control variable bound in cfx

klarke · April 13, 2009, 05:46

HI,everyone
I am doing a compressor transient research,it have run a lot of time step,but suddenly,it stopped like below

Error in subroutine GET_SPECVAR :
Specified values for Total Temperature are out of bounds on Outlet GETVAR originally called by subroutine CAL_ENTHTOT). So did you have any experience of this error or how to control the varible bound.Thanks a lot!

joey2007 · April 16, 2009, 16:01

Take a intermediate result or backup and check the total temperature. Suppose the result is unphysical.

Daniel Frederik · June 23, 2014, 07:00

If the result is unphisical is there still a way to make it work or does that mean, that it is phisically impossible to simulate that case?

ghorrocks · June 23, 2014, 19:29

This could be caused by a numerical wander which will pass and it will eventually converge to the correct value, or it could be that the simulation was not physically possible in the first place.

I would save a results file just before the crash and see what it look like.

Daniel Frederik · June 24, 2014, 06:29

Thank you Glenn,
I solved the problem now by using a initial File of a previous run with other boundary condition values. For some reason the Total Temperature went out of bounds without an adequate initial guess.

ghorrocks · June 24, 2014, 19:15

This is quite common. That is why a good initial condition helps a lot.

April 13, 2009, 05:46	control variable bound in cfx	#1
klarke New Member Join Date: Mar 2009 Posts: 2 Rep Power: 0	HI,everyone I am doing a compressor transient research,it have run a lot of time step,but suddenly,it stopped like below Error in subroutine GET_SPECVAR : Specified values for Total Temperature are out of bounds on Outlet GETVAR originally called by subroutine CAL_ENTHTOT). So did you have any experience of this error or how to control the varible bound.Thanks a lot!

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April 16, 2009, 16:01		#2
joey2007 Senior Member Join Date: Mar 2009 Location: Europe Posts: 169 Rep Power: 17	Take a intermediate result or backup and check the total temperature. Suppose the result is unphysical.

June 23, 2014, 07:00		#3
Daniel Frederik Member Daniel Frederik Join Date: Apr 2014 Location: Switzerland Posts: 38 Rep Power: 12	If the result is unphisical is there still a way to make it work or does that mean, that it is phisically impossible to simulate that case?

June 23, 2014, 19:29		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	This could be caused by a numerical wander which will pass and it will eventually converge to the correct value, or it could be that the simulation was not physically possible in the first place. I would save a results file just before the crash and see what it look like.

June 24, 2014, 06:29		#5
Daniel Frederik Member Daniel Frederik Join Date: Apr 2014 Location: Switzerland Posts: 38 Rep Power: 12	Thank you Glenn, I solved the problem now by using a initial File of a previous run with other boundary condition values. For some reason the Total Temperature went out of bounds without an adequate initial guess.

June 24, 2014, 19:15		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	This is quite common. That is why a good initial condition helps a lot.