3D Design

3D Design

Modeling a fan inside a box

    • jfonseca662
      Subscriber

      Hello,


      I have a box that can be cooled with an embedded fan. I have the fan characteristic curve (dPvsAirflow) and it is not my intention to simulate the rotation of the blades, only the airflow caused by a given pressure drop.
      I already understood the BC relative to the calculations, but I have some doubts about how to represent the geometry of the face.


      I will perform a 3D simulation of the box, with the fan in one of the faces and external air to the box. if possible, I may apply symmetry in which the axis divides the fan exactly in the middle. Should the fan be represented with only a surface? Should I give some depth to that surface? If so, I am not sure how to define this solids and the respective surfaces of the boundary conditions.


       


      Thank you very much for any answer. 

    • Rob
      Ansys Employee

      Fan is a thin surface, which must be defined at the geometry creation stage. Remember, fans cause swirl, so how would this react with a symmetry plane? 

    • jfonseca662
      Subscriber

      Thank you for remembering me about the swirl. That may affect a lot the flow as the box I pretend to simulate as some components inside a near the fan. 


      Below is an image of what I pretend to simulate. Purple rectangles are inlets and the half circle (in the future full circle) is the outlet fan.


      Being the fan a surface, it means that the box enclosure also needs to be a surface, correct?


       

    • Rob
      Ansys Employee

      Yes. I'd split the box out as a volume and then imprint the fan & slots (read up on interior and internal faces) for this to simplify meshing. Use Named Selections in Ansys (Workbench) Meshing. 

    • jfonseca662
      Subscriber

      Ok, Thank you very much

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