NASA NTRS · 19930003110
Spurious Modes in Spectral Collocation Methods with Two Non-Periodic Directions
Abstract
Collocation implementation of the Kleiser-Schumann's method in geometries with two non-periodic directions is shown to suffer from three spurious modes - line, column and checkerboard - contaminating the computed pressure field. The corner spurious modes are also present but they do not affect evaluation of pressure related quantities. A simple methodology in the inversion of the influence matrix will efficiently filter out these spurious modes.
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Balachandar, S., Madabhushi, Ravi K.. 1992-09-01. Spurious Modes in Spectral Collocation Methods with Two Non-Periodic Directions. https://ntrs.nasa.gov/citations/19930003110
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