Complexity and Creation on a Karman Vortex Street as Thermo-Fluid Dynamics

发现热流体动力学下卡门涡街的复杂性和生成：(1)低雷诺数下卡门涡街的复杂性和生成是尾迹上增加负浮力而产生的，其行为与流体类型有关。(2) 45[小于或等于]Re （Re为雷诺数）尾迹的复杂性和创造是卡门涡街受正浮力抑制，负浮力发展。抑制和发育的行为取决于流体类型。(3)尾迹振荡的复杂性和产生是，随着Ri的增加，其中Ri为Richardson数，在一定的Ri数下，Strouhal数突然减小。(4)尾流涡度的复杂性和产生是尾流涡度因正浮力而减小，由负浮力产生。尾流涡度随浮力的变化是复杂和创造的主要原因。

Complexity and creation on a Karman vortex street as thermo-fluid dynamics is discovered as follows :(1) Complexity and creation at low Reynolds numbers is that a Karman vortex street occurs by adding negative buoyancy on a wake, and its behavior depends on fluid type.(2) Complexity and creation in the wake at 45【less than or equal】Re, where Re is the Reynolds number, is that the Karman vortex street is suppressed by positive buoyancy and develops by negative buoyancy. Behavior of the suppression and development depend on fluid type.(3) Complexity and creation on the wake oscillation is that, with an increase of Ri, where Ri is the Richardson number, the Strouhal number decreases abruptly at a certain Ri number.(4) Complexity and creation on the wake vorticity is that the wake vorticity decreases due to positive buoyancy, and is generated by negative buoyancy. The chage of the wake vorticity by buoyancy is a main cause of complexity and creation.