Practical Aerodynamic Simulations (CD, CL, CYM) Using a Turbulence Model and 3rd-Order Upwind Scheme 950629
Conventional aerodynamic simulations have been carried out by using Supercomputer and over a hundred thousand grid points. It takes a long CPU time to get a result. So this method has been mainly used as a research and demonstration tool.
In this paper a practical aerodynamic simulation for early phases of the automobile design is presented. This new method basically uses the conventional (wall function used) k-ε turbulent model which is regarded as the most promising in engineering and industrial fields.
Firstly, the third-order upwind scheme is introduced to the convective term to improve flow field and pressure distribution. Secondly, the modified turbulent energy production method (M.P.Method) which was proposed by B.E. Launder[3] in 1993, is introduced to the k-ε turbulent model to reduce the excessive generation of turbulent kinetic energy.
It takes 20 hours to generate a computational mesh from design CAD data by a new semi-automatic mesh generator and 10 hours to get the steady flow result by using EWS (IRIS Indigo2 R4400, 1CPU).
It takes only 4 days to get an aerodynamic solution within an error of 5% for CD (Drag Coefficient) and CL (Lift Coefficient). This new method has been applied to the aerodynamic simulation system, a designer has been able to carry out the practical simulation on early designing phase of an automobile.
We also present a CYM (Yawing Moment Coefficient) simulation between 0 and 45 degree and the influence of a outside rear view door mirror on Two-Box automobile.
Citation: Okumura, K. and Kuriyama, T., "Practical Aerodynamic Simulations (CD, CL, CYM) Using a Turbulence Model and 3rd-Order Upwind Scheme," SAE Technical Paper 950629, 1995, https://doi.org/10.4271/950629. Download Citation
Author(s):
Kenji Okumura, Toshihiko Kuriyama
Pages: 15
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Investigations Into Vehicle Aerodynamics-SP-1078, Vehicle Aerodynamics-PT-49, SAE 1995 Transactions: Journal of Passenger Cars-V104-6
Related Topics:
Turbulence
Drag
Aerodynamics
Simulation and modeling
Wind tunnel tests
Design processes
CAD, CAM, and CAE
Mirrors
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