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What is the difference between POD and SVD?

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Old   February 15, 2006, 06:52
Default What is the difference between POD and SVD?
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Greene
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I've read some papers about that two subjects while I can not tell the difference between them. Any body can help me?
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Old   February 15, 2006, 18:32
Default Re: What is the difference between POD and SVD?
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Peter Attar
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In POD the fluid variables are written as a linear combination of some global modes..these global modes are computed by taking snapshots of the time history data of the fluid variables, putting them in a matrix, forming a spatial correlation matrix and then computing the eigenvalues/eigenvectors of the corelation matrix. Alternatively you can computed the POD modes by performing an SVD on the matrix of snapshot data. SVD itself is just a way to decompose a matrix.

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