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NAFEMS International Journal of CFD Case Studies最新文献

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Prediction of Turbulent Heat Transfer for Industrial Drying Processes – Turbulence Model Assessment 工业干燥过程湍流传热的预测。湍流模型评估
NAFEMS International Journal of CFD Case Studies Pub Date : 2011-03-01 DOI: 10.59972/n2vy3bq0
Q. Ye, K. Pulli, A. Scheibe
{"title":"Prediction of Turbulent Heat Transfer for Industrial Drying Processes – Turbulence Model Assessment","authors":"Q. Ye, K. Pulli, A. Scheibe","doi":"10.59972/n2vy3bq0","DOIUrl":"https://doi.org/10.59972/n2vy3bq0","url":null,"abstract":"This paper presents numerical investigations of turbulent heat transfer for industrial drying processes. The CFD code FLUENT was applied. The performance of various turbulence models, especially the grid sensitivity to the prediction of the Nusselt number, was tested using available experimental data of single jet impingement and the DNS data of channel flow. The sst-kˆ turbulence model with enhanced wall function that was found to give a reasonably accurate prediction of heat transfer with lower grid sensitivity was applied to the flow calculation in dryers. Flat sheets as well as more complicated geometries of substrates, for instance, a truck chassis were used in the simulations. The calculated heating-up behaviour on the substrates was compared with experimental results.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133392048","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
3D-CFD Simulation of Mixture Formation, Combustion and Heat Transfer Processes with AVL FIRE AVL FIRE混合气形成、燃烧和传热过程的3D-CFD模拟
NAFEMS International Journal of CFD Case Studies Pub Date : 2009-12-01 DOI: 10.59972/r5w8vet6
R. Tatschl
{"title":"3D-CFD Simulation of Mixture Formation, Combustion and Heat Transfer Processes with AVL FIRE","authors":"R. Tatschl","doi":"10.59972/r5w8vet6","DOIUrl":"https://doi.org/10.59972/r5w8vet6","url":null,"abstract":"Based on selected examples the present status of 3D-CFD related to internal combustion engine applications is presented. The focus is on highlighting the current status of model validation and on demonstrating specific application methodologies using the CFD code AVL FIRE. From the broad area of diesel engine combustion system development, results of the analysis and optimization of mixture formation, combustion and pollutant formation are shown for conventional as well as alternative diesel combustion. The results quality related to the prediction of the in-cylinder pressure trace, heat release rate and pollutants is discussed in the context of related experimental data. In the field of gasoline engine development, the present possibilities related to 3D-CFD calculation of premixed flame propagation for the analysis and optimization of full load SI-engine combustion performance is presented. The applicability of the adopted models as well as their predictive capabilities are demonstrated based upon selected results of calculated flame propagation and knock onset characteristics and comparison of the results with related experimental data. Finally, the possibilities of 3D-CFD in the context of the analysis and optimization of the thermal loading of structural components are presented. The application of novel models for the calculation of the gas- and water-side heat transfer including coupled fluid / thermal calculations is demonstrated for the thermal analysis of the head-block compound of a passenger car SI-engine.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117063220","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
Analysis of unsteady fluid flow inside fluid power components – a challenge to CFD-simulation 流体动力元件内部非定常流动分析——cfd模拟的一个挑战
NAFEMS International Journal of CFD Case Studies Pub Date : 2009-12-01 DOI: 10.59972/nafcbany
F. Rüdiger, A. Leonhard, W. Wustmann, S. Helduser
{"title":"Analysis of unsteady fluid flow inside fluid power components – a challenge to CFD-simulation","authors":"F. Rüdiger, A. Leonhard, W. Wustmann, S. Helduser","doi":"10.59972/nafcbany","DOIUrl":"https://doi.org/10.59972/nafcbany","url":null,"abstract":"Hydraulic and pneumatic valves and hydrostatic pumps are key-components of fluid power drive and control systems. Due to their inherent transient operating conditions and the moving devices included they are posing challenges for numerical simulation. Unsteady fluid flow, moving and deforming flow domain and strong nonlinearities caused by physical phenomenon like aeration and cavitation in hydraulics and shock waves in pneumatics are some of them. Another aspect of increasing importance in design of fluid power components is the need of reduced pulsation and noise emission...","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132004702","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
Multibody Simulation of an Oscillating Aeroelastic Wing Model 振荡气动弹性机翼模型的多体仿真
NAFEMS International Journal of CFD Case Studies Pub Date : 2009-12-01 DOI: 10.59972/ghx4dqen
J. Arnold, G. Einarsson, W. Krüger
