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Fluent 2D Incorrect massflow using Tecplot 360 2017

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Old   February 12, 2017, 14:12
Unhappy Fluent 2D Incorrect massflow using Tecplot 360 2017
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Paht Thai
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I set up a simple 2D fluent simulation using workbench. I extracted the CAS and DAT files with the results. I then load the results using tecplot. It reads everything just fine except when you go into Perform Integration -> Calculate Massflow at the inlet and outlets, the values are completely wrong compared to using CFDPost to post process.

Has anyone experienced this? How do you overcome it?
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Old   February 13, 2017, 11:42
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Scott Fowler
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pjuangph,

Incorrect results are very concerning to me. I encourage you to contact support@tecplot.com so we can try to figure out what's going on. If you can share data that would help tremendously.

Thanks,
Scott Fowler
Tecplot Product Manager
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Old   February 13, 2017, 18:07
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From Jared,

"I had the opportunity to look into this with our development team and we believe we have found the issue. The CFDA Settings for the Integration, specifically the Fluid Properties, need to be consistent with the data set you have provided. By default the Fluid Properties are set to PLOT3D non-dimensionalized values, but Fluent will generally operate with dimensional values. It appears that your calculation is with air in MKS units, so try setting the Gas Constant to 287 and performing the Mass Flow Rate integration again. I tested this on your data set and got the result of -6.262724e-002, matching the result in CFD-Post.

Let me know if this helps correct the issue you were encountering for your data set, and if this corrects the problems your colleagues were encountering as well."

This is the solution i was looking for. Thanks!

Last edited by pjuangph; February 21, 2017 at 19:22. Reason: updated solution
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