Non-linear aspects of Gortler instability in boundary layers with pressure gradient

Author(s)

Rogenski, J. K. ; de Souza, L. F. ; Floryan, J. M.

• Document type: Journal article
• Source: Physics of Fluids; v. 28, n. 12 DEC 2016.
• Web of Science Citations: 5

Abstract

The laminar flow over a concave surface may undergo transition to a turbulent state driven by secondary instabilities initiated by the longitudinal vortices known as Gortler vortices. These vortices distort the boundary layer structure by modifying the streamwise velocity component in both spanwise and wall-normal directions. Numerical simulations have been conducted to identify the role of the external pressure gradients in the development and saturation of the vortices. The results show that flows with adverse pressure gradients reach saturation upstream from the saturation location for neutral and favorable pressure gradients. In the transition region, the mean spanwise shear stress is about three times larger than in the flow without the vortices. Published by AIP Publishing. (AU)

• FAPESP's process: 11/08010-0 - Pressure gradient influence in transition flows over concave walls
• Grantee: Josuel Kruppa Rogenski
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/00553-0 - Pressure gradient influence in transition flows over concave walls
• Grantee: Josuel Kruppa Rogenski
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate