[akhi2908]

I am trying to solve a simple transient fluid flow in which fluid is flowing over a substrate ("wall" at the bottom) and its free surface is coming in contact with a curved roller surface which is not moving [Refer to figure: Slide_1] After a few time steps it is observed that the fluid stacks up at one of the free surfaces and there is no deformation of the mesh below the roller (curved surface) as now fluid enters the gap between the roller and the substrate [Refer: Slide_2]. The simulation fails to converge as the other meshes are distorted further.

Please help me understand what needs to be done to make the fluid flow through the gap. Thanks!

[akhi2908]

If any body has any hint on why it might not be working please comment. I have tried all I could bt still cant change result.

[natalie]

Hi, akhi!

I'solving practically the same problem? Have you dealed with it? Any ideas?

[akhi2908]

Hey natalie

I needed to split the domain into many parts, mesh them separately and then define as one domain. Also, the boundary conditions on the free surface needs to be selected carefully.

[natalie]

but how have you made these edges between two zones not to go upstairs? and did the interfaces between different domains work properly?

thanks for your reply

[akhi2908]

Once the setup was defined as a single body, there wasn't any problem of flow b/w two domains. I think there might be something wrong with the boundary conditions. Try increasing the slip on the roller. Playing around with the setup a bit might give you more ideas.

[natalie]

Thanks for your help!