# Residual Curve

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 November 28, 2011, 03:45 Residual Curve #1 New Member   Nilesh Tank Join Date: Oct 2011 Location: India Posts: 5 Rep Power: 6 Hello Everyone, Can anybody suggest me how to plot residual curve in para-view? and how to get co-efficient of pressure plot. Cause only pressure plot is coming.

 November 28, 2011, 03:56 #2 Senior Member     Roman Thiele Join Date: Aug 2009 Location: Stockholm, Sweden Posts: 366 Rep Power: 13 paraview won't plot your residual plot, since the data is not stored in any of the fields. if you want a residual plot you should take a look at this thread Tutorial of how to plot residuals ! what kind of coefficients do you mean? __________________ ~roman

 November 28, 2011, 04:02 Residual curve:- #3 New Member   Nilesh Tank Join Date: Oct 2011 Location: India Posts: 5 Rep Power: 6 Hello Roman, I am asking about co-efficient of pressure for external aerodynamic problem.

 November 28, 2011, 04:04 #4 Senior Member     Roman Thiele Join Date: Aug 2009 Location: Stockholm, Sweden Posts: 366 Rep Power: 13 you have to calculate those from the force balances you probably want to have have the lift and drag coefficient. have a look at the function object and how to calculate the force coefficients. i think i have seen similar threads in the forum. __________________ ~roman

 January 23, 2012, 05:43 #5 Senior Member     Mads Reck Join Date: Aug 2009 Location: Copenhagen, Denmark Posts: 175 Rep Power: 10 Hey, I guess you now know how to get the residuals, right? For the pressure coefficient, you could use ParaView (you need a reasonably new version). Read your geometry into ParaView and do a PlotOnIntersectionCurves - then you can get the surface pressure out and eventually compute your pressure coefficient either inside ParaView or outside it (which is what I do). Mads Tobias Adam likes this. __________________ Online free airfoil-mesher for OpenFOAM here

 January 23, 2012, 12:59 Thanks #6 New Member   Nilesh Tank Join Date: Oct 2011 Location: India Posts: 5 Rep Power: 6 Hello Madsr, yes i can plot residuals now, i will try as per your suggestion. Thanks and regards, Nilesh

April 2, 2012, 10:14
#7
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Join Date: May 2010
Posts: 61
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Quote:
 Originally Posted by Nilesh_87 Hello Madsr, yes i can plot residuals now, i will try as per your suggestion. Thanks and regards, Nilesh
Hi Nilesh, how did you plot residuals in ParaView? would you like to tell me?
Thank you!
Wei.

April 28, 2013, 03:43
#8
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Join Date: Aug 2012
Posts: 229
Rep Power: 7
Quote:
 Originally Posted by MadsR Hey, I guess you now know how to get the residuals, right? For the pressure coefficient, you could use ParaView (you need a reasonably new version). Read your geometry into ParaView and do a PlotOnIntersectionCurves - then you can get the surface pressure out and eventually compute your pressure coefficient either inside ParaView or outside it (which is what I do). Mads

how can i use PlotOnIntersectionCurves
in paraview? i don't know what normal i should use, x y or z ?
i put my VTK file of the airfoil and the forceCoeffs on it in the following, would you please please give me some advice to use PlotOnIntersectionCurves?
thank you very very much
Attached Images
 sss.jpg (21.9 KB, 7 views)
Attached Files
 airfoil_airfoil.tar.gz (17.8 KB, 3 views) forces.tar.gz (23.0 KB, 3 views) forceCoeffs.tar.gz (6.5 KB, 4 views)

 April 28, 2013, 12:30 #9 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 9,635 Blog Entries: 39 Rep Power: 99 FYI: I've answered to Saeideh Mohamadi on the following thread: plot cp on airfoils MadsR likes this. __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

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