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9 papers · 2 filters
Computing collision stress in assemblies of active spherocylinders: applications of a fast and generic geometric method
Wen Yan, Huan Zhang, Michael J. Shelley
In this work, we provide a solution to the problem of computing collision stress in particle-tracking simulations. First, a formulation for the collision stress between particles i…
Cancellation exponents in isotropic turbulence and magnetohydrodynamic turbulence
X. M. Zhai, K. R. Sreenivasan, P. K. Yeung
Small scale characteristics of turbulence such as velocity gradients and vorticity fluctuate rapidly in magnitude and oscillate in sign. Much work exists on the characterization of…
Transition to turbulence scaling in Rayleigh-Bénard convection
Jörg Schumacher, Ambrish Pandey, Victor Yakhot +1
If a fluid flow is driven by a weak Gaussian random force, the nonlinearity in the Navier-Stokes equations is negligibly small and the resulting velocity field obeys Gaussian stati…
Lagrangian Data-Driven Reduced Order Modeling of Finite Time Lyapunov Exponents
Xuping Xie, Peter J. Nolan, Shane D. Ross +2
There are two main strategies for improving the projection-based reduced order model (ROM) accuracy: (i) improving the ROM, i.e., adding new terms to the standard ROM; and (ii) imp…
Steep cliffs and saturated exponents in three dimensional scalar turbulence
Kartik P. Iyer, Jörg Schumacher, Katepalli R Sreenivasan +1
The intermittency of a passive scalar advected by three-dimensional Navier-Stokes turbulence at a Taylor-scale Reynolds number of is studied using direct numerical simulation…
Fluctuating Hydrodynamics of Reactive Liquid Mixtures
Changho Kim, Andy Nonaka, John B. Bell +2
Fluctuating hydrodynamics (FHD) provides a framework for modeling microscopic fluctuations in a manner consistent with statistical mechanics and nonequilibrium thermodynamics. This…