Problem with sample utility

roberthino · August 23, 2007, 12:53

hi me again. i read about the sample utility and decided that it is a much cleaner way to plot graphs than probe. my problem is that after i finished a calculation with FoamX and i puch the execute button for sample (configuration: uniform, along a line) it is initializing the mesh and writing something for every iterationstep, but than if i take a look in the dictionary on my hd (sample) and if i go to any iterationstep, there is absolutely no data written there? someone can help?

msrinath80 · August 23, 2007, 14:16

All data extracted using the sample utility gets written to a new directory called samples inside your case.

roberthino · August 23, 2007, 14:21

jup thats what i thought....in that samples directory there are all the iterations steps in new directories. but these directories are empty there is no data

msrinath80 · August 23, 2007, 14:25

That's odd. Do one thing. Use the default caviy case with icoFoam and extract the velocities along a line through the center of the cavity. See if that works first.

jens_klostermann · August 23, 2007, 15:39

Hallo Robert,

1. Which version of OF do you use? I had also some problems with sampling in OF-1.3? Try to change the interpolation in the sampleDict.

2. Make sure your sample line (coordinates of first and last point) is within your domain!

Jens

roberthino · August 23, 2007, 16:14

thx a lot, i use version 1.4......well my first and last point are exactly on my left and right boundary. is that allowed? anyway i am going to try it tomorrow at the pc at work. what do you mean by changing the interpolation? i used uniform and 100 points in between

msrinath80 · August 23, 2007, 16:29

I faced the same problem a while ago[1]. The suggestion was to move to the cloud option as opposed to the line option. Check the thread below for more information.

[1] http://www.cfd-online.com/OpenFOAM_D...es/1/3611.html

August 23, 2007, 12:53	hi me again. i read about the	#1
roberthino Member robert maduta Join Date: Mar 2009 Posts: 33 Rep Power: 17	hi me again. i read about the sample utility and decided that it is a much cleaner way to plot graphs than probe. my problem is that after i finished a calculation with FoamX and i puch the execute button for sample (configuration: uniform, along a line) it is initializing the mesh and writing something for every iterationstep, but than if i take a look in the dictionary on my hd (sample) and if i go to any iterationstep, there is absolutely no data written there? someone can help?

August 23, 2007, 14:16	All data extracted using the s	#2
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	All data extracted using the sample utility gets written to a new directory called samples inside your case.

August 23, 2007, 14:21	jup thats what i thought....in	#3
roberthino Member robert maduta Join Date: Mar 2009 Posts: 33 Rep Power: 17	jup thats what i thought....in that samples directory there are all the iterations steps in new directories. but these directories are empty there is no data

August 23, 2007, 14:25	That's odd. Do one thing. Use	#4
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	That's odd. Do one thing. Use the default caviy case with icoFoam and extract the velocities along a line through the center of the cavity. See if that works first.

August 23, 2007, 15:39	Hallo Robert, 1. Which vers	#5
jens_klostermann Senior Member Jens Klostermann Join Date: Mar 2009 Posts: 117 Rep Power: 17	Hallo Robert, 1. Which version of OF do you use? I had also some problems with sampling in OF-1.3? Try to change the interpolation in the sampleDict. 2. Make sure your sample line (coordinates of first and last point) is within your domain! Jens

August 23, 2007, 16:14	thx a lot, i use version 1.4..	#6
roberthino Member robert maduta Join Date: Mar 2009 Posts: 33 Rep Power: 17	thx a lot, i use version 1.4......well my first and last point are exactly on my left and right boundary. is that allowed? anyway i am going to try it tomorrow at the pc at work. what do you mean by changing the interpolation? i used uniform and 100 points in between

August 23, 2007, 16:29	I faced the same problem a whi	#7
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	I faced the same problem a while ago[1]. The suggestion was to move to the cloud option as opposed to the line option. Check the thread below for more information. [1] http://www.cfd-online.com/OpenFOAM_D...es/1/3611.html

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