Friction Drag and Pressure Drag

David Galvis_21599
David Galvis_21599 Altair Community Member
edited December 2023 in Community Q&A

Hi!

I would like to ask if it is possible to obtain the friction drag and the pressure drag on Acusolve. I know that I can get the total drag by vector component and also the aerodynamic momentum, but I can't find a way to obtain the percentage of drag that comes from friction.

Thank you!

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Best Answer

  • acupro
    acupro
    Altair Employee
    edited December 2023 Answer ✓

    You should be able to get wall shear stress (on turbulence walls) and surface area - this would be the nodal values - then you multiply those to get the nodal shear force, which I think should be the nodal friction force.  Sum those up and you have the surface friction force.

    If you issue:

    acuTrans  -out  -to  info  -extout

    you can see the entire list of nodal quantities in the current results.  Wall shear stress is in the standard nodal output, but you'll need to request surface nodal output on the desired surfaces - for nodal area.  (Maybe there for walls left as type = auto_wall)

Answers

  • acupro
    acupro
    Altair Employee
    edited December 2023 Answer ✓

    You should be able to get wall shear stress (on turbulence walls) and surface area - this would be the nodal values - then you multiply those to get the nodal shear force, which I think should be the nodal friction force.  Sum those up and you have the surface friction force.

    If you issue:

    acuTrans  -out  -to  info  -extout

    you can see the entire list of nodal quantities in the current results.  Wall shear stress is in the standard nodal output, but you'll need to request surface nodal output on the desired surfaces - for nodal area.  (Maybe there for walls left as type = auto_wall)

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