# RMS velocity

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 February 26, 2006, 04:40 RMS velocity #1 user Guest   Posts: n/a hello everybody Is it possible to get the value Root mean Square(RMS ) velocity of fluid in CFX post please help me with regards user

 February 26, 2006, 04:54 Re: RMS velocity #2 TB Guest   Posts: n/a Are you talking about steady- or transient-flow? Try giving a bit more details here...

 February 26, 2006, 09:26 Re: RMS velocity #3 user Guest   Posts: n/a hello thanks for replying i am talking abt transient flow i want to get the value of the normal and shear stress, for that i am trying to get root mean squre velocity with regards user

 February 27, 2006, 13:37 Re: RMS velocity #4 Robin Guest   Posts: n/a Just enter an expression for the root mean square. For any variable, say Phi RMS Phi = sqrt(sum(Phi^2)) Simple.

 February 27, 2006, 20:52 Re: RMS velocity #5 Eike Guest   Posts: n/a Hi An other way to get the RMS is to include a transient statistic. You can do this on the output control panel. regards eike

 February 27, 2006, 23:15 Re: RMS velocity #6 Robin Guest   Posts: n/a Sorry, missed the fact that this was transient. Disregard my suggestion. Eike has the right idea. -Robin

 February 27, 2006, 23:54 Re: RMS velocity #7 TB Guest   Posts: n/a Eike is right. If you have already run the solver, consider output the variable vs time and calculate rms value manually in Excel or Matlab or any other software that may suit you. You can also write a small program using command window if you know how.

 February 28, 2006, 04:19 Re: RMS velocity #8 user Guest   Posts: n/a hello Robin,Elike and TB thanks for taking more effort let me know how do i include RMS in output control panel i thing i have to include the Root mean square option in trantient statics is it correct or not please help me user

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