DG method, periodic BC

Wenjun · April 18, 2013, 23:12

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, 05:19

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

Wenjun · April 19, 2013, 05:23

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 18, 2013, 23:12	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)]

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Symmetry and Periodic boundary conditions	CFD_Fluent_User	FLUENT	1	October 16, 2014 02:18
Lattice Boltzmann method vs Finite Element Method and Finite Volume Method	solemnpriest	Main CFD Forum	3	August 12, 2013 11:00
[ICEM] how to define periodic in icem ?	mingersai	ANSYS Meshing & Geometry	1	February 3, 2012 17:46
rotational periodic boundary conditions in ICEM	user0314	ANSYS Meshing & Geometry	1	June 21, 2011 01:57
Info on method of lines approach	charlie ryan	Main CFD Forum	2	August 9, 2007 11:06

April 19, 2013, 05:19		#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.