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2D Ground effect for car+airfoil configuration

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Old   July 31, 2022, 04:47
Default 2D Ground effect for car+airfoil configuration
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Dear all,
I'm working on the evaluation of the 2d aerodynamics of an ahmed body profile (serving as a car profile) with a detached airfoil generating downforce. I'd like to run Rans simulations with SA turbulent model. I'm having a hard time to obtain a stable and converging simulation after trying all the options I found in this forum related to ground effect and moving walls.
My mesh consist of a rectangular domain in which (wrt to the car) front, back and top sides are called FARFIELD, the bottom side that i want as a moving wall is called ROAD. inside the domain there are the CAR (ahmed body) and the WING (the airfoil).

I obtained this cfg file from a working simulation that doesn't have any moving boundary and these are the modification I added to it, but probably something is wrong within them.

% -------------------- BOUNDARY CONDITION DEFINITION ------------------
MARKER_HEATFLUX= ( WING, 0.0, CAR, 0.0, ROAD, 0.0)
% ----------------------- DYNAMIC MESH DEFINITION ----------------------

SURFACE_TRANSLATION_RATE= (55.4526, 0.0, 0.0)

Mach number at the back of the car increases drastically, especially near the FARFIELD boundary.
Is there someone with a similar case that can share a config file or show me where i'm mistaken?
I will attach the entire config file.
Thank you in advance for the help and sorry for the long post.
Attached Files
File Type: txt CAR_GROUND_SA.txt (9.0 KB, 3 views)
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car aerodynamics, ground effect, moving wall, su2

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