# DG postprocessing

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 May 22, 2008, 08:40 DG postprocessing #1 jack Guest   Posts: n/a 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

 May 22, 2008, 16:21 Re: DG postprocessing #2 jinwon park Guest   Posts: n/a If your DG code is based on modal approximation, you can choose the piecewise-constant value at the cell center.

 May 23, 2008, 05:15 Re: DG postprocessing #3 jack Guest   Posts: n/a but i choose the nodal basis,the modal basis DG is underbuiding

 May 23, 2008, 05:19 Re: DG postprocessing #4 Jinwon Guest   Posts: n/a Can I ask you something? Why did you begin with nodal based one? I wonder if there are differences between one another.

 May 23, 2008, 12:06 Re: DG postprocessing #5 jack Guest   Posts: n/a nodal basis belong to H adpapive,while modal basis can build P apdapive

 May 23, 2008, 12:08 Re: DG postprocessing #6 Praveen. C Guest   Posts: n/a 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.

 May 23, 2008, 15:11 Re: DG postprocessing #7 Jed Guest   Posts: n/a Nodal bases produce natural sparse preconditioning matrices.

 May 23, 2008, 17:51 Re: DG postprocessing #8 jinwon park Guest   Posts: n/a So, can you insist that one is superior than another?

 May 23, 2008, 23:50 Re: DG postprocessing #9 jack Guest   Posts: n/a but where to get NS2KE?

 May 24, 2008, 01:56 Re: DG postprocessing #10 Praveen. C Guest   Posts: n/a http://pauillac.inria.fr/cdrom/www/nsc2ke/eng.htm See the files result.f and isovat.f in nsc2ke.

 May 25, 2008, 23:05 Re: DG postprocessing #11 jack Guest   Posts: n/a thank you very much

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