首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  免费   3篇
  国内免费   1篇
物理学   4篇
  2018年   2篇
  2015年   1篇
  2014年   1篇
排序方式: 共有4条查询结果,搜索用时 15 毫秒
1
1.
Using the method of the parameter expansion up to the third order, explicitly investigates surface tension effect on harmonics at weakly nonlinear stage in Rayleigh-Taylor instability (RTI) for arbitrary Atwood numbers and compares the results with those of classical RTI within the framework of the third-order weakly nonlinear theory. It is found that surface tension strongly reduces the linear growth rate of time, resulting in mild growth of the amplitude of the fundamental mode, and changes amplitudes of the second and third harmonics, as is expressed as a tension factor coupling in amplitudes of the harmonics. On the one hand, surface tension can either decrease or increase the space amplitude; on the other hand, surface tension can also change their phases for some conditions which are explicitly determined.  相似文献   
2.
The nonlinear saturation amplitude (NSA) of the fundamental mode in the classical Rayleigh-Taylor instability with a cylindrical geometry for an arbitrary Atwood number is analytically investigated by considering the nonlinear corrections up to the third order. The analytic results indicate that the effects of the initial radius of the interface (r0) and the Atwood number (A) play an important role in the NSA of the fundamental mode. The NSA of the fundamental mode first increases gently and then decreases quickly with increasing A. For a given A, the smaller the ro/λ(λ is the perturbation wavelength), the larger the NSA of the fundamental mode. When ro/λ is large enough (r0 〉〉 λ), the NSA of the fundamental mode is reduced to the prediction in the previous literatures within the framework of the third-order perturbation theory.  相似文献   
3.
为了更好地理解不同空间坐标系下流体界面对Rayleigh-Taylor(RT)不稳定性弱非线性阶段谐波的影响,文章采用3阶小扰动展开法,解析研究了球坐标空间经典RT不稳定性弱非线性阶段谐波的演化规律,并和柱坐标空间以及直角坐标空间相应结果进行了对比研究.当球坐标系和直角坐标系中RT不稳定性界面扰动波长相同,球坐标系中初始扰动半径为无穷大时(即球坐标下RT不稳定性初始扰动半径相对于扰动波长为无穷大时),球坐标下RT不稳定性前4次谐波的结果和直角坐标系下的相应结果相同.研究表明:由初始界面曲率引起的Bell-Plesset(BP)效应和空间效应(直角坐标空间、柱坐标空间和球坐标空间)对谐波发展有较大的影响.即在不同正交曲线坐标系下,不同曲率的流体界面效应对RT不稳定性谐波发展有较大的影响.对于柱坐标空间和球坐标空间,2阶对0次谐波的反馈加强了界面向内收缩.研究还表明:界面效应增加了2次谐波的负反馈,然而,对于基模和3次谐波却有不同的影响.   相似文献   
4.
刘万海  马文芳  王绪林 《中国物理 B》2015,24(1):15202-015202
The classical Rayleigh–Taylor instability(RTI)at the interface between two variable density fluids in the cylindrical geometry is explicitly investigated by the formal perturbation method up to the second order.Two styles of RTI,convergent(i.e.,gravity pointing inward)and divergent(i.e.,gravity pointing outwards)configurations,compared with RTI in Cartesian geometry,are taken into account.Our explicit results show that the interface function in the cylindrical geometry consists of two parts:oscillatory part similar to the result of the Cartesian geometry,and non-oscillatory one contributing nothing to the result of the Cartesian geometry.The velocity resulting only from the non-oscillatory term is followed with interest in this paper.It is found that both the convergent and the divergent configurations have the same zeroth-order velocity,whose magnitude increases with the Atwood number,while decreases with the initial radius of the interface or mode number.The occurrence of non-oscillation terms is an essential character of the RTI in the cylindrical geometry different from Cartesian one.  相似文献   
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号