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groovybc and heat flux on wall

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Old   October 5, 2013, 08:39
Default groovybc and heat flux on wall
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mohsen kh
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Hi foamers
I used groovyBC as boundary condition for wall of my case.but I have a problem.I modifed the heat flux on the wall but when temperature of the upper region of furnace is still 298K and the outer temperature is 298K too.so I expected to see zero gradient on the wall but there is a flux in paraFoam
it show me temprature at walls 0 while the lowest temperature is 298 in my boundary conditions.
I attached my case figure.
any help would be appreciated.

type groovyBc;
variables "h=1.12;k=0.065;Tinf=298;";
gradientExpression "h/k*(T-Tinf)";
fractionExprssion "0"; // 0 for neumann boundary condition
value uniform 298;

regards
Mohsen
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Last edited by m5m5kh; October 5, 2013 at 10:05.
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Old   October 6, 2013, 00:46
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mohsen kh
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no idea!!!!!!!!!!
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Old   October 6, 2013, 10:16
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Bernhard Gschaider
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Quote:
Originally Posted by m5m5kh View Post
Hi foamers
I used groovyBC as boundary condition for wall of my case.but I have a problem.I modifed the heat flux on the wall but when temperature of the upper region of furnace is still 298K and the outer temperature is 298K too.so I expected to see zero gradient on the wall but there is a flux in paraFoam
it show me temprature at walls 0 while the lowest temperature is 298 in my boundary conditions.
I attached my case figure.
any help would be appreciated.

type groovyBc;
variables "h=1.12;k=0.065;Tinf=298;";
gradientExpression "h/k*(T-Tinf)";
fractionExprssion "0"; // 0 for neumann boundary condition
value uniform 298;

regards
Mohsen
a) you have a typo in fractionExpression
b) Paraview doesn't know anything about groovyBC so the values it displays on the boundary might be wrong
c) for finding problems always use the Cell-values in Paraview. The point values are something it interpolates from the real values and might as well be a problem of Paraview
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Old   October 6, 2013, 10:19
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Originally Posted by m5m5kh View Post
no idea!!!!!!!!!!
I think it is a bit strange to expect an immediate answer

a) because this is a voluntary community service
b) it is a weekend
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Old   October 6, 2013, 11:30
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mohsen kh
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Hi Bernhard
I'm sorry for ruining your weekend you are right
apologies

regards
Mohsen
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