5 Replies Latest reply on Nov 7, 2016 3:23 AM by Ahmad Aufar

    Boundary conditions, pressure or flow?

    Jared Hansen

      Hello.

       

      I do have a fire hose nozzle.

       

      I'm trying to model the trajectory for the water beam, and needs the speed of the water when it leaves the nozzle.

      To determine the speed, i'm trying to use SolidWorks Flow Simulation.

       

      I know the inlet pressure, and the flow at that pressure. It runs into free air, but i think it will be wrong to presume that the pressure at the exit lid will be 1 bar.

       

      I have tried to run different simulation. I have tried to set:

      - Inlet pressure to 7 bar, and outlet pressure to 1 bar.

      - Inlet flow to 0.035 m^3/s and outlet pressure to 1 bar.

      - Inlet pressure to 7 bar, and outlet flow to 0.035 m^3/s.

       

      What I actually want is to set both the inlet pressure and inlet flow, and let it calulate the outlet pressure based on the known flow.

      But it is not possible to set to conditions on the same lid.

       

      What I want is an average speed of the water when it leaves the nozzle.

      The thing here is also that this particular nozzle has a "tip" within, that squeezes the fluid to the sides.

      I will attach a photo of the geometry.

       

      Hope that anyone has an idea for what boundry condition and goals I should use to get a correct result.

       

      Jared