The paper reports on DNS and LES of plane channel flow at Reτ = 180 and compares these to a DNS with a higher order convection scheme. For LES different subgrid-scale models like the Smagorinsky, the Dynamic Smagorinsky and the Dynamic Mixed Model were used with the grid being locally refined in the near-wall region. The mixing of a passive scalar has been simulated with two convection schemes,...

Qualitative comparison between observed and simulated fields over the Labrador Sea is performed. The model simulates the observed mean horizontal circulations of the surface cyclonic subpolar gyre and the mid-depth (~ 700 m) cyclonic recirculations. The distribution of the eddy kinetic energy shows good agreement with the observed evidence over the surface in annual average. The model captures ...

A systematic study of large-scale velocity structures in turbulent thermal convection is carried out in three different aspect-ratio cells filled with water. Laser Doppler velocimetry is used to measure the velocity profiles and statistics over varying Rayleigh numbers Ra and at various spatial positions across the whole convection cell. Large velocity fluctuations are found both in the central...