Characteristics of vortex packets in turbulent boundary layers

نویسندگان

  • BHARATHRAM GANAPATHISUBRAMANI
  • ELLEN K. LONGMIRE
  • IVAN MARUSIC
چکیده

BHARATHRAM GANAPATHISUBRAMANI, ELLEN K. LONGMIRE and IVAN MARUSIC Journal of Fluid Mechanics / Volume 478 / March 2003, pp 35 ­ 46 DOI: 10.1017/S0022112002003270, Published online: 17 March 2003 Link to this article: http://journals.cambridge.org/abstract_S0022112002003270 How to cite this article: BHARATHRAM GANAPATHISUBRAMANI, ELLEN K. LONGMIRE and IVAN MARUSIC (2003). Characteristics of vortex packets in turbulent boundary layers. Journal of Fluid Mechanics, 478, pp 35­46 doi:10.1017/S0022112002003270 Request Permissions : Click here

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

DNS Study on the Evolution of Vortical Packets and Their Interactions in Boundary Layer

Vortical structures like the Λ-vortex and ring-like vortex play a critical role in the boundary layer transition process. In this paper, the mechanisms of the formation of the vortical packets and their mutual interactions are studied by DNS. It is found that the shear layer instability is the key of the vortex generation. On the other hand, in the process of evolution of vortical packets, the ...

متن کامل

Coherent structures in turbulent boundary layers with adverse pressure gradients

The coherent structures in turbulent boundary layers (TBLs) subjected to adverse pressure gradients (APGs) were investigated by analyzing a database of direct numerical simulations. The equilibrium adverse pressure gradient flows were established by using a power law free-stream distribution. The population trends of the spanwise vortices show that the outer regions of the APG TBLs are densely ...

متن کامل

Instabilities in turbulent boundary layers

An investigation of a model of turbulence generation in the wall region of a turbulent boundary layer is made through direct numerical simulations. The model is based on the instability of a streak. First, a laminar boundary layer disturbed by a continuous blowing through a slot is simulated in order to reproduce and further investigate the results reported from the experiments of Acarlar & Smi...

متن کامل

Coherent structures in direct numerical simulation of turbulent boundary layers at Mach 3

We demonstrate that data from direct numerical simulation of turbulent boundary layers at Mach 3 exhibit the same large-scale coherent structures that are found in supersonic and subsonic experiments, namely elongated, low-speed features in the logarithmic region and hairpin vortex packets. Contour plots of the streamwise mass flux show very long low-momentum structures in the logarithmic layer...

متن کامل

The hairpin vortex illusion

It has long been customary to assume that vortical structures in turbulent flows are synonymous with regions of rotational motion. Mathematical implementations of this idea using numerical and experimental velocity data from turbulent boundary layers reveal the presence of hairpin vortices, both singly and in groups called packets. However, vorticity may be present that does not directly cause ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2012