Fluids

Fluids

Outlet boundary condition for pipe flow

    • birbara2
      Subscriber

      Hello I am considering a problem where I have a square pipe that has a given inlet velocity and I want to assume a profile for the outlet velocity. How can I specify that on the outlet? also what is the difference between outflow and outlet vent ? what are the physics behind it?


       


      Thanks

    • Karthik R
      Administrator

      Hello,


      Why are you trying to assume an outlet velocity profile? What is the purpose of your simulation?


      About the difference between outflow and outlet vent:


      Outflow - Outflow boundary conditions can be used at the outlet of open channel flows to model flow exits where the details of the flow velocity and pressure are not known prior to solving the flow problem. 


      Outlet vent: Outlet vent boundary conditions, as the name indicates, are used to model an outlet vent with a specified loss coefficient and ambient (discharge) pressure and temperature.


      You should be able to read more about these BCs on the ANSYS Fluent Users guide (Section 6.3 'Boundary conditions', R18.2).


      I hope this helps.


      Best Regards,


      Karthik

    • birbara2
      Subscriber

      Basically it is a condensation and evaporation problem. As we evaporate at a certain rate, we get a velocity of vapor. I know the evaporation rate but I don't know the condensation distribution on the other side. So I want to check different profiles at the exit since I don't know that. Do you think I can do that? Also, is the outflow solution UNIQUE? or is it one solution


       


      Thanks

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