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RAMAN6089 January 3, 2010 05:20

effect of the below said error
| ****** Notice ****** |
| Wall Heat Transfer Coefficient written to the results file uses |
| "Wall Adjacent Temperature" for the bulk temperature. If you want |
| to override the bulk temperature then set the expert parameter |
| "tbulk for htc = <value>" |

Tristan January 4, 2010 19:33

The heat transfer coefficient (h) is defined in terms of a freestream or "bulk" temperature: h=qwall/(A*(Twall-Tbulk)) where qwall is the heat transfer rate to/from the wall in watts, A is the wall area, Twall is the wall temperature, and Tbulk is the "bulk" temperature. It looks like CFX defaults to using the near wall temperature as the "bulk" temperature. If you want it calculated based on a different reference temperature then you need to set the expert parameter.

It's not an error, it's just a warning so you don't go and apply the heat transfer coefficient CFX calculates in the wrong way.


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