[REJISH]

Hi team,

I would to use SU2 for aerodynamic simulation of ground effect wing.
It seems that moving wall boundary condition is not available in SU2.
If it is available, could you please point me to the direction where I can see further details to use moving wall boundary condition in SU2.

Best regards,
Rejish

[pcg]

Hi, see TestCases/moving_wall/cavity

[REJISH]

Hi,

Thank you very much for your reply.
In the latest version, they have only .su2 file in the folder TestCases/moving_wall/cavity. They don't have the configuration file (.cfg) in the folder.
If you have the .cfg file for the above mentioned case, could you please share it?

Thanks again for your time.

Rejish

[REJISH]

Hi,

I found the configuration file inside the SU2 folder. They separated the meshfile and the configuration file.

thanks

[jdp810]

Hi Rejish,

take into account that the moving wall boundary condition is only useful for ground effect IF there is wind or if for some reason, the ground is moving relatively to the air mass. The moving wall boundary condition by itself will not give you any ground effect.

JD

[REJISH]

Hi JD,

Thank you very much for your reply.

If I understood correctly, to capture the ground effect, the ground should be considered as wall and should move relative to the air mass.

In SU2, we can specify the lower_surface (below to the wing) as moving wall with translational velocity in the freestream direction and then consider both wing_surface and lower_surface as wall using MARKER_HEATFLUX. I am using RANS simulation here.

Simple demonstration is shown below,
Let me know if I need to change any other parts in .cfg.

% ----------------------- DYNAMIC MESH DEFINITION -----------------------------%
%
% Type of dynamic mesh (NONE, RIGID_MOTION, DEFORMING, ROTATING_FRAME,
% MOVING_WALL, AEROELASTIC, ELASTICITY, EXTERNAL)
SURFACE_MOVEMENT= MOVING_WALL
%
% Motion mach number (non-dimensional). Used for initializing a viscous flow
% with the Reynolds number and for computing force coeffs. with dynamic meshes.
MACH_MOTION= 0.1
%
% Moving wall boundary marker(s) (NONE = no marker, ignored for RIGID_MOTION)
MARKER_MOVING= ( lower_surface )
%
% Translational velocity (m/s) in the x, y, & z directions
SURFACE_TRANSLATION_RATE= 33.179 0.0 0.0

% -------------------- BOUNDARY CONDITION DEFINITION --------------------------%
%
% Navier-Stokes wall boundary marker(s) (NONE = no marker)
MARKER_HEATFLUX= ( wing_surface, 0.0, lower_surface, 0.0 )


Thanks again for your time and consideration.

Best regards,
Rejish

[jdp810]

Only if you are worried about the boundary layer. If your height is higher than the boundary layer (which I may have assumed incorrectly), the wall velocity shouldn't change the results much. Check if the boundary layer height compares to the distance of the object to the wall and if not, you may use the wall assuming it is an Euler wall or symmetry