On Wed, Jul 9, 2008 at 7:56 PM, Maxime Debon
<[EMAIL PROTECTED]> wrote:

> NB: To implement the Neumann condition in a transient case, I finally
> used, on the boundary, a finite difference approximation.

This seems like it could be a problem if not done correctly at higher orders.

What norm are you using to measure the error, and how are you computing it?

-- 
John

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