[rsaurabh]

Hi all,
i am doing a 2-d simulation where inside my geometry there are two rotating parts. both are rotating about their centre of rotation separately about Z-axis. i have compiled my udf successfully but when i am running my simulation it is giving me error of negative cell volume. i have tried to reduce time step size. but it is not helping.

in defining dynamic zone i have defined separate centre of gravity for both parts but when i am seeing them after dynamic meshing failure they are reaching to one particular points.

here i want to rotate them in different direction. one in clock wise and other in ccw. i am attaching my failure mesh image here.
any help would be appreciable.
thanks in advance


regards
saurabh