Large-eddy simulations of a separation/reattachment bubble in a turbulent-boundary-layer subjected to a prescribed upper-boundary, vertical-velocity profile

Wan Cheng, D. I. Pullin, Ravindra Samtaney

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We describe large-eddy simulations of turbulent boundary-layer flow over a flat plate at high Reynolds number in the presence of an unsteady, three-dimensional flow separation/reattachment bubble. The stretched-vortex subgrid-scale model is used in the main flow domain combined with a wall-model that is a two-dimensional extension of that developed by Chung & Pullin (2009). Flow separation and re-attachment of the incoming boundary layer is induced by prescribing wall-normal velocity distribution on the upper boundary of the flow domain that produces an adverse-favorable stream-wise pressure distribution at the wall. The LES predicts the distribution of mean shear stress along the wall including the interior of the separation bubble. Several properties of the separation/reattachment flow are discussed.

Original languageEnglish (US)
Title of host publicationProceedings of Ninth International Symposium on Turbulence and Shear Flow Phenomena (TSFP-9)
StatePublished - Jan 1 2015

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