Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J43: Turbulence: Modeling II
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 207B
Chair: Dhawal Buaria, New York University
Abstract: J43.00005 : Compressed representations and reduced order modeling of the turbulent flow response to roughness*
5:27 PM–5:40 PM
Presenter:
Miles J Chan
(Caltech)
Authors:
Miles J Chan
(Caltech)
Ugo Piomelli
(Queen's University)
Beverley J McKeon
(Stanford University)
In this work, a resolvent framework for forming compressed representations and reduced order models of the turbulent flow response to generalized roughness, without a-priori knowledge of the rough wall mean flow, is developed and applied in the case of a channel flow over sandgrain roughness. This framework is used to generate reduced representations which reproduce the wakefield fluctuations and dispersive stresses using less than 0.01% of the original degrees of freedom. Furthermore, using trends identified in data, this framework is used to form a predictive model for the dispersive stresses. The theoretical application of compressed representations and dispersive stress modeling to predicting global flow quantities is presented.
*The support of AFOSR under grant FA9550-21-1-0443 is gratefully acknowledged.
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