Turbulent Transport Processes at Rough Surfaces with Geophysical Applications

In this numerical study we use the Lattice Boltzmann Method to investigate the effects of periodic and randomly rough surfaces on the turbulent transport of momentum and heat. A two-dimensional MPI code has been developed and validated against many test cases. We examine in some detail Rayleigh-Benárd convection in the presence of rough walls and study the effects of the wavelength and amplitude of the roughness distribution on the flow.