Internal surface / wall

[s.r.walker]

Good morning,

I hope someone can help me with this question... I've done a fair bit of CFD but I'm not very experienced with Simulation Multiphysics yet.

I am trying to model a turbine in water, so I have a simple 3D box, with a 2D disc floating in the middle of it. I want to set a velocity at the inlet to the domain, roughness on the floor, and outlet at the other end. I can do this fine, but what I can't do is set the 2D turbine disc as a pressure defacit or semi-permeable surface.

My box is part 1, and the disc is part 2. I have set the meshing setting to "Part", and part 2 as a plate / surface, but I would imagine I need to specify this surface as an internal wall with mesh both sides. Currently the model reports errors when I try to mesh it.

So, the question - how do I define a surface as a 2D internal surface, and then define a pressure defacit on it?

Thanks very much,

Stu

PS. Have attached a screenshot in case this helps!

[Joey.X · Accepted solution]

You can define internal fan boundary condition (flow rate or velocity BC) on the "2D disc", which should be surface(s) of some part, note that the whole modeling should have matched pair surface(s) on other part, you don't need to define anything on the pair surface, the pressure drop on internal fan/turbine depends on the surrounding environment, software will take care of them in runtime computation.

Btw, refer to document for more details of simulation Multiphysics internal fan BC. 

[s.r.walker]

Thanks. It appears to be working now.