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Industrial_CFD October 10, 2012 20:17

Wall condensation CFX

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?

Industrial_CFD October 10, 2012 20:22

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!

ghorrocks October 11, 2012 06:03

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.

Sixkillers October 11, 2012 07:21

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

Industrial_CFD October 11, 2012 07:37

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.


ghorrocks October 11, 2012 18:25


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.

Industrial_CFD October 12, 2012 11:17

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.


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