The diapycnal mixing, entrainment and bottom boundary layer (BBL) dynamics in simulations of dense overflows are evaluated, using a generalized coordinate ocean model that can utilize terrain-following or z-level vertical grids and uses the Mellor–Yamada (M–Y) turbulence closure scheme to provide vertical mixing coefficients. Results from idealized dense water overflow experiments at resolution...

The Optical Plume Anomaly Detection (OPAD) program at the NASA Marshall Space Flight Center is UBing plume spectroscopy for the diagnosis of the Space Shuttle Main Engines. A challenging part of this program is matching high resolution spectral data with a physicist’s model of spectroscopy to produce estimates of metallic erosion through the plume. This paper describes the discovery process use...

A computational approach that combines the molecular dynamics (MD) breathing sphere model for simulation of the initial stage of laser ablation and the direct simulation Monte Carlo (DSMC) method for simulation of the multi-component ablation plume development on the timeand length-scales of real experimental configurations is presented. The combined multiscale model addresses different process...

Introduction Experiments were conducted to develop a As the development of Hall effect plasma thrusters comprehensive plume model for Hall effect plasma continues, potential missions beyond basic north-south thrusters. The purpose of the plume model developed in and east-west station keeping are being considered for this this paper is to give system integrators a guide to follow type of thruste...

We have developed a finite element model of convection in a spherical, axisymmetric shell that we use to simulate upwelling thermal plumes in the mantle. The finite element method provides the flexibility to include realistic properties such as temperature-dependent viscosity, the focus of this paper. We used this model to investigate the effect of temperature-dependent viscosity on the structu...

Pylaisia polyantha moss growing near intensive traffic in Geležinis Vilkas street at Vingis Park (Vilnius) was selected as an indicator of environmental pollution. Two models were applied for the study: Gaussian plume model – zinc emission from automobiles calculation and mathematical recalculating transport to concentration moss. Moss samples collected during spring, summer autumn. There no si...

The present reappraisal of the mantle plume hypothesis is perhaps the most exciting current debate in Earth science. Nevertheless, the fundamental reasons for why it has arisen are often not well understood. They are that 1) many observations do not agree with the predictions of the original model, 2) it is possible that convection of the sort required to generate thermal plumes in the Earth’s ...