Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session Q31: Boundary Layer Flows over Rough Surfaces III
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B403
Chair: Michael Schultz, US Naval Academy
Abstract ID: BAPS.2018.DFD.Q31.1
Abstract: Q31.00001 : Receptivity analysis of flows over structured corrugated surfaces
12:50 PM–1:03 PM
Presenter:
Mihailo R Jovanovic
(Univ of Southern California)
Authors:
Mihailo R Jovanovic
(Univ of Southern California)
Wei Ran
(Univ of Southern California)
Armin Zare
(Univ of Southern California)
We develop a model-based approach to quantify the receptivity of laminar and turbulent channel flows over corrugated surfaces. For small-amplitude roughness elements, we utilize perturbation analysis to determine the modification to the mean flow. The dynamics of velocity fluctuations around the resulting base velocity profile are studied using the linearized Navier-Stokes equations. In turbulent regime, the effect of background turbulence on the mean velocity is captured by a turbulent viscosity which can be determined from second-order statistics of velocity fluctuations. We utilize the second-order statistics resulting from the stochastically forced linearized model to compute a correction to the turbulent viscosity. This correction in turn influences the turbulent mean velocity and modifies skin-friction drag. Our simulation-free approach paves the way for a systematic analysis of energy amplification and skin-friction drag in the presence of roughness elements of various height and spacing.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q31.1
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