Single moving reference frame
I have two walls and fluid in between where the upper wall is inclined. The lower wall is moving and the upper wall is stationary. As the lower wall is moving I thought I should use a single moving reference frame. I defined fluid cell zone as moving frame but zero absolute velocity, because I want to see fluid should be dragged because of lower moving wall. And inlet and outlet BC are pressure-driven. My question is as the upper wall is stationary, then should I define simply stationary wall or I should define moving wall with zero velocity.
Comments
You don't need moving frame. In the boundary conditions, define the lower wall as moving wall and give it the wall velocity.
Just note, you need to refine the mesh near the walls in your domain. Use inflation
thank you so much for the clarification. if I have a solid cylinder in between which is stationary then it will give correct flow conditions. what you will suggest in this condition.
If you have only one wall moving and its motion is not perpendicular to the mesh, i.e parallel , you don't need to use moving frame nor dynamic mesh .. just enter the wall velocity in the boundary conditions