hi all i am getting a negative volume in an unsteady state simulation of a bearing air-gap. i am using a cg motion udf for a shaft.

whats the remedy?

Dear Rishikesh Try to use smaller time step size. Regards. Mustafa Ayad

smaller time steps would work but after some iterations it would again come with negative volume so just check your mesh and also the geometry before u do the problem..but try using smaller time steps it would work atimes.. regards hari