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Abstract #2257

On the dynamic range of Reynolds stress tensor quantification

Simon Schmidt1, Kristine John2, Martin Bruschewski2, Sebastian Flassbeck1, Mark E. Ladd1, Sven Grundmann2, and Sebastian Schmitter1,3
1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Institute of Fluid Mechanics, University of Rostock, Rostock, Germany, 3Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany

In this work, we successfully quantified the Reynolds stress tensor (RST) in a well-known fluid-dynamic test case: the flow over periodic hills. This test case was chosen because the turbulence in this kind of flow is strongly inhomogeneous and anisotropic, representing a challenging measurement task. The results indicate, in analogy to intravoxel velocity standard deviation (IVSD) mapping, that RST quantification is highly susceptible to the applied $$$m_1^{enc}~$$$value. Furthermore, RST mapping inherently requires a higher dynamic range compared to IVSD mapping, since the shear stresses are typically much lower than the normal stresses.

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