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Experimental and Numerical Investigations on Time-Resolved Flow Field Data of a Full-Scale Open-Jet Automotive Wind Tunnel
Technical Paper
2021-01-0939
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE WCX Digital Summit
Language:
English
Abstract
One main goal of the automotive industry is to reduce the aerodynamic drag of passenger vehicles. Therefore, a deeper understanding of the flow field is necessary. Time-resolved data of the flow field is required to get an insight into the complex unsteady flow phenomena around passenger vehicles. This data helps to understand the temporal development of wake structures and enables the analysis of the formation of vortical structures. Numerical simulations are an efficient method to analyze the time-resolved data of the unsteady flow field. The analysis of the steady and unsteady numerical data is only relevant for aerodynamic developments in the wind tunnel, if the predicted temporal evolving structures of a passenger vehicle’s simulated flow field correspond to the structures of the flow field in the wind tunnel. In this study, time-resolved measurements of the empty wind tunnel and a notchback passenger vehicle in the wind tunnel are conducted. The temporal structures of the vehicle’s wake are investigated with a hot-wire anemometer. These measurements help to understand the occurring unsteady flow phenomena at the vehicle in the wind tunnel. Furthermore, the measured data is used as a reference for the comparison of the time-resolved numerical data with the experimental data. For the numerical data, an unsteady Spalart-Allmaras Delayed Detached Eddy Simulation in OpenFOAM® is used and compared to measurements in an automotive wind tunnel. This comparison shows differences in the unsteady datasets. Therefore, a novel approach for the numerical simulation of wind tunnel tests is presented here. A temporal evolving boundary condition ensures an improved correlation between the numerical data and the experimental wind tunnel data. With this optimized numerical setup, fundamental improvements are achieved. Additionally, the findings of numerical time-resolved analysis methods are gaining in relevance for the aerodynamic development.
Authors
Citation
Sebald, J., Reiss, J., Kiewat, M., and Indinger, T., "Experimental and Numerical Investigations on Time-Resolved Flow Field Data of a Full-Scale Open-Jet Automotive Wind Tunnel," SAE Technical Paper 2021-01-0939, 2021, https://doi.org/10.4271/2021-01-0939.Data Sets - Support Documents
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References
- Prandtl , L. , Betz , A. 1927
- von Schulz-Hausmann , F.K. and Vagt , J.-D. Influence of Test-Section Length and Collector Area on Measurements in ¾-Open-Jet Automotive Wind Tunnels SAE Technical Paper 880251 1988 https://doi.org/10.4271/880251
- Mercker , E. , and Wiedemann , J. On the Correction of Interference Effects in Open Jet Wind Tunnels SAE Technical Paper 960671 1996 https://doi.org/10.4271/960671
- Mercker , E. , Wickern , G. , and Wiedemann , J. Contemplation of Nozzle Blockage in Open Jet Wind-Tunnels in View of Different ‘Q‘ Determination Techniques SAE Technical Paper 970136 1997 https://doi.org/10.4271/970136
- Mercker , E. , and Cooper , K.R. The Influence of a Horizontal Pressure Distribution on Aerodynamic Drag in Open and Closed Wind Tunnels SAE Technical Paper 2005-01-0867 2005 https://doi.org/10.4271/2005-01-0867
