How to avoid deformed moving zone for MDM with non-conformal interface
When creating non conformal interface for surfaces which has boundary nodes at the same location, by default FLUENT will merge the boundary nodes. Therefore for Moving-Deforming mesh (MDM) problems, the boundary nodes of moving zone will not move. For simple layering problem one can see a moving zone deformed at the boundary, but for remeshing, mesh preview may fail and very small time step is required to avoid the failure of mesh motion preview.
For MDM problems with non conformal interface, whenever you have interface zone with boundary nodes exactly at same location (matching boundary nodes within tolerance limit), before creating non conformal interface use following rpsetvar command to prevent FLUENT from merging the boundary nodes
(rpsetvar ' nonconformal/force-shared-nodes-to-boundary 0)
default value of this rpvar is 1
Two animated gif files are attached to this solution
1) With default value i.e (rpsetvar ' nonconformal/force-shared-nodes-to-boundary 1 )
File name --> anim-sol-953-before-rpsetvar.gif
One can see a large deformation of moving zone at the boundary of interface.
2) With default value i.e (rpsetvar ' nonconformal/force-shared-nodes-to-boundary 0 )
File name --> anim-sol-953-after-rpsetvar.gif
Large deformation of moving zone at the boundary of interface is avoided using this rpsetvar value.