IUTAM Symposium on Elementary Vortices and Coherent by Shigeo Kida

By Shigeo Kida

Common vortices – these tubular swirling vortical buildings with centred vorticity ordinarily saw in several types of turbulent flows – play key roles in turbulence dynamics (e.g. enhancement of combining, diffusion and resistance) and signify turbulence facts (e.g. intermittency). as a result of their dynamical significance, manipulation of hassle-free vortices is predicted to be potent and necessary in turbulence keep an eye on in addition to in development of turbulence modeling. the main complicated study works on uncomplicated vortices and comparable difficulties have been awarded and mentioned on the IUTAM Symposium in Kyoto, Japan, 26-28 October 2004. This publication comprises forty contributions awarded there, the themes of which hide vortex dynamics, coherent buildings, chaotic advection and combining, statistical houses of turbulence, rotating and stratified turbulence, instability and transition, dynamics of skinny vortices, finite-time singularity, and superfluid turbulence. The ebook might be helpful for readers of graduate and complex degrees within the box of fluid turbulence.

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2001 A classification method for vortex sheet and tube structures in turbulent flows. Phys. Fluids 13, 3756–3774. Horiuti, K. 2003 Roles of nonaligned eigenvectors of strain-rate and subgrid-scale stress tensors in turbulence generation. J. Fluid Mech. 491, 65–100. , and Takagi, Y. 2005 Effect of non-affine voscoelasticity on turbulence generation. in Proc. Int. Symp. on Engineering Turbulence Modelling and Measurements 6. , and Kaneda Y. 2002 Anisotropic velocity correlation spectrum at small scales in a homogeneous turbulent shear flow.

The extracted subvolume at each time is shown by the box. 6, then to AR ≈ 1 at St = 1, shortly after which the tube begins a transition to a hairpin vortex. As shown in Figs. 6(c)-(f), the process involves the elongating and flattening of the vortex tube and the bending over and formation of a rather flattened head that is distinct Dynamics of small-scale vorticity and strain-rate structures 29 from a single tube-like leg. As the vortex elongates and bends, the leg of the hairpin remains tube-like with little overlap with the more concentrated strainrate fluctuations.

3, 3–12. G. & Wang, Q. 1992 Structural evolution of homogeneous turbulence at different scales analyzed using 3D wavelet transforms. Phys. Fluids A. 4, 2538–2554. ´nez, J. G. S. 1993 The structure of Jime intense vorticity in homogeneous isotropic turbulence. J. Fluid Mech. 255, 65–90. Kida, S. & Tanaka, M. 1994 Alignment of vorticity and scalar gradient with strain rate in simulated Navier-Stokes turbulence. Phys. Fluids A. 339, 121–142. Lin, W-Q. 1993 Structural and Dynamical Characteristics of Intermittent Structures in Homogeneous Turbulent Shear Flow.

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