Simulations of drop fall in a homogeneous isotropic turbulent flow

摘要: Abstract Drop motion in a turbulent flow is studied using model of homogeneous and isotropic turbulence. The permits us to generate different realizations the random velocity field component with given latitudinal lateral correlation functions spatial structure which obeys Kolmogorov theory. For generation flow, function form suggested by Batchelor was chosen. This describes spectrum turbulence both viscous inertial subranges. Numerous examples drop tracks for drops size demonstrate significant influence on aspects (as well as ice aerosol particle) motion. tendency collect along isolated paths demonstrated. existence areas two types within revealed. Drops (aerosol particles) tend leave enhanced vorticity curvature apparently due their inertia. At same time, “avoid” these areas. Interlacing small attributed deviations from difference inertia formation turbulence-induced air Some statistical characteristics movement are Monte Carlo method. analysis spectra relative fluctuations reveals pronounced maximum at frequencies depending size. horizontal deviation moves highest frequency 20 Hz 10 μm about 0.1 500 drop. To evaluate contribution (inertia) effects compared effect gravity, ratio root-mean-square (induced turbulence) still-air terminal calculated wide sizes. reaches its smallest drops. Inertial acceleration seems be main factor leading velocity. value case considered greater than 7 g. Possible broadening warm rain formation, concentration inhomogeneity clouds, time space precipitation rate, in-cloud scavenging mechanisms enhancement under cloud seeding discussed.