- Wickern , G. On the Application of Classical Wind Tunnel Corrections for Automotive Bodies SAE Technical Paper 2001-01-0633 2001 https://doi.org/10.4271/2001-01-0633
- Wickern , G. , Dietz , S. , and Luehrmann , L. Gradient Effects on Drag Due to Boundary-Layer Suction in Automotive Wind Tunnels SAE Technical Paper 2003-01-0655 2003 https://doi.org/10.4271/2003-01-0655
- Wickern , G. , and Schwartekopp , B. Correction of Nozzle Gradient Effects in Open Jet Wind Tunnels SAE Technical Paper 2004-01-0669 2004 https://doi.org/10.4271/2004-01-0669
- Wickern , G. A Theoretical Approach towards the Self-Correcting Open Jet Wind Tunnel SAE Technical Paper 2014-01-0579 2014 https://doi.org/10.4271/2014-01-0579
- Wiedemann , J. , Fischer , O. , and Jiabin , P. Further Investigations on Gradient Effects SAE Technical Paper 2004-01-0670 2004 https://doi.org/10.4271/2004-01-0670
- Hoffman , J. , Martindale , B. , Arnette , S. , Williams , J. et al. Effect of Test Section Configuration on Aerodynamics Drag Measurements SAE Technical Paper 2001-01-0631 2001 https://doi.org/10.4271/2001-01-0631
- Hoffman , J. , Martindale , B. , Arnette , S. , Williams , J. Development of Lift and Drag Corrections for Open Jet Wind Tunnel Tests for an Extended Range of Vehicle Shapes SAE Technical Paper 2003-011-0934 https://doi.org/10.4271/2003-01-0934
- Cooper , K.R. , and Mokry , M. The Two-Variable Boundary-Interference Correction Applied to Automotive Aerodynamic Data SAE Technical Paper 2008-01-1204 2008 https://doi.org/10.4271/2008-01-1204
- Cooper , K.R. , Mercker , E. , and Müller , J. The Necessity for Boundary Corrections in a Standard Practice for the Open-Jet Wind Tunnel Testing of Automobiles Proc IMechE Part D: J Automobile Engineering 231 9 1245 1273 2017 10.1177/0954407017701287
- Lounsberry , T. , and Walter , J. Practical Implementation of the Two-Measurement Correction Method in Automotive Wind Tunnels SAE Technical Paper 2015-01-1530 2015 https://doi.org/10.4271/2015-01-1530
- Wickern , G. Recent Literature on Wind Tunnel test Section Interference Related to Ground Vehicle Testing SAE Technical Paper 2007-01-1050 2007 https://doi.org/10.4271/2007-01-1050
- Fischer , O. , Kuthada , T. , Widdecke , N. , and Wiedemann , J. CFD Investigations of Wind Tunnel Interference Effects SAE Technical Paper 2007-01-1045 2007 https://doi.org/10.4271/2007-01-1045
- Fischer , O. , Kuthada , T. , Wiedermann , J. , Dethioux , P. et al. CFD Validation Study for a Sedan Scale Model in an Open Jet Wind Tunnel SAE Technical Paper 2008-01-0325 2008 https://doi.org/10.4271/2008-01-0325
- Fischer , O. , Kuthada , T. , Mercker , E. , Wiedemann , J. et al. CFD Approach to Evaluate Wind-Tunnel and Model Setup Effects on Aerodynamic Drag and Lift for Detailed Vehicles SAE Technical Paper 2010-01-0760 2010 https://doi.org/10.4271/2010-01-0760
- Mokhtar , W.A. , and Britcher , C.P. Boundary Interference of High Blockage Models in Open Jet Test Sections SAE Technical Paper 2008-01-1201 2008 10.4271/2008-01-1201
- Cyr , S. , Ih , K.-D. , and Park , S.-H. Accurate Reproduction of Wind-Tunnel Results with CFD SAE Technical Paper 2011-01-0158 2011 https://doi.org/10.4271/2011-01-0158
- Gleason , M.E. , Lounsberry , T. , Sbeih , K. , and Surapaneni , S. CFD Analysis of Automotive Bodies in Static Pressure Gradients SAE Technical Paper 2014-01-0612 2014 https://doi.org/10.4271/2014-01-0612
- Ljungskog , E. , Sebben , S. , Broniewicz , A. , and Landström , C. A Parametric Study on the Influence of Boundary Conditions on the Longitudinal Pressure Gradient in CFD Simulations of an Automotive Wind Tunnel Journal of Mechanical Science and Technology 31 6 2821 2827 2017 10.1007/s12206-017-0525-2
