Fluids

Fluids

Pseudo transient

    • sharm2a2
      Subscriber

      Hello everyone,


      What is the difference between pseudo transient simulation and transient simulation?


      When to use pseudo transient ? I know about the transient simulation but pseudo is bit confusing. If we want to run pseudo we have to run as a steady which confuses me as since it is steady state than why transient in it.


      Please help. 


       


      Thanks

    • Keyur Kanade
      Ansys Employee

      Hi, 


      Pseudo transient  is a form of implicit under-relaxation for steady-state cases. It helps in stabilizing the case and at the same time gives faster convergence. Please see help manual for more information. 


      Regards,


      Keyur

    • Keyur Kanade
      Ansys Employee

      Moving to fluid dynamics category. 


      Regards,


      Keyur

    • seeta gunti
      Ansys Employee

      Given more information from the document. 



       


      For the set up,  you can go through  our user guide section 28.13.


       


      Regards,


      Seeta

    • denispansolin
      Subscriber

      Hi guys,


      I am doing a simulation with Turbulent and compressible Hydrogen (Internal Flow) in 3-Dimensions.  I m doing it using Pseudo Transient Time. My residual after 200 iterations becomes flat. Is that normal? When I run it steady state ( no Pseudo Transient) the iterations go up and down forever. Can someone explain to me why in pseudo transient they become flat so soon?? 


      Thank you for your help !!!!


       

Viewing 4 reply threads
  • You must be logged in to reply to this topic.