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On the curvature/buoyancy analogy for turbulent shear flows

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Abstract

Similarity in the near wall region of turbulent curved shear flows is examined. It is found that the normalized mean velocity is a function only of the dimensionless distance ζ c =z/L c whereL c is a corresponding Monin-Oboukhov length for curved shear flows. Again, the universal function is found to obey the log-linear law. Therefore, this result and the earlier derivation of So affirm that there is a very close analogy between the effects of streamline curvature and buoyancy for turbulent shear flows.

Zusammenfassung

Die Ähnlichkeitsverhältnisse in turbulenten, gekrümmten Strömungen mit Schubkräften wird für das Gebiet in der Nähe einer Wand untersucht. Es ergibt sich, daß die normalisierte mittlere Geschwindigkeit nur von der dimensionslosen Entfernung ζ c =z/L c abhängt.L c ist hierbei eine zugeordnete Monin-Oboukhov-Länge für gekrümmte Strömungen mit Schubkräften. Auch in diesem Falle geohorcht die allgemeine Gleichung dem logarithmisch-linearen Gesetz. Dieses Ergebnis und die frühere Ableitung von So bestätigen, daß eine ausgeprägte Analogie zwischen den Auswirkungen der Strömungslinienkrümmung und dem Auftrieb bei turbulenten Strömungen mit Schubkräften besteht.

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So, R.M.C. On the curvature/buoyancy analogy for turbulent shear flows. Journal of Applied Mathematics and Physics (ZAMP) 31, 628–633 (1980). https://doi.org/10.1007/BF01596162

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  • DOI: https://doi.org/10.1007/BF01596162

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