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', ...)

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.