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Fluids

Residuals of continuity not converging

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    • shashank.sharma
      Subscriber
      Dear Connections,
      I face convergence issues while dealing with UDS and UDF codes, defining source terms and additional equations to track coal consumption during combustion and gasification.
       
      Thank you,
       
      Sincerely Yours,
      Shashank Sharma
    • Nikhil Narale
      Ansys Employee

      Hello Shashank, is this a transient case? 

    • shashank.sharma
      Subscriber

      Dear Nikhil, Yes, it is a transient case.

    • Nikhil Narale
      Ansys Employee

      Can you please post the screenshot of the residuals? 

       

      Can you also try increasing the number of iterations/time step and/or reducing the time step size, if not already tried? 

    • shashank.sharma
      Subscriber

      Dear Nikhil,
      Thank you very much for your suggestion. Please find the attached Residual plot. I have increased the no of iterations/time step to 25; I will try reducing the time step size. 

    • Nikhil Narale
      Ansys Employee

      Thanks for sharing. Let me know if that works. 

      Additionally, can you also track and monitor mass imbalance in the system?

    • DrAmine
      Ansys Employee

      Transient: you need to track the accumulation in system to check if mass is conserved or not.

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