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March 2, 2012, 07:15 |
Average Nusselt number
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#1 |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
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Dear Friends,
I have calculated local Nusselt number at the wall. How to calculate Average Nusselt number at the heated wall in OpenFOAM? (I am cosidering a square cavity) Can you help me? Thanks for your time. |
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April 6, 2012, 14:00 |
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#2 | |
New Member
giovanni silva
Join Date: Jul 2010
Posts: 14
Rep Power: 16 |
Quote:
Did you finally find a solution to your problem? Unfortunately, I`m not an expert in C++. So, It is too difficult for me. I would like to calculate the local and average Nusselt number in the same geometry as you[ I am working on a 2D laterally and volumetrically heated square cavity.] Could you help me? Thanks in advance! |
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April 6, 2012, 14:01 |
How did you calculate the local Nusselt number at the wall?
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#3 |
New Member
giovanni silva
Join Date: Jul 2010
Posts: 14
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How did you calculate the local Nusselt number at the wall?
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April 7, 2012, 17:02 |
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#4 |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
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See this link. This is the code for local Nusselt number calculation:
http://www.cfd-online.com/Forums/ope...lt-number.html Thanks Goutam |
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April 7, 2012, 17:09 |
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#5 |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
Rep Power: 15 |
Procedure of calculation of Average Nusselt number:
Three ways: 1) in your code, sum all your Nusselt number values for one patch (not all patches) times de area of each element; sum all areas of elements/cells of the same patch; divide the nusselt values sum by the area sum 2) in paraFoam, use filter "extractBlock" to extract the patch you want the average, use filter "integrate variables", it will open an spreadsheet, look for Area value in Cells or Points, look for Nusselt value in Cells or Points, divide Nusselt integrated value by the Area integrated value. 3) write this in the terminal: patchAverage localNusselt patchName |
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August 29, 2012, 05:17 |
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#6 |
New Member
DPAN
Join Date: Aug 2012
Posts: 2
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How to calculate Average Nusselt number over the whole surface in COMSOL?
(I am cosidering a square cavity) Can you help me? Thanks in advance. |
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August 29, 2012, 05:35 |
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#7 | |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
Rep Power: 15 |
Quote:
Consider the nondimensional expression for Nu. Say, Nu = Integrate ( dT/dx ) dx. Then chose the heated wall and write the expression Tx. It will give you average Nusselt number. |
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September 2, 2012, 18:33 |
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#8 |
New Member
DPAN
Join Date: Aug 2012
Posts: 2
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Dear Gautam,
Could you please explain me the procedure how to do it, as you explained in your earlier post? |
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July 22, 2013, 00:27 |
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#9 | |
New Member
M J Alam Khan
Join Date: Jul 2013
Posts: 1
Rep Power: 0 |
Quote:
This equation is applicable to a flat wall. How do I calculate the Nusselt number along a Circular surface in comsol? Thanks |
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