At the same time, detailed experimental studies of turbulent shear flows were being made . 與此同時,湍流切變流的詳細(xì)實(shí)驗(yàn)研究也在進(jìn)行。
An analytical research on evolution of axisymmetric vortex in weakly secondary shear flow 弱二次切變流軸對稱渦旋演變的解析研究
The sliding mode function can be educed by constructing a lyapunov function . and the theory of fuzzy control is used to solve the sliding mode vibration problem 通過構(gòu)造李亞普諾夫函數(shù)得出切變流形函數(shù),得到一種開關(guān)控制,利用模糊控制克服了常規(guī)開關(guān)控制所固有的抖振現(xiàn)象。
If scaling occurs , bio - clean will perform micro - diffusion so that when water enters the pipes , as the turbulent flow of the water funs through the pipe , the fouling on the walls would be removed . 3 當(dāng)管壁已結(jié)垢時, bio - clean會產(chǎn)生微層滲透( microdiffusion ) ,運(yùn)用水流的切變流而將結(jié)垢剝落。
It is showed by numerical calculation that the waves amplify becomes great and the width of waves becomes narrow after the collision or chase of two solitary gravitational waves . the results indicate that the nonlinear interaction between the gravitational waves may be one of the causes for outbreak of severe convective weather . furthermore , by comparing once shear with second shear , we find that it is easier to breaking up or energy dispersion for the solitary gravitational waves by the nonlinear action when the distributing of basic flow is once shear 引入實(shí)際基本氣流,分別討論了具有垂直一次切變和二次切變流時兩個非線性重力波相互作用的數(shù)值計算過程,得到兩個重力波波包相遇或相追都會使波包的振幅增加、波寬變窄;進(jìn)一步分析表明,有高空急流存在的條件下,非線性重力波的相互作用更易使波包破碎、能量頻散,激發(fā)強(qiáng)對流天氣的形成。