Dissipation of coherent structures in confined two-dimensional turbulence
نویسندگان
چکیده
منابع مشابه
Lagrangian coherent structures and mixing in two-dimensional turbulence
We introduce a Lagrangian definition for the boundaries of coherent structures in two-dimensional turbulence. The boundaries are defined as material lines that are linearly stable or unstable for longer times than any of their neighbors. Such material lines are responsible for stretching and folding in the mixing of passive tracers. We derive an analytic criterion that can be used to extract co...
متن کاملCoherent structures, intermittent turbulence, and dissipation in high- temperature plasmas
Related Articles Residual turbulence from velocity shear stabilized interchange instabilities Phys. Plasmas 20, 012301 (2013) Freely decaying turbulence in two-dimensional electrostatic gyrokinetics Phys. Plasmas 19, 122305 (2012) Magnetic turbulence suppression by a helical mode in a cylindrical geometry Phys. Plasmas 19, 122304 (2012) Effect of secondary convective cells on turbulence intensi...
متن کاملEnstrophy dissipation in two-dimensional turbulence.
Insight into the problem of two-dimensional turbulence can be obtained by an analogy with a heat conduction network. It allows the identification of an entropy function associated with the enstrophy dissipation and that fluctuates around a positive (mean) value. While the corresponding enstrophy network is highly nonlocal, the direction of the enstrophy current follows from the Second Law of Th...
متن کاملLow-Dimensional Models of Coherent Structures in Turbulence
For uid ow one has a well-accepted mathematical model: the Navier-Stokes equations. Why, then, is the problem of turbulence so intractable? One major diÆculty is that the equations appear insoluble in any reasonable sense. (A direct numerical simulation certainly yields a \solution", but it provides little understanding of the process per se.) However, three developments are beginning to bear f...
متن کاملRegional statistics in confined two-dimensional decaying turbulence.
Two-dimensional decaying turbulence in a square container has been simulated using the lattice Boltzmann method. The probability density function (PDF) of the vorticity and the particle distribution functions have been determined at various regions of the domain. It is shown that, after the initial stage of decay, the regional area averaged enstrophy fluctuates strongly around a mean value in t...
متن کاملذخیره 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: Physics of Fluids
سال: 2017
ISSN: 1070-6631,1089-7666
DOI: 10.1063/1.4993488