absorbing boundary conditions for PDE's?

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#291

From: R Enns
Date: Wed, 15 Apr 1992 05:31

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Does anyone have any experience with absorbing boundary conditions for PDE's?
I am solving the generalized nonlinear Schroedinger equation: 

         2i E    +   E    +    E    +    E     +  f(I=|E|^2) E  =  0
             t        xx        yy        zz

using the split-step Fourier method (SSFM) on a 128^3 mesh.  The interesting
physics is occurring at the center of my lattice and I would like to absorb
as much as possible of whatever hits the boundaries.  My pedestrian experiments
with various boundary dampings simply create near total reflections.

Any advice is sincerely appreciated.  Is 5-10% reflection achievable without
much effort?
 

-- 

Darran Edmundson
darran@chaos.phys.sfu.ca

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Path: arc1-ca.pugleaf.net!sparky!uunet!van-bc!ubc-cs!newsserver.sfu.ca!sfu.ca!renns
From: renns@fraser.sfu.ca (R Enns)
Subject: absorbing boundary conditions for PDE's?
Message-ID: <renns.703315913@sfu.ca>
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Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Wed, 15 Apr 1992 05:31:53 GMT
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