# calculating shear rate

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 August 21, 2012, 13:49 calculating shear rate #1 Senior Member   hamid Join Date: Nov 2010 Posts: 185 Rep Power: 8 Sponsored Links Hi Haw can i calculate shear rate in cfd-post, or in fluent,? and what is the meaning of velocity u.gradient y ? thanks so much

 August 22, 2012, 05:08 #2 Senior Member   Join Date: Aug 2011 Posts: 315 Rep Power: 14 you can find it in fluent via contours ... -> derivatives ... -> strain rate velocity dot gradient y = velocity component in y-direction

 August 22, 2012, 05:31 #3 Senior Member   hamid Join Date: Nov 2010 Posts: 185 Rep Power: 8 thank you so much, yes it works, .. however I am wondering if still I can use "velocity u.gradient y" as "dUx/dy" in CFD-Post, if so, would you please let me know why the unit does not pop up in drop down menu in cfd-post for "velocity u.gradient y" Thank you again

 August 22, 2012, 21:56 #4 Senior Member   Join Date: Aug 2011 Posts: 315 Rep Power: 14 Sorry, I thought you were asking an mathematical expression $u\cdot\nabla y$ which results in the y-component of velocity. In CFD-Post, "velocity u.gradient y" is a CEL expression and represents "dUx/dy", as you have mentioned. You should click the ellipsis (..., indicating more variables) beside the drop-down list to get this variable.

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