A NEW POINT OF VIEW ON SKIN-FRICTION CONTRIBUTIONS IN ADVERSE-PRESSURE-GRADIENT TURBULENT BOUNDARY LAYERS
Atzori M, Stroh A, Gatti D, Fukagata K, Vinuesa R, Schlatter P (2022)
Publication Type: Conference contribution
Publication year: 2022
Publisher: International Symposium on Turbulence and Shear Flow Phenomena, TSFP
Conference Proceedings Title: 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022
Event location: Osaka, Virtual, JPN
Abstract
Skin-friction decompositions such as the so-called FIK identity (Fukagata et al., 2002) are useful tools in identifying relevant contributions to the friction, but may also lead to results difficult to interpret when the total friction is recovered from cancellation of multiple terms with large values. We propose a new formulation of the FIK contributions related to streamwise inhomogeneity, which is derived from the convective form of the momentum equation and using the concept of dynamic pressure. We examine turbulent boundary layers subjected to various pressure-gradient conditions, including cases with drag-reducing control. The new formulation distinguishes more precisely the roles of the free-stream pressure distribution, wall-normal convection, and turbulent fluctuations. Our results allow to identify different regimes in adverse-pressure-gradient turbulent boundary layers, corresponding to different proportions of the various contributions, and suggest a possible direction towards studying the onset of mean separation.
Authors with CRIS profile
Involved external institutions
Karlsruhe Institute of Technology (KIT)
Germany (DE)
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
Johannes Kepler Universität (JKU) Linz
Austria (AT)
Keio University
Japan (JP)
Germany (DE)
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
Johannes Kepler Universität (JKU) Linz
Austria (AT)
Keio University
Japan (JP)
How to cite
APA:
Atzori, M., Stroh, A., Gatti, D., Fukagata, K., Vinuesa, R., & Schlatter, P. (2022). A NEW POINT OF VIEW ON SKIN-FRICTION CONTRIBUTIONS IN ADVERSE-PRESSURE-GRADIENT TURBULENT BOUNDARY LAYERS. In 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022. Osaka, Virtual, JPN: International Symposium on Turbulence and Shear Flow Phenomena, TSFP.
MLA:
Atzori, Marco, et al. "A NEW POINT OF VIEW ON SKIN-FRICTION CONTRIBUTIONS IN ADVERSE-PRESSURE-GRADIENT TURBULENT BOUNDARY LAYERS." Proceedings of the 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022, Osaka, Virtual, JPN International Symposium on Turbulence and Shear Flow Phenomena, TSFP, 2022.
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