[Ryuzaki]

Hello,
I am trying to analyze a wind vane that will move freely under aerodynamic loads. However, during the analysis, at some time steps, my entire overset volume becomes dead cell. In the next time step, the problem may be vanish. However, in the time step when the overset volume consists of dead cells, there is a dramatic increase in the aerodynamic loads on the wind vane. This causes my overset volume to move incorrectly. Can anyone give me any suggestions to overcome this problem?

When I read the manual, I realized that this problem might be a "flood fill" problem, but I could not find any way to solve it.

thx in advance...