
[Sponsors] 
May 25, 2014, 19:39 
Calculating and Plotting Nusselt Number with ParaView

#1 
New Member
Tom
Join Date: Jun 2013
Posts: 26
Rep Power: 5 
Hi!
I have been working with OpenFOAM and some GUI (HelyxOS). Am simulating cases with conjugated heat transfer and I would like to Plot the Nusselt Number with ParaView, however I don't know how to calculate it with OpenFOAM. I do can calculate the Nusselt Field in ParaView, but I can't Plot it over a line (That's my goal). At the beginning I downloaded the last version of ParaView because the version of OpenFOAM (sudo aptget install paraviewopenfoam410) cannot use the "Calculator application" properly. So I downloaded the binary files from www.paraview.org. Now what I need is to plot the Nusselt Number over a line, but it does not let me do it with my Calculated Nusselt. 

June 8, 2014, 13:40 

#2 
Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 9,748
Blog Entries: 39
Rep Power: 103 
Greetings Tom,
I have no idea if you've managed to solve this issue already or not, but if you haven't, please provide more information, namely:
Best regards, Bruno
__________________


April 26, 2016, 09:34 
finding Nusselt number in paraview

#3 
New Member
narayana vekamulla
Join Date: Oct 2015
Posts: 13
Rep Power: 3 
Good evening Bruno,
i dont have any idea how to calculate derivatives and integrations in paraview. If you know how to calculate Nusselt number and Mean Nusslet number? please let me know. Thanks 

April 26, 2016, 14:49 

#4 
Senior Member
Tobias Holzmann
Join Date: Oct 2010
Location: Leoben (Austria)
Posts: 1,554
Blog Entries: 6
Rep Power: 27 
As far as I know, the Nusselt number can only be calculated on the walls because of its definition:
The heat transfer coefficient could be calculated using the heat flux or heat : Due to the fact that there has to be an equilibrium of CellCenter to FaceCenter and FaceCenter out to air or even another fluid / solid, So finally you know or and you can calculate . Then you simply can calculate the Nusselt number.
__________________
Best regards, Tobias Holzmann Some interesting OpenFOAM tutorials, publications and videos on www.Holzmanncfd.de OpenFOAM Beginners should check out the new wiki on wiki.openfoam.com A list of some active OpenFOAM contributers can be found »here« A book about the basics of »Mathematics, Numerics, Derivations and OpenFOAM« can be found on www.Holzmanncfd.de 

May 3, 2016, 13:58 

#5  
Member
Lisandro Maders
Join Date: Feb 2013
Posts: 67
Rep Power: 5 
Quote:
I am new to ParaView, could you explain to me how to get the or values from Paraview? I have a cylinder and need to know the dissipated heat through its external surface. What I would imagine to do: take temperature value of facecenter cell of external surface cells; take temperature of respective volumecenter cell; calculate its difference corresponding to a gradient in relation to cell size; do this for all external cells areas (integrate it); muliply by conductivity; The problem is that I don't know how to do it with ParaView... :P Thank you! Regards, Lisandro Maders Last edited by Lisandro Maders; May 3, 2016 at 14:22. Reason: better explanation of what I want 

May 3, 2016, 17:39 

#6 
Senior Member
Tobias Holzmann
Join Date: Oct 2010
Location: Leoben (Austria)
Posts: 1,554
Blog Entries: 6
Rep Power: 27 
I do not know if you can do this with paraview.
You can do it with openfoam tools (wallHeatFlux).
__________________
Best regards, Tobias Holzmann Some interesting OpenFOAM tutorials, publications and videos on www.Holzmanncfd.de OpenFOAM Beginners should check out the new wiki on wiki.openfoam.com A list of some active OpenFOAM contributers can be found »here« A book about the basics of »Mathematics, Numerics, Derivations and OpenFOAM« can be found on www.Holzmanncfd.de 

May 3, 2016, 17:42 

#7  
Member
Lisandro Maders
Join Date: Feb 2013
Posts: 67
Rep Power: 5 
Quote:
Anyway, cheers! 

May 3, 2016, 17:56 

#8  
Senior Member
Tobias Holzmann
Join Date: Oct 2010
Location: Leoben (Austria)
Posts: 1,554
Blog Entries: 6
Rep Power: 27 
Quote:
if you use the openfoam utilities, why you are asking? OpenFOAM have the ability that a lot of functions are already there (like the calculation of the gradient of the cellcenter and boundary facecenter). I do not know if you can do this using paraview (maybe there is some workaround but I do not know it).
__________________
Best regards, Tobias Holzmann Some interesting OpenFOAM tutorials, publications and videos on www.Holzmanncfd.de OpenFOAM Beginners should check out the new wiki on wiki.openfoam.com A list of some active OpenFOAM contributers can be found »here« A book about the basics of »Mathematics, Numerics, Derivations and OpenFOAM« can be found on www.Holzmanncfd.de 

May 3, 2016, 17:58 

#9 
Member
Lisandro Maders
Join Date: Feb 2013
Posts: 67
Rep Power: 5 
Actually, I was really making mess with this. Long day and I was tired. There is no reason for not using foam utilities, I just forgot everything I learned for some hours haha. But thanks anyway, I could be still struggling with this


Tags 
calculate, nusselt number, paraview 4.1 
Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
calculating n plotting moments coefficients  maperik  CFX  2  June 20, 2011 09:59 