MODELLING OF INTERACTIONS AND TRANSFERS IN PASSIVE WARM CLOUDS. PART II: NUMERICAL SIMULATIONS AND ANALYSIS OF THE EVOLUTION OF THE COUPLE WATER VAPOUR-DROPLETS IN SOME CONDITIONS OF ENTRAINMENT OF THE SURROUNDING AIR

Roger N’Dri Djue (Côte d’Ivoire), Emile Danho (Côte d’Ivoire), Moustapha Karam Sangare (Côte d’Ivoire), Bakary Coulibaly (Côte d’Ivoire) and Kouassi Kouassi Serge Yanga (Côte d’Ivoire)

Received December 10, 2007

Abstract

In [2], we have established a model to analyse the evolution of passive warm clouds which can be assimilated to a small cumulus. The purpose of this present paper is to resolve numerically the model of passive warm clouds evolution obtained in [2] and also to analyse the evolution of the couple water vapour-droplets in some conditions of entrainment of the surrounding air. After some simulations, it appears that the model is adapted to reproduce the behaviour of the passive warm clouds and is an interesting tool in assessing passive warm clouds internal parameters.

Keywords and phrases: clouds, droplets, microphysics, dynamics, thermodynamics, mixing ratio.