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how to set heat flux

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Old   July 28, 2014, 08:36
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hello , i am new at this. now i have a problem. how to set heat flux in patches ? i know these is fixedGradient in it .But in my problem. at time 0, gas is quiescence. but the next the time the gas will move because of the heat flux . i do not know how to transfer heat Flux to fixedGradient. at 0 it is Thermal .The next moment it is Thermal and Convection
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openfoam heat flux

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