Physical Review Fluids Volume 2018 Issue 1805

Journal Article

Energy transport due to pressure diffusion enhanced by helicity and system rotation in inhomogeneous turbulence

Inagaki, Kazuhiro; Hamba, Fujihiro

2018 Astrophysics

doi:10.1103/PhysRevFluids.3.124601

Abstract: It is known that turbulent energy is rapidly transferred in the direction of the rotation axis in a rotating system, in comparison with the non-rotating case. In this study, this phenomenon is investigated as a problem of energy diffusion expressed by the Reynolds averaged Navier-Stokes...

Open Access

Journal Article

An exploration of thermal counterflow in He II using particle tracking velocimetry

Mastracci, Brian; Guo, Wei

2018 Condensed Matter

doi:10.1103/PhysRevFluids.3.063304

Abstract: Visualization of thermal counterflow in He II using PIV (particle image velocimetry) and PTV (particle tracking velocimetry) is difficult because tracer particle motion can be influenced by both the normal fluid and superfluid components of He II as well as the quantized vortex tangle....

Open Access

Journal Article

Reduced-order modeling of fully turbulent buoyancy-driven flows using the Green's function method

Khodkar, M. A.; Hassanzadeh, Pedram; Nabi, Saleh; Grover, Piyush

2018 Nonlinear Sciences

doi:10.1103/PhysRevFluids.4.013801

Abstract: A One-Dimensional (1D) Reduced-Order Model (ROM) has been developed for a 3D Rayleigh-Bénard convection system in the turbulent regime with Rayleigh number $\mathrm{Ra}=10^6$. The state vector of the 1D ROM is horizontally averaged temperature. Using the Green's Function (GRF) method,...

Open Access

Journal Article

A geometric state function for two-fluid flow in porous media

McClure, James E.; Armstrong, Ryan T.; Berrill, Mark A.; Schlüter, Steffen; Berg, Steffen;

2018 Condensed Matter

doi:10.1103/PhysRevFluids.3.084306

Abstract: Models that describe two-fluid flow in porous media suffer from a widely-recognized problem that the constitutive relationships used to predict capillary pressure as a function of the fluid saturation are non-unique, thus requiring a hysteretic description. As an alternative to the...

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Physical Review Fluids Volume 2018 Issue 1805

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