Turbulence research at large Reynolds numbers using high resolution DNS
نویسنده
چکیده
Wind, water flowing in a river, ocean currents, and air motion behind a moving car are very familiar to us, and we know that they are always turbulent flows, because the velocity and pressure of the fluid fluctuate with time and position and the flow pattern is random. Humans recognized fluid motion in antiquity; they utilized this motion and recorded it in various ways, such as in paintings by Hokusai Katsusika and Leonard da Vinci, and in literature. Nowadays, the importance of turbulence in scientific, engineering, and environmental contexts, such as in weather prediction, aircraft design, and air pollution, is widely recognized.
منابع مشابه
Parametric study of a viscoelastic RANS turbulence model in the fully developed channel flow
One of the newest of viscoelastic RANS turbulence models for drag reducing channel flow with polymer additives is studied in different flow and rheological properties. In this model, finitely extensible nonlinear elastic-Peterlin (FENE-P) constitutive model is used to describe the viscoelastic effect of polymer solution and turbulence model is developed in the k-ϵ-(ν^2 ) ̅-f framework. The geome...
متن کاملViscous Effects in Control of Near-Wall Turbulence
Prior studies of wall bounded turbulence control have utilized Direct Numerical Simulation (DNS) which has limited investigations to low Reynolds numbers where viscous effects may play an important role. The current paper utilizes Large Eddy Simulation (LES) with the dynamic subgrid-scale model to explore the influence of viscosity on one popular turbulence control strategy, opposition control,...
متن کاملDNS/LES Simulations of Separated Flows at High Reynolds Numbers
Direct numerical simulations (DNS) and large-eddy simulations (LES) simulations of flow through a periodic channel with a constriction are performed using the dynamic Smagorinsky model at two Reynolds numbers of 2800 and 10595. The LES equations are solved using higher order compact schemes. DNS are performed for the lower Reynolds number case using a fine grid and the data are used to validate...
متن کاملCondensation of cloud microdroplets in homogeneous isotropic turbulence
The growth by condensation of small water droplets in a three-dimensional homogeneous isotropic turbulent flow is considered. Within a simple model of advection and condensation, the dynamics and growth of millions of droplets are integrated. A droplet-size spectra broadening is obtained and it is shown to increase with the Reynolds number of turbulence, by means of two series of direct numeric...
متن کاملAsymptotic Exponents from Low-Reynolds-Number Flows
The high-order statistics of fluctuations in velocity gradients in the crossover range from the inertial to the Kolmogorov and sub-Kolmogorov scales are studied by direct numerical simulations (DNS) of homogeneous isotropic turbulence with vastly improved resolution. The derivative moments for orders 0 ≤ n ≤ 8 are represented well as powers of the Reynolds number, Re, in the range 380 ≤ Re ≤ 22...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001