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August 18, 2012, 12:39
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different answers from different UNDER RELAXATION FACTOR
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#1 |
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Member
misagh
Join Date: Apr 2012
Location: iran
Posts: 38
Rep Power: 3  |
Hi,
i have a 2-D micro-channel that a constant heat flux is applied on its walls. when i change under relaxation factor or discretization of momentum and energy the result(e.g conv. heat transfer coeff.[h]) changes extensively(although the equations have been solved and converged) what can i do?which under relaxation factor is suitable? best regards. |
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August 18, 2012, 20:59
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#2 |
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Member
Touré
Join Date: Aug 2010
Location: Montréal
Posts: 84
Rep Power: 4 |
Do you have enough elements?
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August 19, 2012, 06:10
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#3 |
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Member
misagh
Join Date: Apr 2012
Location: iran
Posts: 38
Rep Power: 3 |
yes, 100'000 elements.im sure the number of elements are enough.
when i change URF in other geometries like macro scale the difference between results is less than 2 %.but in this case(microtube) changes are sever(more than40-50 %). any guidance is appreciated. |
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August 19, 2012, 08:34
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#4 |
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Member
Touré
Join Date: Aug 2010
Location: Montréal
Posts: 84
Rep Power: 4 |
It could be due to the definition of your slip condition. See pages 17 and 18 of http://ethesis.nitrkl.ac.in/1934/1/avinash.pdf
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