Computing Phase Speeds at Open Boundary
Publication: Journal of Hydraulic Engineering
Volume 116, Issue 4
Abstract
In the course of modeling hydrodynamic phenomena in a limited area domain, one must specify open boundary conditions. Various forms of the Sommerfeld radiation condition have been used on the boundary of the domain, in the past, to permit internal disturbances to pass unhindered through the boundary. This article shows that if one tries to compute the phase speed associated with the Sommerfeld condition, inevitable numerical errors in this computation adversely affect the interior solutions. A recursive filter that results in smooth, accurate phase speeds and therefore better interior solutions is proposed and its utility demonstrated.
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Published In
Journal of Hydraulic Engineering
Volume 116 • Issue 4 • April 1990
Pages: 592 - 597
Copyright
Copyright © 1990 ASCE.
History
Published online: Apr 1, 1990
Published in print: Apr 1990
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