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Time step not converging in Transient simulation with RPI Wall boiling

    • Manish Patel
      Subscriber

      I am trying to simulate subcooled flow boiling in horizontal channel with Non-equilibrium RPI wall boiling model. It is transient simulation with Implicit scheme. Steady state simulation are not giving the true results so that scenario is already discarded. I have already performed grid independency and now trying to do time step converging for transient simulation. Started with time step of 5E-02 and reduced upto 1E-05. But, the results keep changing everytime. The results have shown to match when time step is arounf 5E-02. With smaller time step, I am not even seeing boiling starting.

      So, please help me how time step convergence can be achieved? 

      The models and schemes are listed below. 

    • Prashanth
      Ansys Employee

      Hello, what is the y-plus values near the walls of interest when you change the timesteps? Also, which Fluent release are you using?

    • Manish Patel
      Subscriber

       

      The y+ valus is 30. I am using Ansys 2021 R1. 

       

    • Manish Patel
      Subscriber

      Can I get some input to solve the problem i am facing? 

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