I'm doing 3000rpm drone propeller computation on ansys fluent. First 1500 iteration steady state mrf zone is computed with SST k-w turbulance model. After convergence is done i change it to transient DES model to capture acoustic datas.

Created zone is divided two equal peace to create periodic condition.

My first question is that what is the correct time step size to calculate transient simulation of rotating propeller (with sliding mesh).

Secon is that why my interior zone is corrupted while iteration progress. Is it releated to timestep size?

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