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DG method, periodic BC

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Old   April 19, 2013, 00:12
Post DG method, periodic BC
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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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Old   April 19, 2013, 06:19
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You apply the BCs in DG through your fluxes in a weak form.
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Old   April 19, 2013, 06:23
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Quote:
Originally Posted by cfdnewbie View Post
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 ?
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