Study on the analogy between velocity and temperature fluctuations in the turbulent rotating channel flows

Abstract

Turbulent rotating channel flow is of great interest in engineering practice, such as the cooling of the blades in turbo machinery. This paper investigates the turbulence characteristics of temperature fluctuations in rotating turbulent channel flow by direct numerical simulation. It is known that the analogy exists between temperature and velocity fluctuations in non-rotating channel flows. In this paper the analogous property is investigated between temperature and streamwise velocity fluctuations in rotating turbulent channel flows and it has been found that the analogy exists at pressures side in near wall region but the analogy is violated at the suction wall. The influence of the large scale flow structure in rotating channel, known as the Taylor-Görtler vortex, on the characteristics of temperature fluctuations are revealed.