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Old   May 22, 2008, 08:40
Default DG postprocessing
  #1
jack
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in discontinuous galerkin method,a node varible may be shared by different cell,thus it has multivalues.because i want to plot a pressure isoline,and how do i treat the multivalues in the node in TECPLOT? thanks a lot
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Old   May 22, 2008, 16:21
Default Re: DG postprocessing
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jinwon park
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If your DG code is based on modal approximation, you can choose the piecewise-constant value at the cell center.
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Old   May 23, 2008, 05:15
Default Re: DG postprocessing
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jack
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but i choose the nodal basis,the modal basis DG is underbuiding
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Old   May 23, 2008, 05:19
Default Re: DG postprocessing
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Jinwon
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Can I ask you something? Why did you begin with nodal based one? I wonder if there are differences between one another.
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Old   May 23, 2008, 12:06
Default Re: DG postprocessing
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jack
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nodal basis belong to H adpapive,while modal basis can build P apdapive
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Old   May 23, 2008, 12:08
Default Re: DG postprocessing
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Praveen. C
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Here is a suggestion.

Plot contours within each element. You could divide each element into smaller elements thus creating new nodes. Then set the solution at these nodes using the DG solution. Use these to plot the contours. The solution is discontinuous across elements. So you cannot any standard software. You can generate a contour data file which can be used with gnuplot. This way you will be able to visualize the discontinuous solution. See NS2KE for a subroutine which generates data for gnuplot contour visualization.
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Old   May 23, 2008, 15:11
Default Re: DG postprocessing
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Jed
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Nodal bases produce natural sparse preconditioning matrices.
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Old   May 23, 2008, 17:51
Default Re: DG postprocessing
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jinwon park
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So, can you insist that one is superior than another?
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Old   May 23, 2008, 23:50
Default Re: DG postprocessing
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jack
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but where to get NS2KE?
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Old   May 24, 2008, 01:56
Default Re: DG postprocessing
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Praveen. C
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http://pauillac.inria.fr/cdrom/www/nsc2ke/eng.htm

See the files result.f and isovat.f in nsc2ke.
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Old   May 25, 2008, 23:05
Default Re: DG postprocessing
  #11
jack
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thank you very much
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