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Thrust of a pipe flow

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Old   January 18, 2016, 11:50
Default Thrust of a pipe flow
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I have an unsteady pipe flow (sinusoidal velocity profile) which outputs into a large domain. The geometry is specified as 'axisymmetric'.

I want to measure the thrust of the jet a short distance downstream of the pipe exit, how can I do this?

I know I can monitor the pressure, velocity and density at a range of monitor points and then put them in a momentum balance equation etc. but the only way I know how to do that is setting up parameter points at each monitor point individually. Say I had 20 monitor points, that would create 60 output files to then process which isn't ideal. I have tried using a 'rake' but am unsure what data that is outputting as it only outputs one value for the whole 'rake'. Would I use integral, mass-averaged, area-averaged?!?! And how would I then calculate the force for fully revolved pipe?

I know there must be a quick and easy way to do this and I have tried looking but it either outputs 'zero' or I'm not certain what it's outputting (and hence how to interpret the value!)

Any help would be hugely appreciated, thank you.
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Old   January 20, 2016, 02:32
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You could create a function, either a custom field function or a UDF for the stream thrust and then you could integrate this stream thrust.
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monitor, output, pipe, thrust

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