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How numerical dissipation supress aliasing error?

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Old   March 10, 2009, 04:26
Default How numerical dissipation supress aliasing error?
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hades
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I try to use upwind difference scheme to supress aliasing error.It is said that by modified number analysis, if the imaginary part of the modified number wave number of a numerical scheme is negative, then such a scheme is dissipative. But I don't understand how such a scheme can supress aliasing error. Anyone know?

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