HR: 09:00h
AN: OS41A-05    [Abstracts]
TI: A Pretty Good Sponge
AU: * Lavelle, J
EM: J.William.Lavelle@noaa.gov
AF: NOAA/Pacific Marine Environmental Laboratory, 7600 Sand Point Way N.E., Seattle, WA 98115, United States
AU: Thacker, W
EM: carlisle.thacker@noaa.gov
AF: NOAA/Atlantic Oceanographic and Meteorological Laboratory, 4301 Rickenbacker Causeway, Miami, FL 33149, United States
AB: Comparisons are made of the effectiveness of sponge formulations for the suppression of outgoing waves at the edges of two-dimensional open computational domains. Results using perfectly matched layers (PML) are compared to those of a pretty good sponge (PGS). PGS has cabilities nearly matching those of the PML, while being much easier to implement. Evaluations have been made in the context of the linear and non-linear rotating shallow water wave equations with and without imposed background flows. With background flow, PGS becomes a very specific type of nudging or forcing sponge or flow relaxation scheme. An example of internal wave generation over a ridge shows the extendibility of PGS to three dimensional baroclinic problems. Together results show that PGS is an effective and computationally simple way to arrest outgoing waves in a large class of limited domain, ocean wave scattering problems.
DE: 0545 Modeling (4255)
DE: 0560 Numerical solutions (4255)
DE: 4255 Numerical modeling (0545, 0560)
SC: Ocean Sciences [OS]
MN: 2007 Joint Assembly