[lauren111f1]

Hi all,
I'm new to CFD and have been trying to create a 3D wing for a Formula Student car in ANSYS Fluent. I have managed to make the 3D simulation without ground effect but now when I make the same design but add in ground effect it doesn't seem to work, I think there may be interference between the mesh of the body of influence and the main mesh, would anyone be able to take a look? If so, I can upload the file?
Kindest regards,
Lauren

[shereez234]

Ground needs to be resolved with boundary layer with Y+ less than 10. Ground also needs to be set as a moving wall with free stream velocity

[PayarRadfar]

Originally Posted by shereez234

Ground needs to be resolved with boundary layer with Y+ less than 10. Ground also needs to be set as a moving wall with free stream velocity

Not Necessarily, It is heavily dependent on what turbulence modelling you are using.

For instance:
S-A needs Y+< 5 and is good for wall bounded situations and turbo machinery etc.
K-omega Y+<5 and is good for High Reynold Number situations etc.

There is lots you can read on advantages of each of these modelings which you need to understand.

You definitely need to have a boundary layer on ground and try to get y+ as small as you can. You can use y+ calculator to avoid wasting time on try and error kind of approach.

Let me know if you need more assistance but ANSYS help providesenough information (both theory and user manual).

[shereez234]

Originally Posted by PayarRadfar

Not Necessarily, It is heavily dependent on what turbulence modelling you are using.

For instance:
S-A needs Y+< 5 and is good for wall bounded situations and turbo machinery etc.
K-omega Y+<5 and is good for High Reynold Number situations etc.

There is lots you can read on advantages of each of these modelings which you need to understand.

You definitely need to have a boundary layer on ground and try to get y+ as small as you can. You can use y+ calculator to avoid wasting time on try and error kind of approach.

Let me know if you need more assistance but ANSYS help providesenough information (both theory and user manual).

Keeping in mind SA and K omega SST models are most used for aerospace simulations. I don't know your point when you said "not necessarily"