scroll compressor: NOT REMESHING 2ND LAYER

Pedro ROS

Hello, I am working on a scroll compressor,2D simplest models as possible (I got 2models 1meshed in TRI the other one QUAD cells, STRUCTURED,PAVE, size function Proximity:cells per gap:2,grow rate:1.2,max:2mm; from walls. SMOOTH LAYERING A REMESH activated; Parameters, alike to those in the In_Cylinder tutorial, sizes equals to original ones in the compressor mesh.

The problem seems to be caused by the first layer of the mesh in contact with the moving spiral wall, which is modified, but for any unknown reason it is not splited nor collapsed to the second row of cells (both values alpha=0.5 ), so when the wall touches the second layer, the first one generates negative volumes, stopping the Mesh Motion Preview after 120 iterations (time step iteration 120e-05 seconds).

Questions:

_ Do you know why this is happening or how can I solve it?

_ Do I need a UDF to control the mesh? If so, wich one?

Any advice is really welcome, After a week working on it (and on the Fluent User's Guide) with no results I am pretty lost.

Thanks in advance to any of you.

Regards,

Pedro ROS