This paper deals with the numerical simulation of incompressible turbulent boundary flow of a flat plate with the pseudo-spectral matrix method. In order to appear more than 10 nodes in the turbulent base-stratum and ...This paper deals with the numerical simulation of incompressible turbulent boundary flow of a flat plate with the pseudo-spectral matrix method. In order to appear more than 10 nodes in the turbulent base-stratum and transition of 43×43 computational grids,a coordinate transformation is put up from physical panel to computational panel. Several zero turbulent models are computed comparatively. The results are credible when comparing with the previous methods.展开更多
Evolution of vortex structures in round jet was simulated with a three-dimensional discrete vortex filament method. The motion of the particles was described by a Lagrangian equation and the counteraction of particles...Evolution of vortex structures in round jet was simulated with a three-dimensional discrete vortex filament method. The motion of the particles was described by a Lagrangian equation and the counteraction of particles on the flow was taken into account by using a modified velocity model. It is indicated that in two-phase jet flow the introduced particles restrain the crosswise dispersion of jet shear layer and mergence of vortex structures. With the increase of St number, the influence of flow on particles motion is decreased, but the counteraction of particles on the flow is increased. The difference of flow field obtained with two models, one-way coupling model and two-way coupling model, is greater than that of particles trajectories.展开更多
Based on P. Y. Chou's theory of turbulence for incompressible viscous fluids, this paper solves the Reynolds' equations of mean motion and the equations of turbulent fluctuation simultaneously using the method...Based on P. Y. Chou's theory of turbulence for incompressible viscous fluids, this paper solves the Reynolds' equations of mean motion and the equations of turbulent fluctuation simultaneously using the method of successive substitution. The comparison of the computed results for incompressible plane turbulent jet with the experimental data is reasonably good.展开更多
文摘This paper deals with the numerical simulation of incompressible turbulent boundary flow of a flat plate with the pseudo-spectral matrix method. In order to appear more than 10 nodes in the turbulent base-stratum and transition of 43×43 computational grids,a coordinate transformation is put up from physical panel to computational panel. Several zero turbulent models are computed comparatively. The results are credible when comparing with the previous methods.
文摘Evolution of vortex structures in round jet was simulated with a three-dimensional discrete vortex filament method. The motion of the particles was described by a Lagrangian equation and the counteraction of particles on the flow was taken into account by using a modified velocity model. It is indicated that in two-phase jet flow the introduced particles restrain the crosswise dispersion of jet shear layer and mergence of vortex structures. With the increase of St number, the influence of flow on particles motion is decreased, but the counteraction of particles on the flow is increased. The difference of flow field obtained with two models, one-way coupling model and two-way coupling model, is greater than that of particles trajectories.
文摘Based on P. Y. Chou's theory of turbulence for incompressible viscous fluids, this paper solves the Reynolds' equations of mean motion and the equations of turbulent fluctuation simultaneously using the method of successive substitution. The comparison of the computed results for incompressible plane turbulent jet with the experimental data is reasonably good.
