TY  - JOUR
AB  - 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 streamwise direction known as Görtler vortices. By distorting the boundary layer structure in both the spanwise and the wall-normal directions, Görtler vortices may modify heat transfer rates. The purpose of this study is to conduct spatial numerical simulation experiments based on a vorticity–velocity formulation of the incompressible Navier–Stokes system of equations to quantify the role of the transition in the heat transfer process.Design/methodology/approach Experiments are conducted using an in-house, parallel, message-passing code. Compact finite difference approximations and a spectral method are used to approximate spatial derivatives. A fourth-order Runge–Kutta method is adopted for time integration. The Poisson equation is solved using a geometric multigrid method.Findings Results show that the numerical method can capture the physics of transitional flows over concave geometries. They also show that the heat transfer rates in the late stages of the transition may be greater than those for either laminar or turbulent ones.Originality/value The numerical method can be considered as a robust alternative to investigate heat transfer properties in transitional boundary layer flows over concave surfaces.
VL  - 27
IS  - 1
SN  - 0961-5539
DO  - 10.1108/HFF-05-2015-0173
UR  - https://doi.org/10.1108/HFF-05-2015-0173
AU  - Malatesta Vinicius
AU  - Rogenski Josuel Kruppa
AU  - Souza Leandro Franco de
PY  - 2017
Y1  - 2017/01/01
TI  - Heat transfer enhancement via Görtler flow with spatial numerical simulation
T2  - International Journal of Numerical Methods for Heat & Fluid Flow
PB  - Emerald Publishing Limited
SP  - 189
EP  - 209
Y2  - 2024/04/19
ER  -