均一な平均せん断流中の点源プルームによる物質拡散場の条件付統計量の特性について

概要

論文の詳細を見る
Various conditional statistics have been examined on a turbulent diffusion of dye solution from a continuous point source in uniform mean vertical shear flow. The conditional sampling technique consists of two steps, i.e. the first step A which determines the intermittency factor from the probability density function and the second step B at which is obtained the intermittency function by using a threshold level and a hold time. It is shown that the vertical profiles of the intermittency factor, the zone-averaged mean concentration and the zone-averaged concentration fluctuation r.m.s. value are all asymmetric about the centerline of plume. The new dimensionless diffusion time η is introduced in terms of the r.m.s. value and the integral length scale of longitudinal velocity fluctuation, and the relative decay rates with η of these conditional statistics on center line of plume are estimated and compared with the results in grid-generated turbulent flow.
一般社団法人日本機械学会の論文
1988-02-25