摘要
本文采用非线性稳定性分析方法,研究了湍流边界层底层相干结干结构的成因.计算得到的增长最快的不稳定波的展向尺度与纵向尺度都与实验相符.这一分析的特点是采用了不同于湍流平均速度剖面的更合理的速度剖面作为稳定性分析的基础,并采用了新的非线性理论.文中结果有助于理解湍流边界层底层相干结构的拟有序现象.
In this paper, the formation of the coherent structure in Iht wall region of a turbulent boundary layer was studied, using the nonlinear theory of the hydro-dynamic instability. The span-wise wavelength and the, stream-wise wavebngth of the most quickly amplified instability wav;, obtained by th;' calculation arc in good agreement with i.he experiment, which makes the distinction of the calculation in this jjaper as tho basis of the instability analysis, the more- rational velocity profile -was used, which is different from that of the turbulent mean flow and the new nonlinear theory was used. The result may be usoful in understanding the quasi-ordering phenomena of the coherent structure in thi turbulent boundary layer.
出处
《应用数学和力学》
CSCD
北大核心
1993年第11期939-947,共9页
Applied Mathematics and Mechanics
基金
国家自然科学基金
教委优秀青年教师基金资助项目
关键词
相干结构
幅值演化
湍流
边界层
coherent structure, resonant tried amplitude evolution
