any rule of thumb for cell size in rotary domain vs stationary

    • Sardar

      A rotary domain containing an impeller is inside a stationary one, all configured for sliding mesh method. The entire domain is to be meshed via ANSYS meshing. Should the mesh size for the rotary domain be different than that of the stationary one? Is it right to mesh the rotary coarser because the fluid adjacent to the rotor is going to move at higher velocities, hence larger/coarser cells are needed to capture fluid specifications in a given time step.

      I know there are other factors influencing cell size, like higher accuracy I might be interested in across a given area of my domain requiring finer mesh, and so on. However, what if I am not interested in any specific feature for any specific area of my domain? Should I mesh the rotary finer or coarser given the fluid velocity near the rotor?


    • Keyur Kanade
      Ansys Employee
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