How to do linear fit to some points in Openfoam?

bigfeather · November 5, 2016, 06:40

Hi All

At each calculating time step, I obtain the positions for some particular points in OpenFoam. For example, these points have velocity larger than 100 m/s. Their positions change with run-time.

The format of the postions of these points are as follows:

point 1 (x1, y1)
point 2 (x2, y2)
point 3 (x3, y3)
point 4 (x4, y4)
.....

I need to do a linear fit to all of these points and get the slope of the fitting line.

Is there any existing function or library in OpenFOAM I can directly use?

Many thanks!

bigfeather · November 7, 2016, 06:39

Anyone knows how to do it? Thanks.

khedar · November 14, 2016, 18:19

Maybe you can try 'probes':

http://cfd.direct/openfoam/user-guid...hs-monitoring/

November 5, 2016, 06:40	How to do linear fit to some points in Openfoam?	#1
bigfeather New Member Jun Zhang Join Date: Jan 2014 Posts: 12 Rep Power: 12	Hi All At each calculating time step, I obtain the positions for some particular points in OpenFoam. For example, these points have velocity larger than 100 m/s. Their positions change with run-time. The format of the postions of these points are as follows: point 1 (x1, y1) point 2 (x2, y2) point 3 (x3, y3) point 4 (x4, y4) ..... I need to do a linear fit to all of these points and get the slope of the fitting line. Is there any existing function or library in OpenFOAM I can directly use? Many thanks! Last edited by bigfeather; November 5, 2016 at 06:43. Reason: For clarity

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November 7, 2016, 06:39		#2
bigfeather New Member Jun Zhang Join Date: Jan 2014 Posts: 12 Rep Power: 12	Anyone knows how to do it? Thanks.

November 14, 2016, 18:19		#3
khedar Senior Member khedar Join Date: Oct 2016 Posts: 111 Rep Power: 10	Maybe you can try 'probes': http://cfd.direct/openfoam/user-guid...hs-monitoring/