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Finding mean flow in fluent

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Old   December 12, 2014, 00:45
Default Finding mean flow in fluent
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I have been doing transient analysis of fluid flow(compressible) and is unable to plot the mean flow as that would give me a clear picture of the flow physics. Saving all the iterations will lead to data burst and hence I am looking for some way to find the mean flow without hampering my disk space. I would be highly obliged if somebody can give me an idea. Thanks in advance.
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Old   December 12, 2014, 01:56
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Create a UDF and UDMs that calculate the mean on the fly?
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Old   December 12, 2014, 03:07
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saurav, you need to do data sampling, means after a specific time when you think steady state is reached, just turn the data sampling tab on, in the results you will get transient averaged results.
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Old   December 12, 2014, 03:12
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Can u elucidate a bit more on data sampling....I know how to save the data files in fluent..the problem is finding the mean flow.....A bit confused on this one...Thnks in advance...
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Old   December 12, 2014, 04:40
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What do you mean with mean flow? Simply the mean velocity magnitude? Or something else? please elaborate a bit.

If you mean mean velocity magnitude, or something likewise: make a volume monitor or surface monitor, depending on the domain you want to take the average over. Select the appropriate bodies or planes, the quantity you want to monitor, and select volume-average or surface-average as the report type.
On the left side of the window, tick write and give a filename, select the output frequency and x-axis type (iteration, timestep or flow time)

The written file is a .out file, which is simply a text file that you can load into excel, matlab, or your own program of choice, to plot <variable> versus time.

Good luck!
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Old   December 12, 2014, 05:37
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I guess you want the time-averaged values of your transient simulation for ALL variables in the WHOLE fluid domain.
The easiest way to get these values is the "data sampling for time statistics" option in Fluent. Of course you have to activate this option BEFORE you actually run the simulation.
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