Helical structure of longitudinal vortices embedded in turbulent wall-bounded flow

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

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

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Predictive model for wall-bounded turbulent flow.

The behavior of turbulent fluid motion, particularly in the thin chaotic fluid layers immediately adjacent to solid boundaries, can be difficult to understand or predict. These layers account for up to 50% of the aerodynamic drag on modern airliners and occupy the first 100 meters or so of the atmosphere, thus governing wider meteorological phenomena. The physics of these layers is such that th...

متن کامل

Investigation of wall-bounded turbulent flow using Dynamic mode decomposition

Dynamics mode decomposition (DMD) which is a method to construct a linear mapping describing the dynamics of a given time-series of any quantities is applied to the analysis of a turbulent channel flow. The flow fields are generated by direct numerical simulations for the friction Reynolds number Reτ = 190. The time-series of the flow fields in a short time-interval in the order of the wall-uni...

متن کامل

Large-Eddy Simulations of Longitudinal Vortices Embedded in a Turbulent Boundary Layer

Large-eddy simulations of pairs of artificially generated longitudinal vortices embedded in a two-dimensional turbulent boundary layer are performed to study the dynamics of the vortical structures and to provide the unsteady inflow data for use in a future turbomachinery simulation. An immersed boundarymethod is employed to represent the wall-mounted half-delta wings that generate the counter-...

متن کامل

Hairpin vortices in turbulent channel flow

The phenomenon of birth and development of hairpin vortices in the wall region of turbulent channel flow is investigated numerically. The system of the Navier-Stokes equations is integrated by using a mixed spectral-finite difference numerical technique following the procedure of the Direct Numerical Simulation of turbulence (DNS), with accuracy requirements such that all the essential turbulen...

متن کامل

Investigation on Turbulent Nanofluid Flow in Helical Tube in Tube Heat Exchangers

In this study, the thermal characteristics of turbulent nanofluid flow in a helical tube in the tube heat exchanger (HTTHE) were assessed numerically through computational fluid dynamics (CFD) simulation. The findings of both the turbulent models: realizable k-epsion (k-ε) and re-normalisation group (RNG) k-epsilon were compared. The temperature distribution contours show that realizable and RN...

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

ژورنال

عنوان ژورنال: Journal of Fluid Mechanics

سال: 2009

ISSN: 0022-1120,1469-7645

DOI: 10.1017/s0022112008004588