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poor calculation with temparture-dependant specific heat

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Old   December 30, 2012, 04:29
Unhappy poor calculation with temparture-dependant specific heat
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I am trying to simulate the melting process with the method of effective heat capacity, which requires FLUENT to solve energy equations with changing specific heat. I wrote a udf to specify the specific heat. However, it doesn't help. Temperature rising rate is far beyond what it should be.
Then I tried to work with the constant specific heat, and the result was more acceptable, but not precise enough.
Could anyone tell me what should I be aware of to improve the iteration stability and precision with temperature-dependent property?
Thank you so much!
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Old   December 30, 2012, 06:59
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I guess it the problem of core flow physics available in Fluent rather than the specific heat.
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Old   January 2, 2013, 09:43
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Did you consider setting the enthalpy, too? This was a problem in my first simulations with temperature-dependent Cp.
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Old   January 3, 2013, 02:32
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Yes, You should also decrease energy URF.
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temperature dependence

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