The initial objective of this project was to carry out a fundamental study of the transport characteristics of a variety of gases and organic solutes in room temperature ionic liquids. The goal was to combine information collected from a number of different experimental measurements in order to develop a fundamental understanding of the interactions governing transport in ionic liquids. Measure...

One strategy for proving the global existence of admissible solutions to the Cauchy problem for first-order systems of conservation laws, is to introduce a small amount of diffusion and then pass to the limit. Under some structural assumption, this task was achived by DiPerna when the diffusion is given by artificial viscosity. We showed recently that this program works also for the Jin–Xin rel...

We present a hydrodynamic model of ultracold, but not yet quantum condensed, dipolar Bosonic gases. Such systems both $s$-wave and scattering, the latter which results in anisotropic transport tensors thermal conductivity viscosity. This work presents an analytic derivation viscosity tensor coefficients, utilizing methods established [Wang et al., arXiv:2205.10465], where conductivities were de...

The viscosity over entropy density ratio, or KSS number, can help isolate the critical point in the hadron phase-diagram in Relativistic Heavy Ion Collisions. We argue that this quantity does have a minimum at a phase transition or crossover. Although indications from conventional non-relativistic gases point out to even a divergence in η/s when the phase-transition is first-order, since the cr...

This paper proposes a novel thermostat applicable to any particle-based dynamic simulation. Each pair of particles is thermostated either (with probability P) with a pairwise Lowe-Andersen thermostat [C. P. Lowe, Europhys. Lett. 47, 145 (1999)] or (with probability 1-P) with a thermostat that is introduced here, which is based on a pairwise interaction similar to the Nosé-Hoover thermostat. Whe...

Production of low-viscosity liquids (including condensates) from tight reservoirs (such as shales) is severely restricted by the ultra low-permeability of such formations, limiting production to a very small fraction (usually less than 5 percent) of the liquids-in-place. In this study, which is part of a wider investigation, we evaluate by means of numerical simulation several possible strategi...

Vibrational relaxation accounts for absorption and dispersion of acoustic waves in gases that can be significantly greater than the classical absorption mechanisms related to shear viscosity and heat conduction. This vibrational relaxation results from retarded energy exchange between translational and intramolecular vibrational degrees of freedom. Theoretical calculation of the vibrational rel...

Shock-accelerated bubbles have long been an intriguing topic for understanding the fundamental physics of turbulence generation and mixing caused by Richtmyer–Meshkov instability. In this study, impact bulk viscosity on flow morphology a shock-accelerated cylindrical light bubble in diatomic polyatomic gases is investigated numerically. An explicit mixed-type modal discontinuous Galerkin scheme...

The problem of deriving the nonequilibrium gas dynamic equations from the first principles of the kinetic theory of gases was studied by Ferziger and Kaper [1] in the cases of near-equilibrium and slow-relaxation processes of the energy exchange between internal and translational degrees of molecular freedom. The case of the arbitrary energy exchange ratio was analyzed in [2], [3], [4], [5] for...