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Reference Values for calculating the pressure coefficients

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Old   February 20, 2018, 15:04
Default Reference Values for calculating the pressure coefficients
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Mehrnoosh Ahmadi
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Hello everybody.
I'm an architect and quite ignorant in fluent. I am having a small building model for which I am trying to analyze the natural ventilation performance.

I am trying to validate the experimental data I got from a wind tunnel test. And I have to get the Pressure Coefficient value at different points in my model. But, the problem is that no matter what pressure/velocity value I set in Fluent Reference Values, it can't seem to calculate the Cp correctly. I have tried to use the static pressure values to calculate the Cp in excel, using the formula Cp=(P-P0)/(0.5*U*U*ro), my results are within a normal range but still very different from the experimental data.

The other problem is that with my fine mesh, the residuals are fluctuating like a sin wave with a period of 3500 iterations!!! I have my mesh checked by other people, and it seems to be fine. I don't know what is it that I am missing...

Have a look at this presentation with all the data in it.

Thank you.
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convergence problem, pressure coefficient, reference values

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