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Heat Transfer between two different phase fluids

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Old   March 20, 2011, 10:55
Default Heat Transfer between two different phase fluids
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jjj
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Julian Nash
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hi i was wondering if anyone could help me.
i'm busy with an analysis for gas cooling uptakes of a furnace. Im struggling to get the analysis to run, ive created 3 domainds one for the water & another for the steel & another for the gas. ive also inserted all my interfaces between the surfaces. but it does not want to solve, it gives me the error "ERROR #001100279 has occured in subrutine ErrAction
MESSAGE :
>Floating point exeption : Overflow.

can someone please advise me on wat to check/change.
If anymore information is required just let me know i'll be more then willing to put up some screen shots or watever is needed...

regards
julian
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Old   March 20, 2011, 23:03
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Your simulation has diverged. You need to improve the numerical stability. Try to fix any boundary or physics problems, smaller time steps, tighter convergence, better mesh quality.
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Old   March 21, 2011, 06:19
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hi i did end up changing the mesh to a higher quality. But now it gives me the error:

| ERROR #002100012 has occurred in subroutine cVolSec. |
| Message: |
| A negative ELEMENT volume has been detected. This is a fatal |
| error and execution will be terminated. The location of the first |
| negative volume is reported below. |
| Volume : -0.1104E-10 |
| Location : ( -0.48073E+00, -0.44146E+00, 0.57380E+00)

please advise?

thanks
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Old   March 21, 2011, 15:56
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CFX assembles control volumes from your mesh. Some of these volumes are negative. The mesh quality is still too bad.

In order to find the region load the def-file into post, generate a point and copy the given location to the coordinates. It will show you where the negative volume is. Go back to meshing and improve it there.
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