This study deals with a numerical investigation of coupled double diffusive natural convection thermal radiation in an annular cavity containing gray gas mixture. The black vertical cylindrical walls are maintained at different temperatures and concentrations to create cooperating flows. finite volume method (using the SIMPLER algorithm) is used solve governing equations discrete ordinate (with...

We present an algorithm that provides a frequency-domain solution of the equation of radiative transfer (ERT) for heterogeneous media of arbitrary shape. Although an ERT is more accurate than a diffusion equation, no ERT code for the widely employed frequency-domain case has been developed to date. In this work the ERT is discretized by a combination of discrete-ordinate and finite-volume metho...

Effective spatial domain decomposition for discrete ordinate (Sn) neutron transport calculations has been critical for exploiting massively parallel architectures typified by the ASCI White computer at Lawrence Livermore National Laboratory. A combination of geometrical and computational constraints has posed a unique challenge as problems have been scaled up to several thousand processors. Car...

Two alternative approaches to the solution of discrete ordinate transport are considered in the context of general unstructured grids. The more traditional approach considered is the solution of a lower triangular system of equations for the spatial intensity distribution. Alternatively, the iterative solution of the system of equations arising from a more general diierencing stencil is also co...

rock slope stability depends very much on the strength features of the rock and the geometrical and strength characteristics of the discontinuities (e.g., roughness, wall strength and persistence). since a rock mass is not a continuum, its behavior is dominated by such discontinuities as faults, joints and bedding planes. also, rock slope instability is a major hazard for human activities and o...

The method of discrete ordinates is commonly used to solve the Boltzmann transport equation. The solution in each ordinate direction is most efficiently computed by sweeping the radiation flux across the computational grid. For unstructured grids this poses many challenges, particularly when implemented on distributed-memory parallel machines where the grid geometry is spread across processors....

The compound parabolic concentrator (CPC) is designed and its optical thermal analysis performed in ANSYS. CPC sizing the optimal mass flow rate by maximum power point tracking (MPPT) method MATLAB are determined. radiative transfer equation solved Discrete Ordinate (DO) Mont Carlo (MC) models deduced flux divergence applied as a source term Navier-Stokes equations to model heat transfer. Resul...

observations over the globe. The modeling activities encompass diagnostic studies with a number of radiative transfer codes, particularly the Discrete Ordinate model of Stamnes et al. (1988) (DISORT), and the development of a highly flexible Monte Carlo model to compute the threedimensional (3-D) radiation field for any cloud (liquid water) distribution. In addition, a number of multifractal an...

In this study, a Computational Fluid Dynamics (CFD) model was developed to evaluate ultraviolet disinfection applesauce reactor. To simulate UV reactors, three sets of equations, including hydrodynamics, radiation and species mass conservation were solved simultaneously. The Realizable k-e turbulence model and the discrete ordinate method were used to find the UV radiation profile through the r...