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Old   May 19, 2003, 03:33
Default thermal conductivity
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Magnus Rohde
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During the simulation of heat transfer during laser-solid interactions I came to the result that for a given value of the thermal conductivity ( set by PRNDTL(TEM1)=-5.0 in Q1) the calculated temperature distribution did not correspond to this value but to a thermal conductivity which is orders of magnitude higher. I have checked that against results obtained with an other FE-package and also against experimental results. Are there any factors that I have missed?
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Old   May 19, 2003, 05:17
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John Ludwig, CHAM
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Please contact CHAM User Support at support@cham.co.uk, giving details of the PHOENICS version and attaching the Q1 and any geometry or ground files needed.
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Old   May 22, 2003, 07:36
Default Re: thermal conductivity
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cham support
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Your analysis is correct. The problem is that V3.4 erroneously uses (density*thermal conductivity) for the thermal conductivity in the TEM1 equation, if storage is NOT provided for the property material index, i.e. the PHOENICS whole-field variable PRPS has not been STOREd. This problem is not present in the later release, i.e. PHOENICS V3.5. The problem can be cured by activating storage of PRPS from the VR Environment under:

'Menu'>'Models'>'Solution control/Extra Variables'.

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