{"title":"Multibody Simulation of an Oscillating Aeroelastic Wing Model","authors":"J. Arnold, G. Einarsson, W. Krüger","doi":"10.59972/ghx4dqen","DOIUrl":"https://doi.org/10.59972/ghx4dqen","url":null,"abstract":"The central challenge is to simulate the time-accurate aeroelastic coupling of the flexible wing model of a transport aircraft with a non-linear aerodynamic solver in forced oscillations of large amplitude which are superimposed by rigid body motions. The rigid motions introduce flight mechanical aspects to the aeroelastic simulation. The simulation platform described in this work is one of two investigated variants in the DLR project SikMa and is characterized by the use of a multibody system (MBS) to account for the elastic structure as well as the flight mechanics and its loose coupling to the computational fluid dynamics (CFD) software. The exchanged data is interpolated with a commercial mesh coupling tool and transferred through an internet socket allowing a distributed computational environment. Simulations for the wind tunnel setup of the wing model cover the prediction of the aeroelastic state of equilibrium and forced oscillations for heave and pitch excitations. In the case of equilibrium, the simulation results are partially compared to wind tunnel data.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130351805","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: 8
Numerical Investigation of Droplet Distribution from a Pre-filming Air-blast Atomizer 预膜式鼓风雾化器雾滴分布的数值研究
NAFEMS International Journal of CFD Case Studies Pub Date : 2009-12-01 DOI: 10.59972/32nd8uks
C. Poovanna, S. Sridhara
{"title":"Numerical Investigation of Droplet Distribution from a Pre-filming Air-blast Atomizer","authors":"C. Poovanna, S. Sridhara","doi":"10.59972/32nd8uks","DOIUrl":"https://doi.org/10.59972/32nd8uks","url":null,"abstract":"The combustion characteristics and emission from a gas turbine greatly depends on the spray characteristics. Pre-filming air-blast atomizers are commonly used in gas turbines due to their high spray cone angle and shorter atomization axial distance when compared to direct air-blast atomizers. Various numerical models are available in the open literature for predicting droplet characteristics. In the present study commercial code FLUENT 6.3 is used to predict the spray characteristics. The numerical results are validated against experimental results and further the spray characteristics in terms of radial Sauter mean diameter (SMD), mass flux distribution at varied axial distance and swirl number (S) have been discussed. The variation of predicted SMD with swirl number demonstrated a decrease in its value for each level of increase in the swirl number. Smaller droplets start to appear further downstream in addition to significant increase in radial spread of droplets. Negligible mass contribution from the smaller droplets at the boundary compared to that from bigger droplets at the centre was observed. Recessing the liquid tube at the exit of air nozzles showed a slight decrease in SMD. Recessing the liquid tube in the exit air nozzles results in a slight in SMD values, hence, the recessing of liquid post in the atomizer within certain limit might be beneficial not only helping in flame holding but also resulting in finer spray. The lessons learnt from this study on use of CFD for simulating the atomization process is highlighted.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129615153","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 Painting Processes 涂装过程的数值模拟
NAFEMS International Journal of CFD Case Studies Pub Date : 2009-12-01 DOI: 10.59972/11x97e6u
A. Scheibe, E. Westkämper, Q. Ye
{"title":"Numerical Simulation of Painting Processes","authors":"A. Scheibe, E. Westkämper, Q. Ye","doi":"10.59972/11x97e6u","DOIUrl":"https://doi.org/10.59972/11x97e6u","url":null,"abstract":"The present contribution summarises ongoing investigations performed at the Institut für Industrielle Fertigung und Fabrikbetrieb (IFF) on the numerical simulation of spray painting in the automotive industry. Numerical models for electro-statically supported or pneumatic painting processes were implemented in a CFD code. These models account for all important effects involved in the relevant physical processes, being able to predict the film thickness distribution and the paint transfer efficiency on the work piece. Some tests on complicated targets have been carried out. The results confirm the applicability and reliability of the chosen models for the painting processes.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121445381","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
Initial Validation of Cross Wind Effects on a Static High-Sided Vehicle 静态高侧车辆侧风效应的初步验证
NAFEMS International Journal of CFD Case Studies Pub Date : 2008-08-01 DOI: 10.59972/4lbanpv1
D. Hargreaves, H. Morvan
