Latest papers in fluid mechanics

Dynamic jamming of dense suspensions under tilted impact

Physical Review Fluids - Fri, 06/21/2019 - 11:00

Author(s): Endao Han, Liang Zhao, Nigel Van Ha, S. Tonia Hsieh, Daniel B. Szyld, and Heinrich M. Jaeger

High-speed ultrasound imaging is used to reconstruct the three-dimensional flow field of dense cornstarch suspensions under tilted impact. Experiments show how jamming fronts propagate and get deformed in a nonaxisymmetric manner under different impact angles.

[Phys. Rev. Fluids 4, 063304] Published Fri Jun 21, 2019

Group theory analysis of early-time scale-dependent dynamics of the Rayleigh-Taylor instability with time varying acceleration

Physical Review Fluids - Fri, 06/21/2019 - 11:00

Author(s): Desmond L. Hill, Aklant K. Bhowmick, Dan V. Ilyin, and Snezhana I. Abarzhi

Group theory analysis of the Rayleigh-Taylor instability with an acceleration varying in time finds that the early time behavior depends on whether the acceleration decays faster or slower than 1/t2.

[Phys. Rev. Fluids 4, 063905] Published Fri Jun 21, 2019

Resonant response and optimal energy harvesting of an elastically mounted pitching and heaving hydrofoil

Physical Review Fluids - Thu, 06/20/2019 - 11:00

Author(s): Yunxing Su and Kenneth Breuer

Experiments using a cyber-physical hydrofoil, tested over a wide range of stiffness and damping coefficients, reveal that the optimal response is achieved at the structural resonant frequency where the leading-edge vortex formation is synchronized with the foil pithing and heaving.

[Phys. Rev. Fluids 4, 064701] Published Thu Jun 20, 2019

Rotational dynamics of a particle in a turbulent stream

Physical Review Fluids - Wed, 06/19/2019 - 11:00

Author(s): Yayun Wang, Adam Sierakowski, and Andrea Prosperetti

Numerical simulations of turbulent flow past a sphere immersed in decaying turbulence, free to rotate around a fixed center, are presented. This arrangement allows the same simulations with and without the sphere, thus permitting the identification of the flow features that most affect the sphere rotation.

[Phys. Rev. Fluids 4, 064304] Published Wed Jun 19, 2019


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