Fan Component P-Q results not matching with input.

Jagan Adithya Elango
Jagan Adithya Elango Altair Community Member
edited January 2023 in Community Q&A

Hello experts, my pressure drop value (56.21Pa) isn't matching the appropriate ones in the input P-Q curve (64.16) despite the solution converging. I have attached documents for your reference. Need assistance in figuring this out. Thank you.

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Answers

  • acupro
    acupro
    Altair Employee
    edited January 2023

    I'm assuming your plot is showing pressure from "Fan Outlet" and "Fan Inlet" - the two 'ends' of the centrally-located fan volume.  Is that correct?  Is the thickness of that volume in the flow direction 0.032 as specified in the input file? The fan-component is assigned at the inlet surface to the fan.  Is that how it was defined?  (The input file has the direction indicated as -Z, so the main flow direction should be -Z.)  There would also be some level of dependency on the mesh resolution.

    Are you able to attach the model?

  • Jagan Adithya Elango
    Jagan Adithya Elango Altair Community Member
    edited January 2023

    Yes, they are the pressure from fan volume's inlet and outlet surfaces. The thickness of volume & direction is specified appropriately.

    image

    I have tried refining the mesh and boundary layer too, still there is a significant error in the pressure drop.
    Thank you.

  • acupro
    acupro
    Altair Employee
    edited January 2023

    Another question - does the geometry (size of the meshed model) accurately reflect the space occupied by the actual fan from which the P-Q curve was obtained?

    I ask that because I just went through the related tutorial ACU-T5101 and it behaves as expected.

  • Jagan Adithya Elango
    Jagan Adithya Elango Altair Community Member
    edited January 2023

    Another question - does the geometry (size of the meshed model) accurately reflect the space occupied by the actual fan from which the P-Q curve was obtained?

    I ask that because I just went through the related tutorial ACU-T5101 and it behaves as expected.

    Thank you