{"title":"Initial Validation of Cross Wind Effects on a Static High-Sided Vehicle","authors":"D. Hargreaves, H. Morvan","doi":"10.59972/4lbanpv1","DOIUrl":"https://doi.org/10.59972/4lbanpv1","url":null,"abstract":"Computational Fluid Dynamics (CFD) has long been used by the automotive industry to optimise vehicle designs. Typically, simulations are performed with a vehicle moving into stationary air and the effect of the wind is ignored. This paper brings the wind effects to the fore and describes the set-up of a series of CFD simulations with a moving vehicle subject to a strong cross wind. The results from a series of CFD simulations of a static vehicle subject to a cross wind from a number of yaw angles are compared against both full scale and wind tunnel data. All simulations are transient and time-averaged values of drag, lift and overturning moments are presented. The positive and negative aspects of the modelling are discussed and a number of ideas for future work are presented.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127095357","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: 3
A Weak Compressible Flow Solution for Fluid and Air-Borne Acoustics Coupled Problems in a Nonlinear System 非线性系统中流体与空气声学耦合问题的弱可压缩流解
NAFEMS International Journal of CFD Case Studies Pub Date : 2008-08-01 DOI: 10.59972/pt108tyk
M. Zhu, A. Tabbal, M. Megahed, G. Pierrot, P. Ravier
{"title":"A Weak Compressible Flow Solution for Fluid and Air-Borne Acoustics Coupled Problems in a Nonlinear System","authors":"M. Zhu, A. Tabbal, M. Megahed, G. Pierrot, P. Ravier","doi":"10.59972/pt108tyk","DOIUrl":"https://doi.org/10.59972/pt108tyk","url":null,"abstract":"This paper presents the implementation and validation of a numerical simulation method that takes into account the air-borne acoustic wave propagation within the turbulent flow solution at low Mach numbers. The method is called weak compressibility, and is used in order to cope with fully coupled aero-acoustics problem in a nonlinear system. The weak compressibility was implemented into an explicit incompressible flow solver using an edgebased finite element method. A single 3D cavity case was used to validate the method in comparison with the experiment. The simulated results showed good agreement with the experimental data with regards to the acoustic pressure and frequency for the dominant peak of the sound pressure level (SPL) spectra over a wide speed range from 15 to 55 meters per second.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123397282","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
Simulation of Flows With Free Surfaces 自由表面流动的模拟
NAFEMS International Journal of CFD Case Studies Pub Date : 2008-08-01 DOI: 10.59972/qeqsbc3v
S. Muzaferija, M. Perić
{"title":"Simulation of Flows With Free Surfaces","authors":"S. Muzaferija, M. Perić","doi":"10.59972/qeqsbc3v","DOIUrl":"https://doi.org/10.59972/qeqsbc3v","url":null,"abstract":"Flows with free surfaces are often encountered in engineering and environment, in many variations. In this manuscript we present the state-of-the-art in simulating flows with free surfaces in complex geometries. The two major groups of methods for computing free surface flows – interface-tracking and interface-capturing – are briefly described. The emphasis is on presenting the advantages and disadvantages of each class with respect to particular application areas, ranging from the micro-scale (droplet and jets) to large-scale flows (ocean waves). Results from selected applications are used to demonstrate the quality of obtainable solutions.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"392 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132683371","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
Calculation of the characteristic diagram of an axial fan using CFD 用CFD计算轴流风机的特性图
NAFEMS International Journal of CFD Case Studies Pub Date : 2008-08-01 DOI: 10.59972/d6uf68ex
T. Wolfanger, M. Lenartz
{"title":"Calculation of the characteristic diagram of an axial fan using CFD","authors":"T. Wolfanger, M. Lenartz","doi":"10.59972/d6uf68ex","DOIUrl":"https://doi.org/10.59972/d6uf68ex","url":null,"abstract":"The characteristic curves of a ventilator with adjustable blade angle were calculated using CFD. The characteristic curve is valid for a certain blade angle of a single stage ventilator and was measured on a test stand according to DIN 24163. To evaluate the critical points for the calculation of the characteristic curves, a number of blade angles have been considered. It turned out that the points with the maximum deviation between measurement and calculation were lying close to the optimum efficiency point of the fan operation in the vicinity of the separation line. For further studies of the influence of mesh resolution, turbulence modelling and geometric modelling, one operation point showing relatively large deviations from the measurements was chosen. For this operation point, a successive refinement of the mesh was done to get a grid independent solution. The mesh of the grid independent solution was used to study the influence of several turbulence models including two equation k-ε and k-ω models and a ω based Reynolds stress model and the influence of the blade tip gap. Finally, one curve from the characteristic diagram was recalculated using the best performing turbulence model and the results were compared to measurements.","PeriodicalId":183819,"journal":{"name":"NAFEMS International Journal of CFD Case Studies","volume":"32 44","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113933901","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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