The N-S equation in the voticity-stream function form was solved numerically withfinite difference method for flow past two- dimensional cylinder. The generation of symmetricvortex and secondary votex and the evolutio...The N-S equation in the voticity-stream function form was solved numerically withfinite difference method for flow past two- dimensional cylinder. The generation of symmetricvortex and secondary votex and the evolution of Karman vortex street with time progressare numerica1ly simulated in detail. Different velocity types of wake flow are also calculatedand their linear stablity properties are analyzed. Somemethods of controlling wake flow inengineering are introduced according to the theory of absolutely and convectively instablity.展开更多
本文基于AREM（Advanced Regional Eta Model）模式，结合中国气象局成都高原气象研究所西南低涡加密观测科学试验得到的探空观测第一手资料，通过对2012年7月3～4日四川区域性暴雨天气过程（20120703过程）进行数值模拟分析，结果表明...本文基于AREM（Advanced Regional Eta Model）模式，结合中国气象局成都高原气象研究所西南低涡加密观测科学试验得到的探空观测第一手资料，通过对2012年7月3～4日四川区域性暴雨天气过程（20120703过程）进行数值模拟分析，结果表明：（1）降水雨带的分布主要取决于西南低涡移动路径，不同初值会使得低涡路径在磨合协调期产生强摆动，稳定后则在此基础上，随着环境流场继续移动发展。（2）引入4个加密探空站点资料会对整个大气物理量场造成一定影响，最大差值分布在这些站点附近，热力和动力物理量场最大偏差中心并不重合。时间演变直观地说明了初值对局地大气状态的影响时段有限，主要集中在前期，与模式自身调整期相重叠。（3）初始的大气状态必然会随着模式的磨合过程进行调整，不同初值在调整期能对中小尺度低涡系统的位置及强度产生影响，形成各自稳定的低涡系统初态。（4）低涡中心所对应的散度、涡度、垂直速度关系非常密切，但三者强度和发展高度的演变并非完全一致。展开更多
The article hypothesizes that DE and DM (UCM) are a “Form of Motion of a Special Nature”, where “Form of Motion” means “Eternal Motion” as the power of dynamics of different levels and varying degrees of self-su...The article hypothesizes that DE and DM (UCM) are a “Form of Motion of a Special Nature”, where “Form of Motion” means “Eternal Motion” as the power of dynamics of different levels and varying degrees of self-sufficiency, and by “Special Nature”, gravitational and two other properties of matter, “tied” to the “Eternal Movement” and completely dependent on it. Carriers of key properties of a “Special Nature” have been established: “0”-DE particles and “3”-DM particles (UDM). The unity of their inherent “motionally-gravitational” properties and the peculiarity of the relationship between “motion” and “gravity” are revealed: the higher the intensity of “Eternal Motion”, the stronger the gravitational properties of matter are manifested (and vice versa). The relationship of “time” with the “vibration frequency” and the “mass” of photons with the “degree of bonding and deformation properties of the field” is shown. The maximum level of gravity has been determined, which allows Nature to successfully create the Universe: such a landmark is the proximity to the property of the Primary Source—the “pure graviton” of the OSP space, the most powerful “motionally-gravitational” particle of the Universe. The reasons for the emergence of such an identity of the gravitational properties of particles with the indicators of a “pure graviton” are established: for “0”-DE particles, this is the acquisition of the function of “freedom of movement”;for “3”-DM particles (UDM), the creation of a special structure—a “double field” (“Main” and “Small”). The presence in the “double field” of specific “tools” for the creation of the worlds of the Universe—gravitational “waves” gives rise to impulses (shocks) of varying intensity and shape. A list of functions performed by “waves” in the “Main” and “Small” fields has been compiled. The specific conditions for the formation of “UDM Streams”, their transform展开更多
文摘The N-S equation in the voticity-stream function form was solved numerically withfinite difference method for flow past two- dimensional cylinder. The generation of symmetricvortex and secondary votex and the evolution of Karman vortex street with time progressare numerica1ly simulated in detail. Different velocity types of wake flow are also calculatedand their linear stablity properties are analyzed. Somemethods of controlling wake flow inengineering are introduced according to the theory of absolutely and convectively instablity.
文摘本文基于AREM（Advanced Regional Eta Model）模式，结合中国气象局成都高原气象研究所西南低涡加密观测科学试验得到的探空观测第一手资料，通过对2012年7月3～4日四川区域性暴雨天气过程（20120703过程）进行数值模拟分析，结果表明：（1）降水雨带的分布主要取决于西南低涡移动路径，不同初值会使得低涡路径在磨合协调期产生强摆动，稳定后则在此基础上，随着环境流场继续移动发展。（2）引入4个加密探空站点资料会对整个大气物理量场造成一定影响，最大差值分布在这些站点附近，热力和动力物理量场最大偏差中心并不重合。时间演变直观地说明了初值对局地大气状态的影响时段有限，主要集中在前期，与模式自身调整期相重叠。（3）初始的大气状态必然会随着模式的磨合过程进行调整，不同初值在调整期能对中小尺度低涡系统的位置及强度产生影响，形成各自稳定的低涡系统初态。（4）低涡中心所对应的散度、涡度、垂直速度关系非常密切，但三者强度和发展高度的演变并非完全一致。
文摘The article hypothesizes that DE and DM (UCM) are a “Form of Motion of a Special Nature”, where “Form of Motion” means “Eternal Motion” as the power of dynamics of different levels and varying degrees of self-sufficiency, and by “Special Nature”, gravitational and two other properties of matter, “tied” to the “Eternal Movement” and completely dependent on it. Carriers of key properties of a “Special Nature” have been established: “0”-DE particles and “3”-DM particles (UDM). The unity of their inherent “motionally-gravitational” properties and the peculiarity of the relationship between “motion” and “gravity” are revealed: the higher the intensity of “Eternal Motion”, the stronger the gravitational properties of matter are manifested (and vice versa). The relationship of “time” with the “vibration frequency” and the “mass” of photons with the “degree of bonding and deformation properties of the field” is shown. The maximum level of gravity has been determined, which allows Nature to successfully create the Universe: such a landmark is the proximity to the property of the Primary Source—the “pure graviton” of the OSP space, the most powerful “motionally-gravitational” particle of the Universe. The reasons for the emergence of such an identity of the gravitational properties of particles with the indicators of a “pure graviton” are established: for “0”-DE particles, this is the acquisition of the function of “freedom of movement”;for “3”-DM particles (UDM), the creation of a special structure—a “double field” (“Main” and “Small”). The presence in the “double field” of specific “tools” for the creation of the worlds of the Universe—gravitational “waves” gives rise to impulses (shocks) of varying intensity and shape. A list of functions performed by “waves” in the “Main” and “Small” fields has been compiled. The specific conditions for the formation of “UDM Streams”, their transform
