probes

openfoam_user · September 10, 2013, 13:11

Hi OF-users,

I want to use the probeLocations command with the system/probesDict file.
I want to sample the velocity for circa 20000 points.

But all data are written on 1 line in the resulting file (postProcessing/probes/0.05/U)

Someone knows a way to get the resulting data written on 20000 lines (1 line for 1 point).

Best regards,
Stephane.

Lieven · September 10, 2013, 13:32

Hi Stephane,

This is explicitly programmed like this. The main reason is that new values the next time step are added as a new line (which is far easier than adding a new column).

So if you want your data to be written as new 20000 lines, I'm afraid you will need to make your own version of probes.C and patchProbesTemplates.C

Cheers,

L

openfoam_user · September 10, 2013, 13:40

Hi Lieven

Often it is not easy to understand how post-processing programming in OpenFOAM has been written.

My example: probeLocations (points) are written in rows and resulting data are given in columns !!!

Stephane.

Bernhard · September 11, 2013, 01:57

For probes it is very easy: one colum per probe point and one row per time instance. I don't know how smoothly this works for 20k probing points, because that is probably not the intended use.

What are you actually trying to achieve? There is probably at better approach than using 20k points, as you are not going to look at every single one of them. (Is the a XY problem? http://mywiki.wooledge.org/XyProblem )

September 10, 2013, 13:11	probes	#1
openfoam_user Senior Member stephane sanchi Join Date: Mar 2009 Posts: 314 Rep Power: 18	Hi OF-users, I want to use the probeLocations command with the system/probesDict file. I want to sample the velocity for circa 20000 points. But all data are written on 1 line in the resulting file (postProcessing/probes/0.05/U) Someone knows a way to get the resulting data written on 20000 lines (1 line for 1 point). Best regards, Stephane.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
probes function not working in Openfoam 2.1.1	nandiganavishal	OpenFOAM	7	July 26, 2012 11:06
Probes	dhruv	OpenFOAM	3	October 5, 2011 12:59
Error using probes	balkrishna	OpenFOAM Running, Solving & CFD	6	November 12, 2010 04:55
probes for a component of a volTensorField	titio	OpenFOAM Post-Processing	0	July 2, 2010 13:50
problems with probes() function in chtMultiRegionFoam	Victor	OpenFOAM	0	November 25, 2009 15:08

September 10, 2013, 13:32		#2
Lieven Senior Member Lieven Join Date: Dec 2011 Location: Leuven, Belgium Posts: 299 Rep Power: 22	Hi Stephane, This is explicitly programmed like this. The main reason is that new values the next time step are added as a new line (which is far easier than adding a new column). So if you want your data to be written as new 20000 lines, I'm afraid you will need to make your own version of probes.C and patchProbesTemplates.C Cheers, L

September 10, 2013, 13:40		#3
openfoam_user Senior Member stephane sanchi Join Date: Mar 2009 Posts: 314 Rep Power: 18	Hi Lieven Often it is not easy to understand how post-processing programming in OpenFOAM has been written. My example: probeLocations (points) are written in rows and resulting data are given in columns !!! Stephane.

September 11, 2013, 01:57		#4
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	For probes it is very easy: one colum per probe point and one row per time instance. I don't know how smoothly this works for 20k probing points, because that is probably not the intended use. What are you actually trying to achieve? There is probably at better approach than using 20k points, as you are not going to look at every single one of them. (Is the a XY problem? http://mywiki.wooledge.org/XyProblem )