how to extract properties in a patch at a certain time domain?

immortality · January 6, 2013, 03:44

hi all
I need to obtain an average of pressure,velocity and temperature at a patch at last for example 100 time steps.how can i do this?i should add a sampledict at first before starting to run(if yes what codes should add to controldict?) or can it be done after running?if latter what are the codes?
Thanks for advices.

mkraposhin · January 7, 2013, 00:19

you can use patchAverage utility with keys -latestTime (for latest time slice) or key -time .... (to set time range)

immortality · January 7, 2013, 03:34

thanks.could you give an example?is it correct? patchAverage rightside -time .003 .004
Then where the property is assign?

mkraposhin · January 7, 2013, 06:46

--- "patchAverage -time '0.01,0.02' alpha1 heated" to see patch average 'heated' of field 'alpha1' for times 0.01 and 0.02

--- "patchAverage -time '0.01:0.02' alpha1 heated" to see patch average 'heated' of field 'alpha1' for times in range from 0.01 to 0.02 (including boundaries)

immortality · January 7, 2013, 07:25

thanks alot!
So if we want average of for example pressure on all the cells of a patch only in one time step it's true

atchAverage -time '.01' p rightpatch
Isn't it?
What you mean about all boundaries in the case of time range?

mkraposhin · January 7, 2013, 11:42

i mean: from from time t1 to time t2, including time points t1 and t2

immortality · January 7, 2013, 12:21

grasped!thanks.is that correct what I said about one time step?does it give average of field over all the cells on the specified patch?
thanks again.

mkraposhin · January 7, 2013, 16:23

no, it will return average of external faces values (not the same as cell values). but this is true for zeroGradient patches (because values at cell centres and face centres, belonging to patch are same)

immortality · January 7, 2013, 17:16

thank you very much dear matvej.

January 6, 2013, 03:44	how to extract properties in a patch at a certain time domain?	#1
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	hi all I need to obtain an average of pressure,velocity and temperature at a patch at last for example 100 time steps.how can i do this?i should add a sampledict at first before starting to run(if yes what codes should add to controldict?) or can it be done after running?if latter what are the codes? Thanks for advices.

January 7, 2013, 07:25		#5
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	thanks alot! So if we want average of for example pressure on all the cells of a patch only in one time step it's trueatchAverage -time '.01' p rightpatch Isn't it? What you mean about all boundaries in the case of time range?

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January 7, 2013, 00:19		#2
mkraposhin Senior Member Matvey Kraposhin Join Date: Mar 2009 Location: Moscow, Russian Federation Posts: 355 Rep Power: 21	you can use patchAverage utility with keys -latestTime (for latest time slice) or key -time .... (to set time range)

January 7, 2013, 03:34		#3
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	thanks.could you give an example?is it correct? patchAverage rightside -time .003 .004 Then where the property is assign?

January 7, 2013, 06:46		#4
mkraposhin Senior Member Matvey Kraposhin Join Date: Mar 2009 Location: Moscow, Russian Federation Posts: 355 Rep Power: 21	--- "patchAverage -time '0.01,0.02' alpha1 heated" to see patch average 'heated' of field 'alpha1' for times 0.01 and 0.02 --- "patchAverage -time '0.01:0.02' alpha1 heated" to see patch average 'heated' of field 'alpha1' for times in range from 0.01 to 0.02 (including boundaries)

January 7, 2013, 11:42		#6
mkraposhin Senior Member Matvey Kraposhin Join Date: Mar 2009 Location: Moscow, Russian Federation Posts: 355 Rep Power: 21	i mean: from from time t1 to time t2, including time points t1 and t2

January 7, 2013, 12:21		#7
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	grasped!thanks.is that correct what I said about one time step?does it give average of field over all the cells on the specified patch? thanks again.

January 7, 2013, 16:23		#8
mkraposhin Senior Member Matvey Kraposhin Join Date: Mar 2009 Location: Moscow, Russian Federation Posts: 355 Rep Power: 21	no, it will return average of external faces values (not the same as cell values). but this is true for zeroGradient patches (because values at cell centres and face centres, belonging to patch are same)

January 7, 2013, 17:16		#9
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	thank you very much dear matvej.