4 Replies Latest reply on Sep 16, 2010 8:11 AM by Stefan Wozniak

    Internal Fan modeling

    Nilesh Desai

      Hi all,

       

      (1) What is the best Solidworks model representation for internal fan? This fan is way inside the chassis and not near the inlet/outlet of the chassis.

      (2) What has precedence? Fan geometry or Fan data and other related info?

       

      Thank you in advance.

       

      Best Regards,

      Nilesh Desai

        • Re: Internal Fan modeling
          Bill McEachern

          use the internal fan option and just make sure that the flow areas are about the same between the real fan (area between OD & ID) and the solid you use to represent it. That way the inlet & exit velocities are about right.

            • Re: Internal Fan modeling
              Nilesh Desai

              Bill,

               

              Thank you for your suggestion. I have done similar thing with rectangular block and two circular sketches defining OD and ID and then splitting both the faces of rectangular geometry to represent inlet and outlet of the internal fan. what is not clear is whether geometry takes precedence or the HUB Dia and RPM fan related data we generally supply.

               

              Best Regards,

              Nilesh Desai

                • Re: Internal Fan modeling
                  Bill McEachern

                  Huh? You put in a flow rate vs pressure drop characteristic so that is what you are going to get. If you want the velocities to be about right then you need to have similar areas. The RPM just affects swirl as far as I know. There is no spinning fan - it is just a BC. The flow exits the flow domain on one side and a flow is injected on the other side consistent with the curve you input and it will have the same average temp if so specified.

              • Re: Internal Fan modeling
                Stefan Wozniak

                Modeling 3D model of fan is very complex and flow calculations can take very long time.

                The simpler way and much faster is applying inerFan BoundaryCondition. If you have fan data (in industry solutions you don't have fan data only if you designing fan on your own) it's better way to use fun curve instead of modelin fun blades.

                 

                Some fan geometry data are independent from model and are stored in fan definition. ie. inside area with no flow thru it.