Direct Numerical Simulation of the turbulent wake behind a heated cylinder

作者：Boirlaud M^*; Couton D; Plourde F

来源：International Journal of Heat and Fluid Flow, 2012, 38: 82-93.

DOI：10.1016/j.ijheatfluidflow.2012.09.005

• DNS
• Turbulence
• Buoyancy
• Mixed convection
• Vortex

Direct Numerical Simulations were conducted to describe a well-known and widely studied configuration, i.e. flow field development downstream from a cylinder under the mixed convection regime, which has too rarely been considered. The Richardson number studied was equal to 2.77 and the Reynolds number equal to 1000; under such conditions, thermal instability development along the cylinder was found to interact with and pronouncedly disturb upper shear-layer development. Whole flow behavior in the back of the cylinder is consequently asymmetric. The resulting flow corresponds to complex features ranging from Kelvin-Helmholtz instabilities to pure buoyant diffusion process and Von Karman alley, the latter being significantly deviated upward.

• 出版日期2012-12