dT/dt - FORTRAN
 

Hi

I am trying to write a FORTRAN routine which needs the local heating/cooling rate.

The utility USER_GETVAR can be used to get the local gradients (d/dx, d/dy, d/dz). Does anyone know how to get the local rate change?

Thanks Malcolm

Re: dT/dt - FORTRAN
 

Hi, This answer is based on CFX 4.4 (as this is what I use)...it may not helpful...sorry if this is the case!

In USRSRC (for example) to calculate dw/dt (a scalar variable), this can be done by getting the old scalar value in USRSRC:

CALL GETADD('USRSRC','VAROLD','SCAL ',ILEVEL,JSOLD)

Then dw/dt at a node would be given by something like:

(SCAL(INODE,1,1)-WORK(JSOLD+INODE-1))/DT

Note: DT can be obtained in USRSRC by including the named COMMON block /TRANSR/ TIME,DT,DTINVF,TPARM (similar to USRTRN)

Hope it helps.

RK