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Old   January 4, 2017, 11:43
Default isolated region problem
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venkatesh
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+--------------------------------------------------------------------+
| Checking for Isolated Fluid Regions |
+--------------------------------------------------------------------+

3 isolated fluid regions were found in domain Default Domain


If the isolated regions do not have the pressure level set either
by the boundary conditions or using a reference pressure equation,
you may encounter severe robustness problems.

This situation may have arisen because a domain interface was not
properly defined during problem setup. Please carefully check
the setup.

The solver will stop now and write a results file. The isolated
regions can be visualised in CFX Post by making plots of the
variable "Isolated Volumes".

If you are sure that the pressure level is set in each isolated
fluid region then you can force the solver to turn off this check
by setting the expert parameter "check isolated regions = f".

what are the possibilities of this error
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Old   January 4, 2017, 18:05
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Glenn Horrocks
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The implications are exactly what it says - you may have convergence difficulties. But this situation is common in things like heat exchanger models and often the simulation runs OK desipte the warning. So it is just a notice to the user to be aware of the issue.
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Old   January 4, 2017, 19:54
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But the solver does not starts to solve after this error...It exits with error code 1

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Old   January 4, 2017, 22:11
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ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Sorry, yes, it is an error which stops the solver.

Your choices are:

Fix the problem and connect the isolated volumes

or

Use the work-around expert parameter - and make sure you know the implications of this.
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Old   January 4, 2017, 22:14
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Can u please tell me how to use expert parameters

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Old   January 5, 2017, 00:53
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Quote:
Originally Posted by vish161095 View Post
Can u please tell me how to use expert parameters

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CFX Pre: Right Click 'Solver'> Insert Expert Parameters> Convergence Control> Convergence and Runtime Control> Check Isolated Regions=f
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Old   January 5, 2017, 10:29
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Thank u soo much

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