Conference Proceedings

Secondary flow over surfaces with spanwise heterogeneity

DD Wangsawijaya, CM de Silva, R Baidya, D Chung, I Marusic, N Hutchins

Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018 | Published : 2018

Abstract

© 2018 Australasian Fluid Mechanics Society. All rights reserved. Surfaces with heterogeneous roughness are known to alter the behaviour of canonical turbulent boundary layers. In the case where roughness varies in the spanwise direction, the turbulent boundary layer is modified by secondary flows in the form of counter-rotating streamwise roll modes. Previous studies on various spanwise heterogeneity models have shown that the behaviour of these secondary flows is determined by the type, spacing, and the width of the roughness elements. To examine this further, we here conduct a series of hot-wire anemometry measurements over surfaces with strips of spanwise heterogeneous roughness, where t..

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