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Wall to Bed Heat Transfer Coefficient

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Old   November 7, 2012, 23:01
Default Wall to Bed Heat Transfer Coefficient
Musango Lungu
Join Date: Dec 2011
Location: China
Posts: 73
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I am trying to monitor the transient wall to bed heat transfer coefficient in a fluidized bed using a formula defined in the custom field calculator as
h= (gas volume fraction*gas thermal conductivity* gas temp gradient+ solid volume fraction*solid thermal conductivity* solid temp gradient)/( Wall temp-Bed temp)
However my problem is accessing the temperature gradients in the custom field calculator. I have tried using the /solve/set/expert function and answering yes to the keep temporary solver memory from being freed as suggested in some of the posts on the forum. However I get the following error

FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor.
Error Object: #f
when I try to access the temperature gradients. How do I overcome this problem?
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