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Drag force calculation using URANS

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Old   September 13, 2017, 12:26
Question Drag force calculation using URANS
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Felipe Silva Maffei
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Hi,

I'm working in my end-of-graduation-course paper, it's ,briefly speaking, a study about the flow behavior under a NACA0015 with a flap and gurney flap. Becouse of the size mesh and turbulence model, a steady state simulation do not converge (residual target 1e-6), so I used URANS. I know how to calculate the average of variables, but, here is my question, can I calculate the average of drag force?

Last edited by Maffei; September 13, 2017 at 12:28. Reason: erro in title
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Old   September 13, 2017, 19:06
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Glenn Horrocks
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If I was doing this I would:

* Make a monitor point which had the drag force.
* Run the simulation
* make a solver monitor to display the drag force for each time step. Make the X axis time, not iteration number
* Export the data to a csv file
* Load the CSV into excel, matlab, python or whatever you use for mathematics and calculate time averages or whatever you want.
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Old   September 16, 2017, 20:48
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Felipe Silva Maffei
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thanks for answering,

I need to do the average of drag force acting under the airfoil,I think that this resolution will not work. Am I correct?
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Old   September 17, 2017, 21:01
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You think the Resolution of what will not work?
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Old   September 18, 2017, 00:22
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Felipe Silva Maffei
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no, my question is whether I can set up the bondary at CFX pre.
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Old   September 18, 2017, 00:38
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Glenn Horrocks
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I do not understand your question. Can you say what your question is again, but more clearly?
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