<div dir="ltr">The following should work:<br><ul><li>Gradient of Unstructured Data Set</li><li>Extract Surface<br></li><li>Generate Surface Normals</li><li>Calculator filter to compute the wall shear stress from the gradient and the surface normals.<br></li></ul></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Oct 21, 2016 at 11:55 PM, Fande Kong <span dir="ltr"><<a href="mailto:fdkong.jd@gmail.com" target="_blank">fdkong.jd@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Still have hard time on this. If anyone in this mail list knows how to do this, I will appreciate for any suggestions. It would be great, if these is a step-by-step example.<div><br></div><div>Regards,</div><div><br></div><div>Fande,</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Sep 18, 2016 at 6:54 PM, Fande Kong <span dir="ltr"><<a href="mailto:fdkong.jd@gmail.com" target="_blank">fdkong.jd@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi David,<div><br></div><div>Thanks very much for your reply. I am a new paraview user. Could you possibly show me more details? Some documentations on each of these steps?<br><div class="gmail_extra"><br><div class="gmail_quote"><span>On Sun, Sep 18, 2016 at 5:39 PM, David Thompson <span dir="ltr"><<a href="mailto:david.thompson@kitware.com" target="_blank">david.thompson@kitware.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div></div><div style="direction:inherit">Hi Fande,</div><div style="direction:inherit"><br></div><div style="direction:inherit">You should be able to use the gradient filter to compute the velocity gradient and examine the component of the gradient normal to the wall. That will be proportional to the shear stress at the wall. Is the wall aligned with a coordinate axis?</div></div></blockquote><div><br></div></span><div>No, the wall is not aligned with a coordinate axis. In fact, the geometry is very complex. It is a pulmonary artery tree with several generations.</div><div><br></div><div>Thanks,</div><div><br></div><div>Fande,</div><span><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div style="direction:inherit"> If not, you will need to extract the wall surface and generate normal vectors, then dot the gradient with the normal vectors.</div><div style="direction:inherit"><br></div><div style="direction:inherit"> David</div><div><div class="m_-9139643114222023071m_2696303905118768001h5"><div><br>On Sep 18, 2016, at 16:01, Fande Kong <<a href="mailto:fdkong.jd@gmail.com" target="_blank">fdkong.jd@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Hi Developers,<div><br></div><div>I am solving an incompressible Navier-Stokes equations, and I have solutions for the velocity (u) and the pressure (p). Is it possible to show the wall shear stress in paraview using the velocity? </div><div><br></div><div><br></div><div>Fande Kong,</div></div>
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