By Frédéric Moisy, Javier Jiménez (auth.), SHIGEO KIDA (eds.)
ISBN-10: 1402041802
ISBN-13: 9781402041808
ISBN-10: 1402041810
ISBN-13: 9781402041815
Elementary vortices – these tubular swirling vortical constructions with targeted vorticity in most cases saw in several types of turbulent flows – play key roles in turbulence dynamics (e.g. enhancement of combining, diffusion and resistance) and symbolize turbulence information (e.g. intermittency). due to their dynamical value, manipulation of trouble-free vortices is anticipated to be potent and precious in turbulence keep an eye on in addition to in development of turbulence modeling. the main complex study works on hassle-free vortices and similar difficulties have been offered and mentioned on the IUTAM Symposium in Kyoto, Japan, 26-28 October 2004. This ebook includes forty contributions provided there, the topics of which disguise 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 publication could be worthwhile for readers of graduate and complex degrees within the box of fluid turbulence.
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Phys. Fluids 13, 2553–2563. Schumacher, J. 2001 Derivative moments in stationary homogeneous shear turbulence. J. Fluid Mech. 441, 109–118. DYNAMICS OF SMALL-SCALE VORTICITY AND STRAIN-RATE STRUCTURES IN THE TRANSITION FROM ISOTROPIC TO SHEAR TURBULENCE James G. A. edu Winston Lin Honeywell Transportation and Power Systems 3201 W. A. com Abstract Local topological and statistical measures of enstrophy and strain-rate structures are compared with global statistics to determine the effects of mean shear on the interactions between fluctuating vorticity and strain rate in DNS of transitioning isotropic to shear turbulence.
1997 The phenomenology of small-scale turbulence. Annu. Rev. Fluid Mech. 29, 435–472. , & Willaime, H. 1994 Measurement of the scaling of the dissipation at high Reynolds numbers Phys. Rev. E 50 (5), 3693–3700. jp Abstract A process for formation of the stretched spiral vortex was investigated using the DNS data of homogeneous turbulence. It was shown that vortex tube was generated not by a rolling up of single vortex sheet but through an interaction of dual sheets. Depending on the alignment of vorticity vectors on vortex tube and vortex sheets which emanate from vortex tube, three modes of configuration were shown to exist.
The thin and strong filaments around the vortex core have swirling motion. After long times (t/T > 5), these filaments are thinned and elongated enough to be dissipated by viscosity. 5. Summary We investigated the interaction between a columnar vortex and external turbulence using direct numerical simulations. We observed that the Lamb-Oseen vortex (q = −∞) wraps worms around itself which form spirals. Inside the vortex core, axisymmetric, and bending vortex waves are excited. The velocity disturbance corresponding to the worms become statistically axisymmetric, whereas the corresponding vorticity disturbance increases not only in the axisymmetric mode but also in other modes.
IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence Dynamics: Proceedings of the IUTAM Symposium held at Kyoto International Community House, Kyoto, Japan, 26-28 October 2004 by Frédéric Moisy, Javier Jiménez (auth.), SHIGEO KIDA (eds.)
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