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Natural convection transformer cooling ducts

    • May 21, 2024 at 1:58 pm
      Lukas Henninger
      Subscriber

      Hello guys, 

      i have a problem here, maybe anyone can help me out. In the left picture you can see the fluidvolume of a transformer with cooling ducts. I want to simulate natural convection on there. I gave the walls Energy sources and want to simulate the flow of air. I the other faces are openings, online the outer left one is a wall. Inbetween the cooling ducts, the faces are walls too. The probleme here is now, that the air is flowing downwards, which is not correct in reality. I added buoyancy. Anyone sees the problem?

       

    • May 22, 2024 at 3:12 pm
      CFD_Friend
      Ansys Employee

      Hi,

      Can you check if the geometry is aligned upright (that is gravity will be acting in the proper -ve z direction)?

    • May 24, 2024 at 6:20 am
      Lukas Henninger
      Subscriber

      Hey @CFD_Friend, i already found the problem. The density was not right. But now the question, why did this happen, with a density being to low in the domain. For the openings i selected reference Temp. 25°C. Did CFD calculate the density of the air, which is coming is from the opening? Being of  higher density it would "fall" in my domain. Is this the right assumption?

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