Fluids

Fluids

Reverse flow on 2000 faces of Pressure Outlet, Divergence detected in AMG Solver- OPEN CHANNEL

    • tumulpurwar
      Subscriber
      Hi , i am getting reverse flow,if i simulate external flow dynamics at pressure outlet for Multiphase flow(Air + water) under STEADY STATE..please note if i simulate thsi same problem in TRANSIENT STATE, the problem dont come more..I am curious why it is so.
      I dont want to incresae more domain size to increase outlet distance...I saw in Ansys guide, information below, but this command is not able to execute if i try in my command window.
      Can anyone help please.
    • DrAmine
      Ansys Employee
      Which steady state solver are you using? Open Channel flow reversal of gas phase can be physical. Generally open channel flows are inherently transient which might end in pseudo steady state .
    • tumulpurwar
      Subscriber
      ok..SIMPLE
    • DrAmine
      Ansys Employee
      Use coupled pseudo transient.
    • tumulpurwar
      Subscriber
      OK THANKS
    • tumulpurwar
      Subscriber
      Hi DrAmine
      Do we just rely on COMPUTE FROM "Input", for these 2 red boxes, or do we need to put by ourself?
      In case of hull, Area will be wetted surface area and Length will be length of hull..Right?
      Do these reference value Solver use to do calculation?
      Please if you could let me know.
      Also what we have to put in red box below in Photo, i mostly put value = 1,the photo is from Ansys tutorial, why they putting -.0534..
      Please if you could explain me..Thanks


    • DrAmine
      Ansys Employee
      Reference values are only fir post processing
    • tumulpurwar
      Subscriber
      ok thanks..Could you please answer my second query..could be stupid query but i wanted to know..thanks
    • DrAmine
      Ansys Employee
      Values are nou used when solving
    • tumulpurwar
      Subscriber
      ok thanks
    • tumulpurwar
      Subscriber
      hI DrAmine
      PSUEDO WITH COUPLED NOT WORKING EITHER IN STEADY STATE CASE....NOW I AM USING TRANSIENT ANALYSIS...WOULD YOU LIKE TELL ANY MORE SOLUTION IN WHICH IT CAN RUN IN STEADY STATE?..thanks
    • tumulpurwar
      Subscriber
      Hi DrAmine
      Can you tell, i have 4 core fluent license, how much maximum mesh element size commercial Ansys fluent can accept?
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