Electronics

Electronics

Topics related to HFSS, Maxwell, SIwave, Icepak, Electronics Enterprise and more.

Fan operating point and system resistance Icepak

    • Noelly
      Subscriber

      Hello,

      I am modeling the following system that has a chip with a heat sink attached and a 3D fan. The faces on the left and right sides on this figure have openings. I am using Standalone Icepak in Ansys 2021, I have the following questions:

      1. Is it possible to specify a volumetric flow for the fan? The fan curve has been inputted but the CFM input box is greyed out and it looks like only a single point is calculated/used from that curve. Is the volumetric flow only calculated by Icepak based on the system resistance, so no way to input a fixed value?
      2. How is the system resistance calculated in general (so for instance with obstacles in the flow direction such as heat sinks, or with energy loss to friction at the wall) and in particular in a case where I have openings in the system (how are these openings boundary treated)?
      3. I had tried another case with a 2D fan on the boundary, is there a way to output the pressure drop? It does not show up in the solution overview file unlike the 3D fan case

      Thanks

    • Rabindra Paul
      Ansys Employee

      Hi Noelly:

       

      Thanks for using learning forum. For details on your queries, it would be better to work with support team by submitting a support case. However, if you want to use fixed flow for a fan then you could choose either 'fixed volumetric or fixed massflow rate' option.

      If you use 'curve' option then you need to supply fan curve and depending on the model ( flow resistence and other boundary set up) software will solve CFD equations and an appropriate fan operating point will be determined. A converged solution should always work with a operating point that will lie on the supplied fan curve.

       

      You can monitor pressure at two points to get the pressure drop between two points. Hope this give you some idea. You may also review documents for the details.

       

      Regards,

       

      Rabindra

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