SPRAY DROPLET MODELING .2. AN INTERACTIVE EULERIAN-LAGRANGIAN MODEL OF EVAPORATING SPRAY DROPLETS

This paper describes an interactive Eulerian-Lagrangian model of the t urbulent transport of evaporating droplets. A k-epsilon (where k is tu rbulent kinetic energy and epsilon is its rate of dissipation) turbule nce closure model is used to accurately simulate stable, near-neutral, and unstable boundary layers within the large air-sea interaction tun nel at the Institut de Mecanique Statistique de la Turbulence (IMST), Luminy, France, These results are then used with the Lagrangian model described in part 1 [Edson and Fairall, 1994]. The coupled model is sh own to give excellent agreement with droplet dispersion measurements m ade during the 1988 Couche Limite Unidimensionelle Stationnaire d'Embr ums (CLUSE, a French acronym that translates to one-dimensional statio nary droplet boundary layer) campaign. Additionally, this paper descri bes how the coupled model can now be used to investigate the interacti on between the evaporating droplets and the turbulent fields of temper ature and humidity. The investigation shows that although the influenc e of the droplets is small under the conditions simulated at IMST, the potential for substantial modification of the surface energy budget e xists for high-wind conditions over the ocean.