Results 101 to 110 of about 954,404 (186)

Transition from weak to strong turbulence in magnetized plasmas

New Journal of Physics, 2019
The scaling of turbulent heat flux with respect to electrostatic potential is examined in the framework of a reduced (4D) kinetic system describing electrostatic turbulence in magnetized plasmas excited by the ion temperature gradient instability ...
Vasil Bratanov, Swadesh Mahajan, David Hatch   +2 more
doaj   +1 more source

Turbulence models generator [PDF]

arXiv, 2007
In this paper we explore a possibility that all transport turbulent models are contained in a coarse-grained kinetic equation. Building on a recent work by H.Chen et al (2004), we account for fluctuations of a single -point probability density in turbulence, by introducing a``two-level'' (${\bf c,v}$)-phase-space, separating microscopic (${\bf c'\equiv
arxiv  

Relationship between Low-Level Jet Properties and Turbulence Kinetic Energy in the Nocturnal Stable Boundary Layer

, 2003
In the nighttime stable boundary layer (SBL), shear and turbulence are generated in the layer between the maximum of the low-level jet (LLJ) and the earth's surface.
R. Banta, Y. Pichugina, R. Newsom
semanticscholar   +1 more source

Existence for turbulent flows through permeable media with unbounded turbulent-depending coefficients [PDF]

arXiv
A mathematical model that governs turbulent flows through permeable media is considered in this work. The model under consideration is based on a double-averaging concept which in turn is described by the time-averaging technique characteristic of the turbulence k-epsilon model and by the volume-averaging methodology that is used to model unstable ...
arxiv  

Wave-Particle Based Multiscale Modeling and Simulation of Non-equilibrium Turbulent Flows [PDF]

arXiv
This paper presents a novel methodology for the direct numerical modeling and simulation of turbulent flows. The kinetic model equation is firstly extended to turbulent flow with the account of coupled evolution of kinetic, thermal, and turbulent energy.
arxiv  

Scale-space energy transport in anisotropic inhomogeneous buoyancy-driven turbulent flows [PDF]

arXiv
In this article, we introduce a new mathematical framework that can describe the budget of turbulence kinetic energy and heat transfer in both physical space and scale space of turbulence. We derived two exact transport equations for inhomogeneous and anisotropic buoyancy-driven incompressible turbulent flow. The two equations are the turbulent kinetic
arxiv  

Hemodynamic investigation of incomplete stent angioplasty with percutaneous transluminal angioplasty and stenting for severe intracranial atherosclerotic stenosis

Chinese Journal of Contemporary Neurology and Neurosurgery
Objective To explore the clinical efficacy and changes in hemodynamic parameters before and after incomplete stent angioplasty with percutaneous transluminal angioplasty and stenting (PTAS) for severe intracranial atherosclerotic stenosis.
HAN Yong⁃feng, YANG Lei, LI Hong, ZHANG Dong⁃liang, LIU Chao⁃song   +4 more
doaj   +1 more source

Attenuation mechanism of wall-bounded turbulence by heavy finite-size particles [PDF]

arXiv
To elucidate the attenuation mechanism of wall-bounded turbulence due to heavy small particles, we conduct direct numerical simulations (DNS) of turbulent channel flow laden with finite-size solid particles. When particles cannot follow the swirling motions of wall-attached vortices, vortex rings are shed around the particles.
arxiv  

Intermittency in the not-so-smooth elastic turbulence

Nature Communications
Elastic turbulence is the chaotic fluid motion resulting from elastic instabilities due to the addition of polymers in small concentrations at very small Reynolds ( $${{{{{{{\rm{Re}}}}}}}}$$ Re ) numbers.
Rahul K. Singh, Prasad Perlekar, Dhrubaditya Mitra, Marco E. Rosti   +3 more
doaj   +1 more source

Magnetohydrodynamic and kinetic scale turbulence in the near-Earth space plasmas: a (short) biased review

Reviews of Modern Plasma Physics, 2020
F. Sahraoui, L. Hadid, Shiyong Huang
semanticscholar   +1 more source