Modal and transient dynamics of jet flows
X. Garnaud, L. Lesshafft, P. J. Schmid, and P. Huerre
The linear stability dynamics of incompressible and compressible isothermal jets are investigated by means of their optimal initial perturbations and of their temporal eigenmodes. The transient growth analysis of optimal perturbations is robust and allows physical interpretation of the salient instability mechanisms. In contrast, the modal representation appears to be inadequate, as neither the computed eigenvalue spectrum nor the eigenmode shapes allow a characterization of the flow dynamics in these settings.
(Click on the link to read more)
Geostrophic turbulence near rapid changes in stratification
K. S. Smith and E. Bernard
Geostrophic turbulence near horizontal surfaces on which the vertical velocity vanishes exhibits a forward cascade of buoyancy variance, characterized by a shallow energy spectrum, secondary roll-up of filaments, and a fat-tailed vorticity probability distribution. Such surfaces occur at rigid boundaries, but also at discontinuous jumps in stratification. Here we relax this mathematical idealization and investigate geostrophic turbulence near a rapid but smooth jump in stratification, modeled by N(z) = N0[1 + αtanh (z/h)]. (Click on the link to read more)
Numerical simulation of the dynamics of freely falling discs
Marcin Chrust, Gilles Bouchet, and Jan Dušek
We present a comprehensive parametric study of the transition scenario of freely falling discs. The motion of the discs is investigated by a direct numerical simulation of the solid-fluid interaction. The discs are assumed to be homogeneous and infinitely thin. The problem is shown to depend on two independent parameters, the Galileo number expressing the ratio between effects of gravity and viscosity and the non-dimensionalized mass characterizing the inertia of the disc. (Click on the link to read more)
- In the News: The Mathematical Butterfly Aerodynamic forces and vortical structures in flapping butterfly's forward flight by Naoto Yokoyama, Kei Senda, Makoto Iima, and Norio Hirai – recently published in Physics of Fluids - has been covered by Inside Science News Service. Read more about The Mathematical Butterfly.
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- Award Winners Announced at the APS-DFD Meeting
Physics of Fluids would like to congratulate the award winners recently announced at the Division of Fluid Dynamics annual meeting.
2012 Andreas Acrivos Dissertation Award:
William Durham, University of Oxford
2012 Francois Frenkiel Award:
Thomas Cubaud, Bibin M. Jose, and Samira Darvishi, Stony Brook University
2012 Fluid Dynamics Prize:
John Brady, California Institute of Technology
2012 Stanley Corrsin Award:
Daniel Lathrop, University of Maryland
- The 2012 Nobel Prize in Physics
The American Institute of Physics congratulates this year's Nobel Laureates in Physics, Serge Haroche and David J. Wineland “for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems."
- The Letters section of Physics of Fluids (PoF) is now freely available!
In an effort to continue to promote the rapid distribution of new findings in scientific research, AIP is happy to announce that full-text versions of papers published in the Letters sections of Physics of Fluids are now freely available. Under this new policy, any Letter published in the Journal after 1 January 2012 will be freely accessible online by anyone. The Letters section features fast-tracked publication of concise papers on significant new findings. Submit your work to PoF Letters today at http://pof.peerx-press.org.
- Congratulations to POF editor, L. Gary Leal, elected in 2011 to the American Academy of Arts and Sciences.
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