DG method, periodic BC

Wenjun · April 19, 2013, 00:12

Hi! How can I apply the periodic boundary condition when I use the DG method for just 1D parabolic equations like KdV ? Suppose I have N cells and the grid is [x(1), x(2), ...x(N+1)]

cfdnewbie · April 19, 2013, 06:19

You apply the BCs in DG through your fluxes in a weak form.

Wenjun · April 19, 2013, 06:23

Quote:

Originally Posted by cfdnewbie

You apply the BCs in DG through your fluxes in a weak form.

Thanks, I understand now. Another question, the time step is very small when I apply the local DG method to the KdV equation. Does there exist some rules like dt = c*dx^3 ?

April 19, 2013, 00:12	DG method, periodic BC	#1
Wenjun New Member Join Date: Mar 2013 Posts: 14 Rep Power: 13	Hi! How can I apply the periodic boundary condition when I use the DG method for just 1D parabolic equations like KdV ? Suppose I have N cells and the grid is [x(1), x(2), ...x(N+1)]

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April 19, 2013, 06:19		#2
cfdnewbie Senior Member cfdnewbie Join Date: Mar 2010 Posts: 557 Rep Power: 20	You apply the BCs in DG through your fluxes in a weak form.