Heat-transfer analysis of a transitional boundary layer over a concave surface with Görtler vortices by means of direct numerical simulations

M Méndez, MS Shadloo, A Hadjadj - Physics of Fluids, 2020 - pubs.aip.org
This work studies the development of a thermal boundary layer during the laminar-to-
turbulent transition process over a concave surface. Direct numerical simulations are …

Heat transfer analysis in a flow over concave wall with primary and secondary instabilities

V Malatesta, LF Souza, JTC Liu, MJ Kloker - Procedia IUTAM, 2015 - Elsevier
The centrifugal instability mechanism in boundary layers over concave surfaces is
responsible for the development of counter-rotating vortices, aligned in the streamwise …

Linear to turbulent Görtler instability transition

J Dagaut, ME Negretti, G Balarac, C Brun - Physics of Fluids, 2021 - pubs.aip.org
We present results from a highly resolved large-eddy simulation of a freely developing
Blasius profile over a concave boundary in a large spanwise domain. Due to the large initial …

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

JK Rogenski, LF De Souza, JM Floryan - Physics of Fluids, 2016 - pubs.aip.org
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 Görtler vortices …

On the odd and even secondary instabilities of Görtler vortices

LF Souza - Theoretical and Computational Fluid Dynamics, 2017 - Springer
Boundary layer flows over concave wall can be unstable to disturbances giving rise to
streamwise counter-rotating vortices known as Görtler vortices. These vortices in its …

Influence of pressure gradients on the evolution of the Görtler instability

JK Rogenski, LF De Souza, JM Floryan - AIAA Journal, 2016 - arc.aiaa.org
THE influence of geometry on the stability of boundary layers is of interest in many
aerospace applications, and its proper selection may lead to drag reduction and increase of …

Heat transfer enhancement via Görtler flow with spatial numerical simulation

V Malatesta, JK Rogenski, LF Souza - … Methods for Heat & Fluid Flow, 2017 - emerald.com
Purpose The centrifugal instability mechanism of boundary layers over concave surfaces is
responsible for the development of quasi-periodic, counter-rotating vortices aligned in a …

Nonlinear hydrodynamic and thermodynamic aspects of unsteady Görtler flows

AS Takata, JK Rogenski, LF de Souza - International Journal of Thermal …, 2023 - Elsevier
Both steady and unsteady Görtler vortices may lead to an incompressible boundary layer
flow to transition from laminar to turbulent flow. Görtler structures can modify hydrodynamic …

Effects of streamwise wall curvature variation on the nonlinear evolution of different Görtler vortices wavelengths

LF Marques, JK Rogenski, LF de Souza - Journal of the Brazilian Society …, 2020 - Springer
In this paper, a high-order, pseudo-spectral numerical code (HOPe) is used to investigate
the influence of curvature variations on the nonlinear evolution of different Görtler vortices …

Numerical simulations of boundary layer transition over a concave surface: application to the design of Savonius-style vertical axis wind turbines

MG Méndez - 2020 - theses.hal.science
The results presented in this chapter were published in the scientific journal Computers and
Fluids (Méndez et al. 2018). The article cover is presented in the following page. In this …