(PDF) Global solution and blow-up of a semilinear heat

a School of Mathematics and Statistics, W uhan University, Wuhan 430072, China b Department of Mathematics, Henan University of T echnolo gy, Zhengzhou, 450052, China a r t i c l e i n f o a b s t :Customer reviews:Vorticity and Turbulence This is very good book for understanding the mathematical aspects of turbulence. The book is clearly written and is dense with information. Contents include equations of motion, random flow and its spectra, the Kolmogorov theory, equilibrium flow in spectral variables and in two space dimensions, vortex stretching, polymers, percolation, and renormalization, and vortex equilibria in three-dimensional space.

Correlation Analysis on Volume Vorticity and Vortex in

The significance of vorticity and vortex in fluid noticed and dynamics has been well recognized at both fundamental and applied levels in past decades. Vorticity has rigorous mathematical definition which is the curl of velocity field, while its physical interpretation is not as self-evident as its mathematical definition . However, for David Lannes:Water Waves with vorticity and asymptotic Oct 29, 2015 · Speaker:David Lannes, University of Bordeaux Date:October 29, 2015 Title:Water Waves with vorticity and asymptotic models Abstract:Motivated by the study of nonlinear wave-current interactions (such as rip-currents) we study the influence of vorticity on surface water waves.We first derive a generalization of the classical Hamiltonian Zakharov-Craig-Sulem formulation of irrotational Liutex and Its Applications in Turbulence Research Vortex is a universal form of fluid rotational motion in nature and critical to vortex science and turbulence research. However, a rigorous and universally accepted mathematical definition remains an open issue before Liutex was proposed. This chapter briefly reviews the first and second generations of vortex identification methods.

Liutex-based and Other Mathematical, Computational and

The first chapter, Liutex A New Mathematical Definition of Vortex and Vorticity Decomposition for Turbulence Research, is written by Chaoqun Liu, Yisheng Gao and Yifei Yu at University of Texas at Arlington. For long time, people recognize vortex as vorticity tube and measure the vortex rotation strength by vorticity magnitude. Pattern formation in the FitzHugh-Nagumo model br000095 Shigeru Kondo, Reaction-diffusion model as a framework for understanding biological pattern formation, Science, 329 (2010) 1615-1632. Google Scholar Cross Ref br000100 Q. Zheng, J. Shen, Dynamics and pattern formation in a cancer network with diffusion, Commun. Remarks on Charney's Note on Geostropic Turbulence in Jul 01, 2001 · The first is an attempt to prove that, similar to 2D turbulence, energy in QG turbulence goes only upscale in the net. The second is a demonstration that 3D QG motion in terms of a 3D wavenumber in a stretched coordinate is isomorphic to 2D turbulence. Charney's proofs are shown here to be problematic.

Scaling properties of Navier-Stokes turbulence SpringerLink

Mar 01, 2009 · Abstract. The property of the velocity field and the cascade process of the fluid flow are key problems in turbulence research. This study presents the scaling property of the turbulent velocity field and a mathematical description of the cascade process, using the following methods:(1) a discussion of the general self-similarity and scaling invariance of fluid flow from the viewpoint of the Statistics of vertical vorticity, divergence, and strain Aug 31, 2013 · 1 Introduction  The submesoscale band of oceanic turbulence occupies length scales O(0.1 10 km) [Thomas et al., 2008] and is believed to play a critical role in upper ocean mixing.Submesoscale dynamics are characterized by equally strong influences of planetary vorticity, lateral, and vertical shears (Rossby and Richardson numbers O(1)). The Laminar-Turbulent Transition in a Boundary Layer-Part Aug 30, 2012 · 12 August 2005 Proceedings of the Royal Society A:Mathematical, Physical and Engineering Sciences, Vol. 461, No. 2062 Intermittency and Regularity Issues in 3D Navier-Stokes Turbulence 1 June 2005 Archive for Rational Mechanics and Analysis, Vol. 177, No. 1

The structure of intense vorticity in isotropic turbulence

Apr 26, 2006 · The structure of the intense-vorticity regions is studied in numerically simulated homogeneous, isotropic, equilibrium turbulent flow fields at four different Reynolds numbers, in the range Re = 35170. In accordance with previous investigators this vorticity is found to be organized in coherent, cylindrical or ribbon-like, vortices (worms). Vorticity - Find linkChorin, A.J. (1994), Vorticity and turbulence, Applied Mathematical Sciences, 103, Springer, ISBN 978-0-387-94197-4 2003 Atlantic hurricane season (8,994 words) [view diff] exact match in snippet view article find links to article Vorticity - Lanzhou UniversityVorticity is a mathematical concept used in circulation" or "rotation" (or more strictly, the local angular rate of rotation) in a fluid. The average vorticity in a small region of fluid flow is equal to the circulation around the boundary of the small region, divided by the area A of the small region.

Vorticity - Simple English Wikipedia, the free encyclopedia

Vorticity is a mathematical concept used in fluid dynamics.It can be related to the amount of "circulation" or "rotation" (or more strictly, the local angular rate of rotation) in a fluid.The average vorticity in a small region of fluid flow is equal to the circulation around the boundary of the small region, divided by the area A of the small region. Vorticity and turbulence (1994 edition) Open LibraryNov 17, 2020 · Vorticity and turbulence by Alexandre Joel Chorin, 1994, Springer-Verlag edition, in English Applied mathematical sciences ;, v. 103, Applied mathematical sciences (Springer-Verlag New York Inc.) ;, v. 103. Classifications Dewey Decimal Class 532/.0527 Library of Congress Vorticity generation in the shallow-water equations as The authors attempt to find a bridge between the vorticity dynamics of a finite cross-stream length hydraulic jump implied by the Navier-Stokes equations and that given by the shallow-water approximation (SWA) with the turbulence of the hydraulic jump parameterized. It is established that, in the actual hydraulic jump, there is horizontal vorticity associated with the time-mean flow in the

Vorticity, Turbulence, and Acoustics in Fluid Flow SIAM

Jul 18, 2006 · This paper presents recent and ongoing research in mathematical fluid dynamics and emphasizes the interdisciplinary interaction of ideas from large-scale computation, asymptotic methods, and mathematical theory. Three contemporary research topics are discussed in detail:(1) The generation of energetic small scales for incompressible fluid flow; (2) theories for eddy diffusivity and renormalization for turbulent transport; and (3) the interaction between nonlinear acoustics and vorticity Vorticity, defects and correlations in active turbulence Indeed, vorticity is a fundamental concept in inertial turbulence because regions of high vorticity are characteristic features of turbulent flows. Here, we argue that it is also a key quantity in active turbulence, but for a different reason. Mathematical, Physical and Engineering Sciences, 372:2029, Online publication date:28-Nov-2014.Vorticity and Turbulence Alexandre J. Chorin SpringerIt has long been understood that, at least in the case of incompressible flow, the vorticity representation is natural and physically transparent, yet the development of a theory of turbulence in this representation has been slow. The pioneering work of Onsager and of Joyce and Montgomery on the statistical mechanics of two-dimensional vortex systems has only recently been put on a firm mathematical