UDF Transient Velocity Date

OpenFOAM-2016 · June 27, 2018, 13:36

Hi everyone

I have a question. I want to apply transient velocity inlet using a set of data that I got during an experiment. So it is hard to find a curve fitting function for that data (And then write that function in the UDF) so I was thinking to see if there is a way to import it as is. Here is one sample of the data:

Time Velocity
0 0
0.02 0.508833333
0.03 1.35
0.04 0.948666667
0.05 0.156666667
0.06 0.175
0.07 0.418666667
0.08 0.203333333
0.09 0.017666667
0.1 0.049333333
0.2 -0.0982
0.4 -0.031433333
0.6 -0.014333333
0.8 -0.014133333
1 -0.0217
1.2 -0.013416667
1.4 -0.019916667
1.6 -0.023066667
1.8 -0.032966667
2 -0.028466667

`e` · June 27, 2018, 19:50

You could add this table as an array within a UDF, and then with a DEFINE_PROFILE macro, use interpolation to get the velocity at each time step for the inlet boundary.

June 27, 2018, 13:36	UDF Transient Velocity Date	#1
OpenFOAM-2016 New Member Mike Join Date: Jul 2016 Posts: 6 Rep Power: 10	Hi everyone I have a question. I want to apply transient velocity inlet using a set of data that I got during an experiment. So it is hard to find a curve fitting function for that data (And then write that function in the UDF) so I was thinking to see if there is a way to import it as is. Here is one sample of the data: Time Velocity 0 0 0.02 0.508833333 0.03 1.35 0.04 0.948666667 0.05 0.156666667 0.06 0.175 0.07 0.418666667 0.08 0.203333333 0.09 0.017666667 0.1 0.049333333 0.2 -0.0982 0.4 -0.031433333 0.6 -0.014333333 0.8 -0.014133333 1 -0.0217 1.2 -0.013416667 1.4 -0.019916667 1.6 -0.023066667 1.8 -0.032966667 2 -0.028466667

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June 27, 2018, 19:50		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	You could add this table as an array within a UDF, and then with a DEFINE_PROFILE macro, use interpolation to get the velocity at each time step for the inlet boundary.