摘要
突加于流场上的任意扰动可视为有旋畸变与无旋畸变之和.本文探讨了处于均匀切变状态的湍流对突加无旋畸变的响应.研究表明,对突加的无旋畸变,此类湍流的响应极大程度地取决于相对平均切变强度的强弱,且处于强切变状态的湍流对突加畸变的响应要比处于弱切变状态的流动更为敏感.此外,本文还对三种切变状态(强切变、弱切变和中等程度切变)下湍流强度与雷诺应力的响应进行了进一步的研究.
Distortions applied to a turbulent field can be regarded as the combinations of irrotational and rotational distortions. In this paper the response of uniformly shearing turbulence to abruptly applied irrotational distortions is studied. It is found that the response of this turbulence largely depends on the ratio between the magnitude of mean shear and the magnitude of irrotational distortion, i.e., turbulence with weak shear in respect to distortion would respond less sensitively to the applied distortions than turbulence with strong shear. The response of turbulent variances and Reynolds shear stress is studied for three kinds of shear, namely the weak, mild and strong shear.
出处
《水利学报》
EI
CSCD
北大核心
1990年第10期1-7,共7页
Journal of Hydraulic Engineering
