Investigation of the energy carrying outer layer structures in adverse pressure gradient flows

Taygun Recep Gungor, Ayse Gul Gungor, Yvan Maciel, Mark Phil Simens

Research output: Contribution to conferencePaperpeer-review

Abstract

Spatio-temporal energy spectra are analyzed from a direct numerical simulation of a non-equilibrium adverse pressure gradient (APG) turbulent boundary layer (TBL) spanning Reθ =1500-8200 and shape factor H = 1.4 − 3. The temporal data at two streamwise positions corresponding to small (H = 1.6) and large (H = 2.5) velocity defects are used to obtain the spatio-temporal spectra. The increase in the mean velocity defect has several effects on the energy carrying outer layer structures. The turbulent activity in the inner layer is attenuated. The energy moves away from the wall to the outer layer. The streamwise and spanwise wavelengths of the energy carrying outer layer structures decrease with increasing velocity defect.

Original languageEnglish
Publication statusPublished - 2019
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: 30 Jul 20192 Aug 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
Country/TerritoryUnited Kingdom
CitySouthampton
Period30/07/192/08/19

Bibliographical note

Publisher Copyright:
© 2019 International Symposium on Turbulence and Shear Flow Phenomena, TSFP. All rights reserved.

Funding

A.G.G. and T.R.G were supported by Research Fund of the Istanbul Technical University with the project number of MGA-2017-40731. T.R.G and Y.M are supported by NSERC of Canada. Computations of the present data was made possible by a generous grant of computer time from Compute Canada.

FundersFunder number
NSERC of Canada
Compute Canada
Natural Sciences and Engineering Research Council of Canada
Istanbul Teknik ÜniversitesiMGA-2017-40731

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