Uniform Flow in distributed resistances

[f.wolfenstetter]

Hello,

I have problems simulating incompressible flow through a volume resistance material. The gas enters a vessel through an inlet device at the side and leaves the vessel at the top end after passing a wire mesh, which produces a pressure drop. I have modelled this porous wire mesh as a volume resistance using a constant K value for all directions, because I know the pressure drop this element produces.

The problem is the flow seems to be uniform as soon as it enters the resistance. The velocity components in y and x directions are 0 inside the resistance material. How can there be no velocity components in x and y direction if the pressure drop is equal in all directions and the flow is not uniform when it enters the resistance?

Do I have to use a different type of resistance for my model?

Thanks for the help,

Flo

[Jon.Wilde]

Hi Flo,

Try running with this Flag (Setup -> Design Study Tools -> Flags) DRsmoothing set to -2.

There is an article here on DRsmoothing

Kind regards,

Jon

[f.wolfenstetter]

Hello Jon,

thank you for the help. This works quite well, although I think I have to increase the K factor in the normal directions a bit to get the desired results.

Thanks for the quick support.

Kind regards,

Flo