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May 7, 2013, 05:12 |
How to output the Nusselt number
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#1 |
New Member
刘朝福
Join Date: May 2013
Posts: 8
Rep Power: 12 |
I calculate a jet cooling problems use Openfoam,Then I use the Tecplot post-processing,But I can't output the Nusselt number,or the heat transfer coefficient。Who can help me?
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May 7, 2013, 07:56 |
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#2 | |
Senior Member
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Quote:
Well, you can output the variable using utility, please refer the following link for more information... http://www.cfd-online.com/Forums/ope...timesteps.html |
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May 8, 2013, 09:26 |
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#3 |
New Member
刘朝福
Join Date: May 2013
Posts: 8
Rep Power: 12 |
Thank you for your reply.Because I am a newbie on OpenFoam,I only can output the temperature and speed using Tecplot.Can you tell me what variables wo should output to get Nusselt number and the methods.Thank you .
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May 8, 2013, 09:33 |
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#4 |
New Member
刘朝福
Join Date: May 2013
Posts: 8
Rep Power: 12 |
I have to OpenFoam version 2.1.1. I want to use the wall heat flux function.But when I enter this command.It shows this function could not be found.How should I set.Because I is the isothermal wall condition.I need to output the wall heat flux to calculate heat transfer coefficient
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May 8, 2013, 09:44 |
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#5 | |
Senior Member
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Quote:
In the weblink: http://www.cfd-online.com/Forums/ope...timesteps.html Check this code: ################### volScalarField gradT ( IOobject ( "gradT", runTime.timeName(), mesh, IOobject::NO_READ, IOobject::AUTO_WRITE ), mesh, dimensionedVector ( "gradT", T.dimensions()/dimLength, 0 ) ); label patchi = mesh.boundaryMesh().findPatchID("myPatch"); gradT.boundaryField()[patchi]=T.boundaryField()[patchi].snGrad(); runTime.write(); ##################### This is similar to the $utility/Postprocessing/wall/wallGradU file. Copy this file and make new wallGradT file. You need to put T instead of U, as mentioned above. Then try to compile the same. After you finish with this, run the utility in the case folder. |
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