Fluids

Fluids

Ansys Fluent Setting Up Natural Convection Boundary Condition

    • nguy3394
      Subscriber

      Say I have a acrylic rod that have a volumetric heat source at one end, and all the other surfaces are exposed to still air at room temperature. How do I setup the wall boundary condition correctly for this natural convection? When running the calculation, it is always the case that the rod temperature rise up infinitely without ever reaching a steady state. Thank you.

    • Rob
      Ansys Employee

      The wall boundary condition looks feasible. Have you turned on gravity and a temperature dependent air density? 

    • nguy3394
      Subscriber

      gravity is on. Do I have to model an air block completely encasing the rod?

    • Rob
      Ansys Employee

      If you want to model the buoyant flow around the rod. Otherwise, a convection boundary on the "wet" faces should be OK if you can find the heat transfer coefficient. 

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