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calculation of average nusselt number

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Old   June 18, 2015, 08:12
Default calculation of average nusselt number
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abhishek chakrabarti
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hi, I am simulating a lid-driven cavity flow problem in ANSYS FLUENT. in my case, i am dealing with a square cavity with rigid walls having no inlet or outlet,i.e., the fluid is confined within the cavity.the left wall is moving vertically upwards while all the other walls are fixed in position. now, after the simulation is over, i want to calculate the average nusselt number over the moving left surface. I have done the following: Reports>Surface Integrals>Wall Fluxes>Surface Nusselt Number and then selecting Area Weighted Average from the drop down list but the Nusselt Number I am getting is an absurd value.
can anyone tell me how to do this????
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Old   June 18, 2015, 09:37
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Gustavo
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The Nusselt number exported by Fluent is based on the "Reference Values" tab, so it doesn't work very well for anything other than an external flow along a horizontal plate.

In order to calculate the Nusselt number, you will have to export the results and treat the data elsewhere (Matlab or whatever) or write a Perl script to calculate Nu in CFD-Post.

There is no way to automatically calculate the Nusselt number in Fluent, and I don't think there will be anytime soon.
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Old   June 19, 2015, 05:19
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abhishek chakrabarti
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can u tell me how to do this.i mean can u suggest me any one or two methods and how to proceed.i want to know how to export fluent data and then treat it elsewhere.and what is a perl script in cfd post???
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