| Автор | Reynolds, A M |
| Дата выпуска | 1997-05-31 |
| dc.description | A Lagrangian stochastic model, a generalization of the Langevin equation to inhomogeneous flows, is developed for the simulation of particle trajectories within inhomogeneous turbulent flows. For homogeneous flows the model yields a Gaussian distribution of velocity and is exactly consistent with Thomson's well-mixed condition. For inhomogeneous flows: the model takes explicit account of the non-Gaussian distribution of velocity; Thomson's well-mixed condition is satisfied approximately to second order; whilst third- and higher-order moments of the velocity distribution are determined by the modelled dynamics. The model is shown to predict mean particle concentrations within a three-dimensional inhomogeneous turbulent flow (a ventilating air flow) in accord with experimental findings. These predictions are contrasted with those obtained using Thomson's model which exactly satisfies the well-mixed condition for inhomogeneous Gaussian turbulence. The results support the view that third- and higher-order moments of velocity are of secondary importance in determining particle dispersion in highly inhomogeneous turbulent flows when compared to the effects of strong mean-streamline straining and large gradients in Reynolds-stress. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Копирайт | © 1997 The Japan Society of Fluid Mechanics and IOP Publishing Ltd |
| Название | A Lagrangian stochastic model for particle trajectories in non-Gaussian turbulent flows |
| Тип | paper |
| DOI | 10.1016/S0169-5983(96)00050-0 |
| Electronic ISSN | 1873-7005 |
| Print ISSN | 0169-5983 |
| Журнал | Fluid Dynamics Research |
| Том | 19 |
| Первая страница | 277 |
| Последняя страница | 288 |
| Аффилиация | Reynolds, A M; Silsoe Research Institute, Wrest Park, Silsoe, Bedford MK45 4HS, UK |
| Выпуск | 5 |