- Fu , C. , Uddin , M. , and Zhang , C. Computational Analyses of the Effects of Wind Tunnel Ground Simulation and Blockage Ratio on the Aerodynamic Prediction of Flow over a Passenger Vehicle MDPI: Vehicles 2 318 341 2020 10.3390/vehicles2020018
- Carlino , G. , and Cogotti , A. Simulation of Transient Phenomena with the Turbulence Generation System in the Pininfarina Wind Tunnel SAE Technical Paper 2006-01-1031 2006 https://doi.org/10.4271/2006-01-1031
- Stoll , D. , Schönleber , C. , Wittmeier , F. , Kuthada , T. et al. Investigation of Aerodynamic Drag in Turbulent Flow Conditions SAE Technical Paper 2016-01-1605 2016 https://doi.org/10.4271/2016-01-1605
- Stoll , D. and Wiedemann , J. Active Crosswind Generation and Its Effect on the Unsteady Aerodynamic Vehicle Properties Determinde in an Open Jet Wind Tunnel SAE Int. J. Passeng. Cars - Mech. Syst. 11 2018 https://doi.org/10.4271/2018-01-0722
- Li , Q. , Dai , W. , Zhong , L. , Yang , Z. et al. Effects of Reinjection on Flow Field of Open Jet Automotive Wind Tunnel test Section Journal of Applied Fluid Mechanics. 11 1 43 53 2018 10.18869/acadpub.jafm.73.244.27715
- Schönleber , C. , Kuthada , T. , Widdecke , N. , Wittmeier , F. et al. Investigation of Time-Resolved Nozzle Interference Effects Progress in Vehicle Aerodynamics and Thermal Management 110 131 2017 10.1007/978-3-319-67822-1_7
- Fischer , A. Hot Wire Anemometer Turbulence Measurements in the wind Tunnel of LM Wind Power Wind Energy Department, Technical University of Denmark 2012 978-87-92896-05-6
- Bartl , J. , Mühle , F. , Schottler , J. , Peinke , J. et al. Wind Tunnel Experiments on Wind Turbine Wakes in Yaw: Effects of Inflow Turbulence and Shear Wind Energ. Sci. 3 329 343 2018 10.5194/wes-3-329-2018
- Sebald , J. , Reiß , J. , Kiewat , M. , and Indinger , T. Comparison of Time-Resolved Experimental and Numerical Data in the Wake of a Full-Scale Passenger Car International Journal of Automotive Engineering 11 4 185 192 2020 2020 10.20485/jsaeijae.10.4_324
- Wickern , G. , and Lindener , N. The Audi Aeroacoustic Wind Tunnel: Final Design and First Operational Experience SAE Technical Paper 2000-01-0868 2000 https://doi.org/10.4271/2000-01-0868
- Weller , H.G. , Tabor , G. , Jasak , H. , and Fureby , C. A Tensorial Approach to Computational Continuum Mechanics Using Object-Oriented Techniques Computers in Physics 12 6 620 631 1998 10.1063/1.168744
- Shih , T.H. , Povinelli , L. , Liu , N. , Che , K.H. A Generalized Wall Function for Complex Turbulent Flows Proceedings of the 38th Aerospace Science Meeting and Exhibit Sponsored by the AIAA 2000
- Islam , M. , Decker , F. , de Villiers , E. , Jackson , A. , et al. Application of Detached-Eddy Simulation for Automotive Aerodynamics Development SAE Technical Paper 2009-01-0333 2009 https://doi.org/10.4271/2009-01-0333
- Collin , C. 2019
- Becker , S. 2009
- Wickern , G. , von Heesen , W. , Wallmann , S. Wind Tunnel Pulsations and Their Active Suppression SAE Technical Paper 2000-01-0869 2000 https://doi.org/10.4271/2000-01-0869
- Poletto , R. , Craft , T. , and Revell , A. A New Divergence Free Synthetic Eddy Method for the Reproduction of Inlet Flow Conditions for LES Flow, Turbulence and Combustion. 91 3 519 539 2013 10.1007/s10494-013-9488-2
- Evert , F. , and Miehling , H. Active Suppression of Buffeting at the Audi AAWT: Operational Experiences and Enhancements of the Control Scheme SAE Technical Paper 2004-01-0804 2004 https://doi.org/10.4271/2004-01-0804