Detailed analysis of POD method applied on turbulent ﬂow
Institute of Thermomechanics, Department of Meteorology and Environment Protection, Charles University,
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2 Institute of Thermomechanics
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Proper orthogonal decomposition (POD) of a very turbulent ﬂow inside a street canyon is performed. The energy contribution of each mode is obtained. Also, physical meaning of the POD result is clariﬁed. Particular modes of POD are assigned to the particular ﬂow events like a sweep event, a vortex behind a roof or a vortex at the bottom of a street. Test of POD sensitivity to the acquisition time of data records is done. Test with decreasing sample frequency is also executed. Further, interpolation of POD expansion coefﬁcient is performed in order to test possible increase in sample frequency and get new information about the ﬂow from the POD analysis. We tested a linear and a spline type of the interpolation and the linear one carried out a slightly better result.
© Owned by the authors, published by EDP Sciences, 2012