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Old   October 10, 2012, 20:17
Default Wall condensation CFX
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Hi,

I would like to model the effect of wall condensation within a vessel to assess the pressure change occurring. The fluid dynamics update for ANSYS v14 says that CFX is able to do this, and was presented as new feature. I was going to write some user Fortran and make the walls a mass and energy sink, is there a more elegant way of accomplishing this?
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Old   October 10, 2012, 20:22
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I should mention I am trying to avoid modeling the actual mult-iphase flow within the vessel due to serious simulation time constraints. Thanks for everyone's input!
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Old   October 11, 2012, 06:03
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You can define mass and energy sinks with expressions and CCL. No need for fortran.

If you have serious time constraints then I would contact CFX support to get an example simulation using this model.
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Old   October 11, 2012, 07:21
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Version 14 has introduced wall condensation model. For setup you can use library template wall_condensation.ccl situated in ANSYS Inc/v140/CFX/etc/model-templates
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Old   October 11, 2012, 07:37
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Thanks a lot for the advice! I will use the template as suggested. I didn't see any explicit mention of it in the manuals, so I was wondering if it was a marketing gimmick.

Cheers
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Old   October 11, 2012, 18:25
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Quote:
so I was wondering if it was a marketing gimmick
ha ha ha - you mean a complete lie?

There is a lot of functionality in CFX which is not documented. You have to contact CFX support to find out how to get it working. This is not a silly as it sounds - these models are complex with many settings and require careful setup to work properly. Getting support from the people who wrote the software to get these models working is wise.
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Old   October 12, 2012, 11:17
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Hi Glenn,

I contacted support and they are looking over my settings....the model ran, but the results were not as expected. Like you said, very complicated model, I will let the experts make sure everything is correct.

Cheers
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