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Simulating Semi-Batch Process (Change Velocity)

- July 16, 2026 at 10:27 am
  SR786
  Subscriber
  Hello,
  I am currently modelling a semi-batch precipitation process in an agitated vessel, where I have multiphase VOF (free surface tracking and volume tracking), SST k-w CC turbulence model, species transport (mass balance) and user defined scalars (population balance) with UDFs for source terms and I want to introduce a change by closing feed inlet boundary condition. I have a velocity-inlet (0.00877 m/s) for feed pipe face and pressure-outlet for top.
  As I understand there are two ways to do this:
  1. Change velocity-inlet to wall
  2. Set velocity-inlet to 0 m/s
  I tried the first option but it causes the solver to be very unstable and I cannot get reproducible results even with controlled time step size. Is the second option viable and what is the most robust way of going about this?

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