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Calculation of Wall Shear Stress

Posted February 1, 2014 at 22:53 by Nucleophobe
Updated February 2, 2014 at 02:10 by Nucleophobe

Originally Posted by Dave442 View Post
Hi Glen,

Sorry, I wasn't asking you to check my calculations or anything. I was just wondering, as I cant find the definition in the theory manual, if the wall shear stress vector is definitely derived in CFX from the dot product of the viscous stress tensor and the unit normal vector as follows:

Tau = T . n

T = viscous stress tensor
n = surface normal vector
Tau = wall shear stress vector

As far as my axes are concerned, I generated
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Reg. LES in OpenFOAM

Posted January 17, 2014 at 09:51 by pierellozzo
Tags k_boundary

Nice post on k at the boundary

Originally Posted by alberto View Post
Some picky comment, but I hope of some help.

  1. Depending on the information you have from experiments, you can, at least roughly, estimate the residual kinetic energy at the inlet, and use that value. If you have PIV measurements of the inlet, you can filter that velocity filter that velocity field with the same filter size you use in the simulation, and obtain the value of the residual k at the BC.
  2. Giving as boundary condition the
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Computational Core of HyperFLOW2D now open source, meet OpenHyperFLOW2D !

Posted December 24, 2013 at 13:51 by SergeAS
Updated June 8, 2016 at 17:10 by SergeAS

Computational Core of my oldest 2D NS-solver now open source (LGPLv3),
meet OpenHyperFLOW2D
(include serial and parallel MPI,OpenMP and CUDA versions)

Attached Images
File Type: jpg ShockBubble2D-T.jpg (25.4 KB, 137 views)
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Convergence in ANSYS Fluent

Posted December 13, 2013 at 06:00 by Centurion2011

At convergence, the following should be satisfied:
  • All discrete conservation equations (momentum, energy, etc.) are obeyed in all cells to a specified tolerance OR the solution no longer changes with subsequent iterations.
  • Overall mass, momentum, energy, and scalar balances are achieved.
  • Monitoring convergence using residual history:
  • Generally, a decrease in residuals by three orders of magnitude indicates at least qualitative convergence. At this point, the major flow features should be
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God bless America

Posted November 29, 2013 at 07:52 by skeptik (CFD notes)

Good source of DAKOTA tutorials.
Look here.

For older versions of DAKOTA adopting cases is little bit tricky pursuit, but it's really work.
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