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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › VOF evaporation problem › Reply To: VOF evaporation problem

November 22, 2023 at 5:30 am
not.lah.enough
Subscriber

Reverted back to 2D model to allow refinement at the center of the domain. Here’s the mesh structure around inlet, with size of 0.006 m.

 

The simulation worked well at first (I used small time step of 0.0001 and adaptive time step to speed up the calculation later on), which was sufficient for a while), until the vaporization stated to kick in. As soon as some vapor built up, the Courant number shot up to above 250 (perhaps due to sudden surge of vapor formation?), as well as the residuals, which resulted in the simulation to crash.

Is there any way to automatically decrease the time step as soon as the solver detects such sudden changes (so I don't need to stick to something like fixed very small time step, which may take a very long computational time), or any other workaround in this case?

 

 

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