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CFX 11 Solver problem

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Old   December 10, 2008, 10:32
Default CFX 11 Solver problem
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| ****** Notice ****** | | A wall has been placed at portion(s) of an OUTLET | | boundary condition (at 98.5% of the faces, 93.8% of the area) | | to prevent fluid from flowing into the domain. | | The boundary condition name is: outlet. | | The fluid name is: Air at 25 C. | | If this situation persists, consider switching | | to an Opening type boundary condition instead. | +--------------------------------------------------------------------+

+--------------------------------------------------------------------+ | ERROR #004100018 has occurred in subroutine FINMES. | | Message: | | Fatal overflow in linear solver.

Can't solve this problem. Tried everything but nothing helps. What can be wrong?
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Old   December 10, 2008, 11:01
Default Re: CFX 11 Solver problem
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Without any details of your simulation this can be caused by a number of things. The message simply means there is nearly no outflow over your outlet, so your setup is incorrect. This could be caused by physics (eg. imposed outlet static pressure too high), an improper choice of the location of the outlet (eg. vortices convecting over the boundary --> extend your domain), or simply instabilities associated with startup (try a smaller timestep/local timestepping etc.).
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Old   December 11, 2008, 11:36
Default Re: CFX 11 Solver problem
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What timon says is correct, but first of all I would try to extend the outlet (3-4 times the diameter and run it again. You can verify in the post-processor if you have vortex at the outlet.
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Old   December 11, 2008, 19:20
Default Re: CFX 11 Solver problem
Glenn Horrocks
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It is a warning, not an error. All it is saying is that there is some reverse flow at an outlet and it has been stopped as reverse flow is not allowed at outlets. If the effect of this reverse flow is not significant then you can ignore the error and continue. If the reverse flow is significant you should (in increasing order of accuracy):

1) Replace it with an opening which allows reverse flow 2) Extend your domain so the new outlet location has flow in one direction only

And you should check your domain physics to check that is OK.

Glenn Horrocks
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