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您的检索式：关键字=vortical structures
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| 1 | Vortical structures and wakes of a sphere in homogeneous and density stratified fluid显示文摘Vortical structures and wakes of bluff bodies in homogenous and stratified environment are common and important in ocean engineering.Based on the Boussinesq approximation,a thermocline model is proposed to deal with the variable density stratified fluid,and implemented in the commercial software Simcenter STAR-CCM+framework.The improved delayed detached eddy simulation(IDDES)modeling method is adopted to resolve the coherent vortical structures and turbulent wakes precisely and efficiently.Four conditions consisting of one homogenous and three stratified fluid cases with different density gradient past a sphere at Reynolds number 3700 are investigated.Results show that density stratification has a great impact on the vortical structures,the vertical motion is suppressed and internal waves will be induced and propagated,which is very different with that of homogenous situation.With the stratification strength increases,the vortical structures are gradually flattened,the asymmetry and anisotropy between vertical and horizontal motions are enhanced. | Liu-shuai Cao Feng-lai Huang Cheng Liu De-cheng Wan | 2021 | Journal of Hydrodynamics2021，33，2： | 6 |
| 2 | Key structure in laminar-turbulent transition of boundary layer with streaky structures显示文摘A numerical simulation is performed to find out a key vortical structure in the laminar-turbulent transition. A low-speed streak is generated inside a laminar boundary layer using an isolated cuboid roughness, aimed at providing an environment unstable to outer disturbances. Then, a short duration jet is issued into the boundary layer. When the jet velocity is low, some vortices appear in the boundary layer, but the transition of the boundary layer does not take place.However, when the jet velocity exceeds a certain threshold, two vortices newly appear above the elongated legs of a V-shaped vortex and only one of them is stretched and survives. After that,vortices are generated one after another around the survived one. By comparing the decayed and the survived vortices, it is found that the difference in their heights is the key characteristic which leads to the transition. | Joe Yoshikawa Yu Nishio Seiichiro Izawa Yu Fukunishi | 2019 | Theoretical & Applied Mechanics Letters2019，9，1： | 0 |
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