Dynamic mesh PROBLEM!
 

Hi,
I have a problem with the dynamic mesh, and i don't know how to solve it , every thing is shown in the picture below.

(I have already tried everything like increasing or reducing spring factor, using size function in remeshing method and ... but nothing seems to fix this problem, i think the problem can be fixed if there is a method which increases the number of mesh nodes on the boundaries in each time step! is it possible by writting a UDF??)

By the way, the udf used for moving the top wall is DEFINE_GRID_MOTION.

plz help me.

hi
 

did you solve your problem?
i have same problem like you, please help me!!