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how do i calculate shear rate

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Old   September 17, 2002, 06:00
Default how do i calculate shear rate
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joel
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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
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Old   September 17, 2002, 10:31
Default Re: how do i calculate shear rate
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guang ai
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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.
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Old   September 17, 2002, 10:37
Default Re: how do i calculate shear rate
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joel
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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 =......
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Old   September 17, 2002, 15:38
Default Re: how do i calculate shear rate
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guang ai
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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.
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Old   September 18, 2002, 05:31
Default Re: how do i calculate shear rate
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joel
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yeah im using laminar non-newtonian flow, hence the need for gamma dot
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