","doi":"10.59972/put53ydj","DOIUrl":"https://doi.org/10.59972/put53ydj","url":null,"abstract":"The simulation of flow through engine air particle separators (EAPS) into helicopter intakes is a good design application for CFD analysis. The series of simulations presented here were carried out during the design stage of the project to provide confidence in operational parameters and reduce risk. Although for certification reasons testing was required before final design approval, the use of CFD enabled the flow parameters to be verified and confidence gained in the design prior to testing. The simulations also provided useful data on the operation of the EAPS that is costly to obtain from testing alone. The subsequent testing provided valuable data for validating the CFD simulations.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114999538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fluent Validation for Incompressible Flow Through a 0.5 Aspect Ratio Orifice and Compressible Flow Through a Sharp-Edged Slit 0.5宽高比孔板不可压缩流动和锐边狭缝可压缩流动的流畅性验证
NAFEMS International Journal of CFD Case Studies Pub Date : 2000-02-01 DOI: 10.59972/nv82e8uk
Q. Rayer, G. Snowsill
{"title":"Fluent Validation for Incompressible Flow Through a 0.5 Aspect Ratio Orifice and Compressible Flow Through a Sharp-Edged Slit","authors":"Q. Rayer, G. Snowsill","doi":"10.59972/nv82e8uk","DOIUrl":"https://doi.org/10.59972/nv82e8uk","url":null,"abstract":"Validation against air systems problems is required to enable CFO codes to be confidently used in the design of turbine cooling air systems. CFO calculations of orifice and slit discharge coefficients (Cd) have been compared with measured and theoretical values. The literature details quantitative data for these cooling system elements. The turbulence model used critically affected the accuracy of incompressible calculations for a 0.5 aspect ratio orifice. Although commonly used in engines, this aspect ratio caused difficulties in accurately simulating flow reattachment. Sharp-edged slit compressible Cd calculations agreed with theory to 4%. These results give confidence that CFO will become a valuable tool for evaluating air system losses in novel configurations.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"652 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122958500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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