hi guys,

I was wondering if it would be possible to define an one-directional flow in Star-CCM+?

suppose there is a boundary and I want to restrict the flow only in x-direction? in other words, gas/liquid can flow only in (+X) direction through this region not in (-X), (Y) or (Z) directions.

Is that possible to use or define a new Field-Function or use any user-code to do that, appreciate any help and feedback?

Thanks,

Use porous media

flow in porous media can be in either direction - I tried that!

Let me correct my comment! I want to have flow in (+X) direction and not (-X) - what if I had back-flow!

Is that physical?

if that is a boundary, yes.

Say the gas should flow through this face only in +X and there should not be -X flow. I guess it is possible at Star-CD with some user-coding and want to know if that is possible at CCM+ as well.

Why can't you just specify a fixed velocity boundary in the x direction

suppose I have a geometry like this:

-> (N2) inlet--------------------------------->(N2) outlet

------------------ (boundary in between)-----------------

-> (CO) inlet--------------------------------->(CO) outlet

CO cannot pass through the boundary and go to the upper side (i.e. N2 side) but N2 can pass through the boundary to go to the lower side (i.e. CO side)!!!

Ok I see what you mean now, it was a little tricky to visualise! porous baffle maybe? best ask your support people!