Fluids

Fluids

Why Pressure is too unrealasitc High??

    • AhmadMwaheb
      Subscriber
    • Aitor
      Subscriber
      Assuming that you have chosen velocity-inlet boundary condition at Inlet 1, the solver only uses the value of the velocity. The problem is overspecified if you set both velocity and pressure.n
    • Rob
      Ansys Employee
      You're forcing a fixed amount of flow through the system. Can you double check you're running axi-symmetric over 2d and that you have enough mesh to pick up any flow features. n
    • AhmadMwaheb
      Subscriber

      Assuming that you have chosen "velocity-inlet" boundary condition at Inlet 1, the solver only uses the value of the velocity. The problem is overspecified if you set both velocity and pressure.https://forum.ansys.com/discussion/comment/110324#Comment_110324

      So how can I solve the problem correctly? In
    • YasserSelima
      Subscriber
      Are you using Pressure-based solver?n
    • YasserSelima
      Subscriber
      The resolution of your velocity vectors shows that you have very coarse mesh. Being able to select velocity and pressure at inlet, probably you are using wrong solver.n
    • AhmadMwaheb
      Subscriber
      I don't get what you mean with picking up any flow features. I'm applying 2D axissymetric. The pressure is high because he want to equalizing the pressure at the the exit of the outlet (-20) ? should I make the inlet, pressure unlet and n

      You're forcing a fixed amount of flow through the system. Can you double check you're running axi-symmetric over 2d and that you have enough mesh to pick up any flow features.https://forum.ansys.com/discussion/comment/110328#Comment_110328

      give a value of the velocity as a dynamic pressure?n
    • AhmadMwaheb
      Subscriber

      Are you using Pressure-based solver?https://forum.ansys.com/discussion/comment/110706#Comment_110706

      yes preesure solvern
    • YasserSelima
      Subscriber
      Where did you set the 50 Pa pressure?n
    • AhmadMwaheb
      Subscriber
      At the inlet.n
    • AhmadMwaheb
      Subscriber
      SO I really need to know how to input both Velocity and pressure without making an issue? I was worng when I was putting 50 Pa as supersonic pressure.
    • YasserSelima
      Subscriber
      You can not have both velocity and pressure at the same boundary unless you have supersonic flow which is not your case. Set the inlet as velocity inlet, and the outlet as pressure outlet. But you need to refine your mesh. Probably you need 5 times this number of cells with inflation at the wall to get realistic values.n
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