混合層中での乱流およびスカラ拡散に及ぼす粒子の効果(流体工学,流体機械)

概要

論文の詳細を見る
A direct numerical simulation (DNS) based on a finite volume method is applied to a particle-laden turbulent mixing layer in order to examine effects of loaded particles on turbulence and scalar diffusion. Trajectories of all particles are individually pursued with a Lagrangian method. The results show that the small particles, whose response time, τ_p, is smaller than the Kolmogorov time scale, τ_k, reduce the turbulent intensities of streamwise and transverse velocity fluctuations upstream of the mixing layer. However, the streamwise slope of turbulent intensities becomes high as compared to particle-free flow downstream of the mixing layer. Because source terms, which are energy exchange and turbulent production terms for the turbulent intensity of streamwise velocity fluctuation and pressure strain correlation term for that of transverse velocity fluctuation, are increased. Furthermore, the small particles increase the mean squared values of the concentration fluctuations.
社団法人日本機械学会の論文
2003-12-25