Fluids

Fluids

Bloodflow simulation in the arterial tree of the kidney

    • ltenverg
      Subscriber

      Hi, 


      I am trying to simulate the bloodflow through the arterial tree of the kidney. 


      As inlet I'm using a velocity BC and at the outlets outflow BC's. 


      However after running the simulation (SIMPLE) I get higher pressures at the outlets than at the inlets, this is not realistic. 


      I checked that the flow is going in the right direction. 


      Does someone now what might have gone wrong? 


      Thanks in advance! 

    • RK
      Ansys Employee

      Hello,


      Can you please insert the picture instead of attaching it so that we could understand what is going on better. We will not be able to see attached files. Thanks. 


      Regards, 


      Rahul 

    • ltenverg
      Subscriber

    • Rob
      Ansys Employee

      Don't use outflow as it's trying to force equal flow over all branches, use a pressure boundary. If you do know the flow in each branch use a negative velocity boundary on the outlets & pressure inlet. Also note, that you're showing skin pressure, so that may be a result of flow separation & impingement. 


       

    • ltenverg
      Subscriber

      I determined the outflows according to Murray's law (based on the diameter of the branches). What do you mean with a negative velocity boundary on the outlets? 


      Thanks! 

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