Aerodynamics: wall shear stress

alpharays786
alpharays786 Altair Community Member
edited October 2020 in Community Q&A

Hi all,

 

How to measure or plot boundary surface of x-wall shear stress in AcuFieldView?

 

The equation is, T= U (delta u/ delta y)

 

T= wall shear stress

U= dynamic viscosity

u= velocity

y= distance

 

Any idea how to compute (delta u/ delta y)?

 

Thanks

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited July 2015

    Hi,

    In Acufieldview, Boundary surface.(Attached thumbnail for reference)

     

    If you want to visualize the shear stresses, it can be approximated using AcuFieldView with the attached formula restart file.  This approach uses Newton's law of viscosity to compute the shear, and works for all Newtonian fluids (turbulent or laminar).  The downfall of this approach is that it is an approximation, and it relies on estimation of the surface normal vector.  In the attached file, the normal vector is computed based on eddy viscosity. In all cases, you'll need to modify the formula restart file to contain the proper value of molecular viscosity for your simulation.

    Regards

    Rahul R

    Unable to find an attachment - read this blog

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