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[swak4Foam] evaporation / vapor flux / groovyBC |
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December 4, 2011, 22:17 |
evaporation / vapor flux / groovyBC
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#1 |
New Member
shinya ogata
Join Date: Sep 2010
Posts: 8
Rep Power: 15 |
Hi!
I want to calculate water evaporation with simpleFoam. I have already added moisture field as X in simpleFoam solver. And then, I am trying to make evaporation boundary using groovyBC. I wrote a boundary condition of vapor flux referring to heat flux. z_ { type groovyBC; value uniform 0; gradientExpression "gradX"; fractionExpression "0"; variables "alphac=5.8+3.9*mag(internalField(U));Xs=0.0167;al fadash=3.6*alphac/3600;capadash=1;rhodash=1.2;gradX=alfadash*(Xs-internalField(X))/(kappaEffX*capadash*rhodash);"; } SimpleFoam has done without any error. But amount of water evaporation is too little comparing to a experiment data. Is the boundary condition which I wrote right ? Shinya |
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December 5, 2011, 04:57 |
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#2 | |
Assistant Moderator
Bernhard Gschaider
Join Date: Mar 2009
Posts: 4,225
Rep Power: 51 |
Quote:
a) never trust experimental data b) if you use internalField like that I'd expect some kind of grid dependence. Try changing the resolution and see if that makes a difference |
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December 11, 2011, 00:53 |
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#3 |
New Member
shinya ogata
Join Date: Sep 2010
Posts: 8
Rep Power: 15 |
Hi gschaider !
Thank you for your advise! I subdivided mesh and the amount of evaporation changed. As you pointed, it could be mesh dependence. I will try to find appropriate mesh. Thank you again. Shinya |
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December 11, 2011, 06:14 |
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#4 | |
Assistant Moderator
Bernhard Gschaider
Join Date: Mar 2009
Posts: 4,225
Rep Power: 51 |
Quote:
http://openfoamwiki.net/index.php/Co...g_to_need_are: Good luck |
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December 13, 2011, 03:43 |
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#5 |
New Member
shinya ogata
Join Date: Sep 2010
Posts: 8
Rep Power: 15 |
Hi gschaider !
Your advise is right. Even if I found appropriate mesh comparing with experiment, I cannot use it with another model. I will try to make mesh-independent formulation. Thank you again. Shinya |
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Tags |
evaporation groovybc |
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