Results 51 to 60 of about 954,404 (186)
A Modified Gas-Kinetic Scheme for Turbulent Flow [PDF]
, 2013 By analogy with the kinetic theory of gases, most turbulence modeling strate- gies rely on an eddy viscosity to model the unresolved turbulent fluctuations. How- ever, the ratio of unresolved to resolved scales - very much like a degree of rarefaction - is not taken into account by the popular conventional schemes, based on the Navier- Stokes equations.
arxiv +1 more source
Cascade processes in rapidly rotating turbulence [PDF]
, 2018 The process of the kinetic energy and kinetic helicity transfer over the spectrum in an incompressible, rapidly rotating turbulent flow is considered. An analogue of the Fjortoft theorem for 3D rapidly rotating turbulence is proposed. It is shown that, similar to 2D turbulence, there are two cascades simultaneously: the inverse cascade of the kinetic ...
arxiv +1 more source
Non-equilibrium time-relaxation kinetic model for compressible turbulence modeling [PDF]
arXiv, 2021 For the first time, the non-equilibrium time-relaxation kinetic model (NTRKM) is proposed for compressible turbulence modeling on unresolved grids. Within the non-equilibrium time-relaxation framework, NTRKM is extended in the form of modified Bhatnagar-Gross-Krook model.
arxiv
Frontiers in Astronomy and Space Sciences, 2022 Particle-in-Cell simulations and statistical analysis are carried out to study the dynamic evolution of a collisionless, magnetized plasma with co-existing whistler turbulence and electron temperature anisotropy as the initial condition, and the ...
Chen Cui +2 more
doaj +1 more source
Global simulations of magnetorotational turbulence II: turbulent energetics [PDF]
, 2013 Magnetorotational turbulence draws its energy from gravity and ultimately releases it via dissipation. However, the quantitative details of this energy flow have not been assessed for global disk models. In this work we examine the energetics of a well-resolved, three-dimensional, global magnetohydrodynamic accretion disk simulation by evaluating ...
arxiv +1 more source
Hydrodynamics affected by submerged vegetation with different flexibility under unidirectional flow
Frontiers in Marine Science, 2023 Submerged vegetation changes the hydrodynamic characteristics of rivers, lakes, wetlands, and coastal zones. However, only a few studies have focused on the effect of flexible submerged vegetation on hydrodynamic characteristics under unidirectional flow.
Chenhui Wu +9 more
doaj +1 more source
A Dynamical Model of Plasma Turbulence in the Solar Wind [PDF]
, 2015 A dynamical approach, rather than the usual statistical approach, is taken to explore the physical mechanisms underlying the nonlinear transfer of energy, the damping of the turbulent fluctuations, and the development of coherent structures in kinetic plasma turbulence. It is argued that the linear and nonlinear dynamics of Alfven waves are responsible,
arxiv +1 more source
On dissipation time scales of the basic second-order moments: the effect on the Energy and Flux-Budget (EFB) turbulence closure for stably stratified turbulence [PDF]
Nonlinear Processes in Geophysics, 31, 395-408 (2024), 2023 The dissipation rates of the basic second-order moments are the key parameters playing a vital role in turbulence modelling and controlling turbulence energetics and spectra and turbulent fluxes of momentum and heat. In this paper, we use the results of direct numerical simulations (DNSs) to evaluate dissipation rates of the basic second-order moments ...
arxiv
Jitter Mechanism as a Kind of Coherent Radiation: Constrained by the GRB 221009A Emission at 18 TeV
The Astrophysical Journal, 2023 The emission of gamma-ray burst (GRB) 221009A at 18 TeV has been detected by the large high-altitude air shower observatory. We suggest jitter radiation as a possible explanation for the TeV emission for this energetic GRB. In our scenario, the radiation
Jirong Mao, Jiancheng Wang
doaj +1 more source
Turbulent kinetic energy in 2D isothermal interchange-dominated scrape-off layer ExB drift turbulence: Governing equation and relation to particle transport [PDF]
Physics of Plasmas 28, 012302 (2021), 2019 This paper studies the turbulent kinetic energy ($k_\perp$) in 2D isothermal electrostatic interchange-dominated ExB drift turbulence in the scrape-off layer and its relation to particle transport. An evolution equation for the former is analytically derived from the underlying turbulence equations.
arxiv +1 more source