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April 13, 2009, 05:46 |
control variable bound in cfx
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#1 |
New Member
Join Date: Mar 2009
Posts: 2
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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 |
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#2 |
Senior Member
Join Date: Mar 2009
Location: Europe
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Take a intermediate result or backup and check the total temperature. Suppose the result is unphysical.
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June 23, 2014, 07:00 |
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#3 |
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Daniel Frederik
Join Date: Apr 2014
Location: Switzerland
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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?
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June 23, 2014, 19:29 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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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. |
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June 24, 2014, 06:29 |
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#5 |
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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. |
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June 24, 2014, 19:15 |
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#6 |
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.
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