Fluids

Fluids

Need help with a pipe flow simulation with pressure inlet and outlet boundary conditions

    • karoo178
      Subscriber

      Hello,

      My name is Khanh. I am trying to learn about different inlet and outlet boundary conditions in Ansys. However, I run into a problem with a made-up example where I tried to simulate a flow in a pipe with pressure inlet and outlet boundary conditions.

      The pipe dimension was: radius = 10 mm, and length = 20 mm

      The inlet pressure was 2 bar or 200,000 Pa and the outlet pressure was 1 atm or 101,325 Pa.

      I set the operating pressure at 101,325 Pa, inlet gauge total pressure 98,675 Pa and outlet gauge pressure 0 Pa. I used air at 20 C as the fluid.

      When I ran the simulation, the inlet pressure did not stay constant as I expected it should. Could anyone please help explain what is going on? I feel like I have misunderstood the physics very badly. Please help.

    • Keyur Kanade
      Ansys Employee
      Please use velocity inlet and pressure outlet boundary condition as it is most robust. Please go through help manual for more details
      Regards Keyur
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