Center of Pressure Calculation in AcuFieldView

thavemann11_21105
thavemann11_21105 Altair Community Member
edited October 2020 in Community Q&A

Hello everyone,

 

Is there a way to calculate the center of pressure in AcuFieldView for an aerodynamic analysis that was performed in Virtual Wind Tunnel?

 

Thanks for your help,

Tommy

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Answers

  • acupro
    acupro
    Altair Employee
    edited June 2020

    What is the definition of center of pressure you wish to use?  The answer will be different if you use only the pressure forces - versus if you use both pressure and viscous forces.

     

    So, let's assume that it is acceptable to include the viscous effects in the definition of CoP.  In that case, you can compute the values based on the surface output for traction force and moment that AcuSolve/AcuProbe provides:

    CoP_x = z_moment/y_traction
    CoP_y = z_moment/x_traction

  • thavemann11_21105
    thavemann11_21105 Altair Community Member
    edited June 2020

    Thank you so much for your help!

  • thavemann11_21105
    thavemann11_21105 Altair Community Member
    edited June 2020

    acupro,

     

    I created the CoP_x function in AcuFieldView and created a boundary surface contour plot with respect to the vector function of velocity. When doing this, the legend shows that the values range from positive to negative values in the order of 100 millions, rather than just one single value for center of pressure in the x-direction. Should I be plotting with respect to a different function than velocity?

     

    Thanks,

    Tommy

  • acupro
    acupro
    Altair Employee
    edited June 2020

    I believe that previous information was to be used based on the surface integrated data - which you could plot/extract in AcuProbe or AcuOut.  So CoP_x would be the Surface-Integrated z_moment divided by the Surface-Integrated y_traction and CoP_y would be the Surface Integrated z_moment divided by the Surface Integrated x_traction.

     

    Does that give you more reasonable results?

  • thavemann11_21105
    thavemann11_21105 Altair Community Member
    edited June 2020

    The results are definitely better than before, but still not reasonable. Could there be an issue of where the global coordinate system is placed? Should the global coordinate system be at the very front tip of the body?

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