in user fortran, how to get velocity gradients

yuanyeguhong · August 23, 2014, 05:22

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!

Opaque · August 23, 2014, 18:48

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)

yuanyeguhong · August 23, 2014, 20:41

Though I addressed this problem by using the variable "water.Velocity.Gradient", I still thank you very much.

August 23, 2014, 05:22	in user fortran, how to get velocity gradients	#1
yuanyeguhong New Member 田道贵 Join Date: Jun 2014 Location: 哈尔滨 Posts: 2 Rep Power: 0	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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August 23, 2014, 18:48		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,815 Rep Power: 32	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)

August 23, 2014, 20:41		#3
yuanyeguhong New Member 田道贵 Join Date: Jun 2014 Location: 哈尔滨 Posts: 2 Rep Power: 0	Though I addressed this problem by using the variable "water.Velocity.Gradient", I still thank you very much.