# how do i calculate shear rate

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 September 17, 2002, 06:00 how do i calculate shear rate #1 joel Guest   Posts: n/a Sponsored Links I know this is kinda a star-cd specific question but how would i calculate shear rate (gamma dot) from variables output from a simulation. I dont mean the specifics within the program more a general formula

 September 17, 2002, 10:31 Re: how do i calculate shear rate #2 guang ai Guest   Posts: n/a in star-cd you can use 'operate'command or 'posdat' subroutine. if you want manipulate computational result outside you need write your own program to deal with the output from star-cd. i guess there must be countparts in other cfd package. i am not sure that will help.

 September 17, 2002, 10:37 Re: how do i calculate shear rate #3 joel Guest   Posts: n/a cheers, i know about the operate i was going to use that to get around having to use a sub-routine, my question is what do i have to operate to get shear rate, i.e. shear rate =......

 September 17, 2002, 15:38 Re: how do i calculate shear rate #4 guang ai Guest   Posts: n/a as i know for turbulent flow only the layer next to wall shear rate concept makes sense as long as we chose wall function. shear rate = vmag(p) / distance from wal. for laminar flow, general form shear rate should be part of strain tensor that can throughout domain.

 September 18, 2002, 05:31 Re: how do i calculate shear rate #5 joel Guest   Posts: n/a yeah im using laminar non-newtonian flow, hence the need for gamma dot

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