Fluids

Fluids

How to set time step for a liquid-gas VOF with dynamic mesh

    • Hoss
      Subscriber

      In this axisymmetric domain, to squeeze the liquid bridge between two walls, a sinusoidal motion was defined for the left wall as a "Rigid Body" via a UDF.
      While the period of the wall motion is ~6 sec in the UDF, the variable timestep based on a courant number of 0.25 is in the order of 1e-8 which makes the solution extremely long. A larger fixed TS will result in divergence. How should I set the TS reasonably?


       


      Thank you!


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