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-   -   user fortran gradv and xy nodal shear stress (http://www.cfd-online.com/Forums/main/4161-user-fortran-gradv-xy-nodal-shear-stress.html)

Tiger November 29, 2001 09:00

user fortran gradv and xy nodal shear stress
 
Hi, All,

anyone can tell me what is the physical expression of xy nodal shear stress, something like tauxy=-viscosity*(du/dy+dv/dx)?

Is there anyone who tried to use user fortran gradv of cfx software. I have got some strange results from this subroutine, especially using cylindrical coordinate. The following is one part of usrtrn: .... ipa=1 call setwrk('usrtrn', 'work ','ugrad ',3*ncell, jugrad) call setwrk('usrtrn', 'work ','vgrad ',3*ncell, jvgrad) call setwrk('usrtrn', 'work ','wgrad ',3*ncell, jwgrad) do 400 i=1, ilen do 400 j=1, jlen do 400 k=k,klen

inode=ip(i,j,k)

call gradv('usrtrn',ipa, u(inode,ipa), v(inode,ipa),w(inode,ipa), work(ugrad),work(vgrad),work(wgrad)......) .... call delwrk('usrtrn', ...)


Jim Park November 29, 2001 10:04

Re: user fortran gradv and xy nodal shear stress
 
There's another discussion group on cfd-online that is especially for cfx users. They'll likely have an answer for you.


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