[axz242]

Hello,

I am trying to model a rotating 3D chamber with air inside to make artificial gravity. I noticed there was an unexpected circulation of air inside so I simplified the problem to try and find any mistakes.

In the simplified problem I still see this unexpected result.
My simplified problem is a 2D 40cm-diameter circle rotating at 5.72 rad/s. The inside is air and the edge is a wall.
Running it in steady state with no gravity I expected the relative velocity magnitude to be 0 throughout since I have no reactions/inlets/outlets but I get the following results as seen on the images.

Am I missing something?

NOTE: The rotation is done through frame motion of the cell zone.

Thanks,
Arland

[MekTek]

Could this be due to the viscosity of air? May be the layer of air closer to the wall moves along with the wall greater than the layer of air further towards the center?