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in user fortran, how to get velocity gradients

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Old   August 23, 2014, 05:22
Thumbs up in user fortran, how to get velocity gradients
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田道贵
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in CFX simulation, I use the fortran code to add a model, which needs liquid velocity gradient in radius.
in codes, I use "USER_GETVAR" to get the velocity gradient,
Call USER_GETVAR("water.Velocity w.Gradient",CRESLT,pGVel,CZ,DZ,IZ,LZ,RZ)
while it does not work and error presents in CFX solver
as follows:
Details of error:-
----------------
Error detected by routine MAKDIR
CDRNAM = VEL-3_FL2 /GRADIENT
CRESLT = ILEG

Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/VARIABLES

+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine MEMERR

Anybody encounter this issue?
Thank you for you kindness!
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Old   August 23, 2014, 18:48
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It seems the user_getvar utility has problems with gradient of vector components.

Try getting the gradient for velocity and work out the Velocity w.Gradient values out of it.

It will be good to check the documentation for how the array is organized for gradient of vectors. If recall correctly, it should be (3 Gradient components, NLOC, 3 variable components)
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Old   August 23, 2014, 20:41
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Though I addressed this problem by using the variable "water.Velocity.Gradient", I still thank you very much.
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