Abstract
A second moment closure model is used to study the mean fields and turbulence structure of spanwise rotating flows and flows with streamline curvature. The effects of flow stabilization and destabilization by rotation and/or curvature and their interpretation in terms of a Rayleigh instability mechanism are discussed in the context of the present model. When applied to the constant flux layer adjacent to a bounding surface, the model provides a similarity theory for flows with spanwise rotation and streamline curvature like that of Monin-Obukhov in the case of density stratified flows. In particular, it is shown that Bradshaw's empirical length scale correction can be derived in terms of the basic constants of the model determined in the absence of rotation and curvature. Also, direct comparisons with experimental data confirm the model predictions. The definitions of strong and mild curvature are discussed and a distinguishing criterion derived.
Zusammenfassung
Gemittelte Strömungsfelder und Turbulenzcharakteristiken werden bestimmt mittels eines numerischen Modelles mit Momenten zweiter Ordnung als Ciosure für lateral rotierende Strömungen und mit gekrümmten Stromlinien. Stabilisierungs- und Destabilisierungseffekte infolge Rotation und/oder Krümmung werden als Raleigh-Instabilitäten im Zusammenhang mit dem Modell diskutiert. Wenn angewandt auf die Konstant-Scherspannungszone in Grenzschichten, liefert das Modell eine Ähnlichkeitstheorie für Strömungen mit lateraler Rotation und Stromlinienkrümmung, vergleichbar dem Falle des Monin-Obukhov Modelles für geschichtete Strömungen. Es wird insbesondere gezeigt, dass Bradshaws empirische Längenkorrektur sich aus den Grundkonstanten des Modelles ergibt für den Grenzfall ohne Rotation und Krümmung. Direkter Vergleich mit experimentellen Daten bestätigt die Rechnungen. Die Definitionen von starker und schwacher Krümmung werden diskutiert und ein Unterscheidungskriterium eingeführt.
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Galperin, B., Mellor, G.L. The effects of streamline curvature and spanwise rotation on near-surface, turbulent boundary layers. Z. angew. Math. Phys. 42, 565–583 (1991). https://doi.org/10.1007/BF00946177
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DOI: https://doi.org/10.1007/BF00946177