Essentially, when simulating a block falling under gravitational constraints, Fluent will not remesh to give a new mesh after each time step, but will step in time until there are negative volumes and subsequently fail. I wonder if it has to do with my UDF defining the properties of the block or the way I created my mesh in Gambit, because it seems as though every other detail is identical to the tutorial.

thanks, philip

Check the volume in the Gambit. If it is showing negative volume Then mesh it by reducing the interval count.

I'm fairly certain that that isn't the problem, if I make the time step small enoungh, such that a couple of time steps can occur before the block in question crosses any cell boundaries (i.e. it only deforms the initial mesh without creating negative volumes). I do have the remeshing setting on and set to an interval of 1, so it seems like it should be remeshing. Anyways, thank you very much for your input; most appreciated.

Best regards,

-philip