Lobe Pump Analysis
 

I am facing error in Mesh Motion in Fluent,


Warning : non-positive volumes exist.

Error: Update-Dynamic Mesh failed. Negative cell volume detected.
Error Object : #f

Another Problem is for what we locate POINT ON PLANE and PLANE NORMAL?http://www.cfd-online.com/Forums/www...1&d=1426699855http://www.cfd-online.com/Forums/att...1&d=1426700690

To avoid the 'Negative Cell Volume' you can use a smaller time-step. Time-step small enough so that the distance covered is smaller than the size of the smallest element. You can also play around the dynamic mesh parameters to have a better mesh after each time step.

If you have selected the side faces as symmetry, you can just leave them for now.

Sir the side faces are defined as DEFORMING MESH ZONES as PLANE.

I took time step size as 5e-4 and number of time steps as 1000.