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July 3, 2014, 04:40 |
externalwallHeatflux
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#1 |
New Member
ashwin
Join Date: Jul 2012
Location: erlangen
Posts: 26
Rep Power: 13 |
Hey Guys,
I am using the externalWallHeatFlux boundary condition on one of my walls in a room and here is how I give the condition. Code:
wall { type externalWallHeatFluxTemperature; kappa fluidThermo; // fluidThermo, solidThermo or // lookup //q uniform 1000; // heat flux / [W/m2] Ta uniform 273.15; // ambient temperature /[K] h uniform 25.0; // heat transfer coeff /[W/K/m2] thicknessLayers (0.1); // thickness of layer [m] kappaLayers (0.05); // thermal conductivity of // layer [W/m/K] value uniform 294.15; // initial temperature / [K] kappaName none; Does anybody know where am I going wrong? I am using buoyantSimpleFoam solver for my case. Here is the attached picture of the wall. Hope someone here has got an idea Best Ashwin |
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October 31, 2014, 06:57 |
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#2 |
Senior Member
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 732
Rep Power: 22 |
Can you post your temperature file here?
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October 31, 2014, 07:54 |
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#3 |
New Member
ashwin
Join Date: Jul 2012
Location: erlangen
Posts: 26
Rep Power: 13 |
Code:
dimensions [0 0 0 1 0 0 0]; internalField uniform 294.15; boundaryField { inlet { type fixedValue; value uniform 285; } outlet { type zeroGradient; } box { type zeroGradient; } wall { type externalWallHeatFluxTemperature; kappa fluidThermo; // fluidThermo, solidThermo or // lookup //q uniform 1000; // heat flux / [W/m2] Ta uniform 273.15; // ambient temperature /[K] h uniform 25.0; // heat transfer coeff /[W/K/m2] thicknessLayers (0.1); // thickness of layer [m] kappaLayers (0.05); // thermal conductivity of // layer [W/m/K] value uniform 294.15; // initial temperature / [K] kappaName none; } } |
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October 31, 2014, 08:49 |
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#4 |
Senior Member
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 732
Rep Power: 22 |
Your inlet temperature is 293.15 K (20 C) and ambient temperature is 273.15 K (0 C). Also you have given value uniform 294.15; I think you meant to use 294.15 K and used 273.15 K instead.
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October 31, 2014, 08:55 |
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#5 |
New Member
ashwin
Join Date: Jul 2012
Location: erlangen
Posts: 26
Rep Power: 13 |
Hi vasava,
Sorry I replaced it with the correct file now. Since it's been a long time I got confused with the files. Best Ashwin |
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March 24, 2015, 01:24 |
Is Ta must be less than bulk fluid temperature?
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#6 |
New Member
nitin
Join Date: Oct 2014
Posts: 1
Rep Power: 0 |
Is Ta must be less than bulk fluid temperature?
I have tried externalWallHeatFluxTemperature boundary condition in simple pipe flow. Simulation run perfectly when ambient temperature is less than bulk fluid temperature. When ambient temperature greater than bulk fluid temperature simulation get diverged. Please help me . Regards Nitin Chauhan |
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