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[Getfem-users] How to impose radiation boundary condition of heterogeneo

From: CC Tsai
Subject: [Getfem-users] How to impose radiation boundary condition of heterogeneous Helmholtz equation
Date: Tue, 23 Aug 2011 16:29:51 +0800

Dear All,

We appreciate the innovation of GetFem++. 

Recently, we tried to apply the GetFem++ to a problem governed by heterogeneous Helmholtz equation. We can find the system matrix by the generic assembly procedures. However, we don't known how to  impose radiation boundary condition which involves high-order mixed derivatives (see for details). We will be very glad to have your suggestions.

On the other hand, If we have a function on grid points, what is the easiest way to interpolate it and get its derivatives? Do we need to establish a mesh and then interpolate it? 

best regard,

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