On the impact of sea-spray drops on the marine atmospheric boundary layer: a direct numerical simulation study.

摘要: We investigate turbulent exchange processes in a droplet-laden air flow over a waved water surface by performing direct numerical simulation (DNS). Turbulent Couette flow is considered in DNS as a model of a constant-flux layer in the marine atmospheric surface layer. Two-dimensional stationary waves at the water surface are prescribed and assumed to be unaffected by the air-flow and/or droplets. Evaporating droplets of different sizes are injected into the air in the vicinity of wave crests with initial velocities and temperatures of water, and thus mimicking spume sea-spray droplets. Evolution equations of the air-flow velocity, temperature and humidity are solved in a Eulerian framework simultaneously with the equations of individual droplets coordinates and velocities, temperatures and masses tracked in a Lagrangian framework. The momentum (Qm) and sensible (Qs) and latent (QL) heat fluxes from the …