In order to increase the rate of gas absorption, chemical reaction in the liquid phase is considered. The purpose of this paper was to simulate gas absorption process by a liquid film over a spherical packing incorporating eddy viscosity and diffusivity. Second order chemical reaction for two different cases (fast and slow) were considered. The system partial differential equations obtained...

The effect of the spanwise discretisation on numerical calculations turbulent flow around a circular cylinder is systematically assessed at subcritical Reynolds number 10000 in frame three-dimensional large-eddy simulation. eddy-viscosity k-equation subgrid scale model implemented to evaluate unsteady field. Large-eddy simulation known be reliable method resolve such challenging field, however,...

We compare the properties of ordinary strong magnetohydrodynamic (MHD) turbulence in a strongly magnetized medium with the recently discovered viscosity-damped regime. We focus on energy spectra, anisotropy, and intermittency. Our most surprising conclusion is that in ordinary strong MHD turbulence the velocity and magnetic fields show different high-order structure function scalings. Moreover ...

A generic shortcoming of constant-depth (or “z-coordinate”) ocean models such as MOM5 and Nucleus for European Models the Ocean (NEMO) is a tendency advection scheme to produce unphysical numerical diapycnal mixing, which may exceed explicitly parameterized mixing based on observed physical processes. Megann (2018, https://doi.org/10.1016/j.ocemod.2017.11.001) estimated effective diffusivity in...

This study aimed to highlight a general lack of clarity regarding the scale temporal averaging implicit in Ekman-type models. Under assumption time and depth-dependent eddy viscosity, we present an analytical Fourier series solution for wave-modified Ekman model. The depth dependence viscosity is based on K-Profile Parameterization (KPP) scheme. reproduces major characteristics diurnal variatio...

multichromatic wave source so that it was unnecessary for them to invoke eddy viscosity to smear out the critical level singularity which occurs for a monochromatic wave. The depth scale for the critical layer in (3) was determined by the spectral distribution of the IGW's rather than by viscosity as in (1). Since atmospheric IGW's are generally multichromatic, Lindzen and Holton's model is lik...

In a previous study [DD07b] we presented a novel visco-potential free surface flows formulation. The governing equations contain local and nonlocal dissipative terms. From physical point of view, local dissipation terms come from molecular viscosity but in practical computations, rather eddy viscosity should be used. On the other hand, nonlocal dissipative term represents a correction due to th...

We present a systematic development of energy-stable approximations of the two-dimensional shallow water (SW) equations, which are based on the general framework of entropy conservative schemes introduced in [Tad03, TZ06]. No artificial numerical viscosity is involved: stability is dictated solely by eddy viscosity. In particular, in the absence of any dissipative mechanism, the resulting numer...

In this paper, we focus on the implementation and verification of an extended Boussinesq model for surf zone hydrodynamics in two horizontal dimensions. The time-domain numerical model is based on the fully nonlinear Boussinesq equations. As described in Part I of this two-part paper, the energy dissipation due to wave breaking is modeled by introducing an eddy viscosity term into the momentum ...