abstract: this work presents a numerical study to investigate the heat transfer characteristics of a 2-d rectangular composite porous radiant burner (cprb). in the construction of porous burner, the porous layer is considered to be composite consisting of upstream and downstream layers with equal thickness but with different physical and radiative properties. in the present work, a two dimensio...

In this study, three-dimensional simulations are presented for laminar forced convection flow of a radiating gas over a backward-facing step in rectangular duct. The fluid is treated as a gray, absorbing, emitting and scattering medium. The three-dimensional Cartesian coordinate system is used to solve the governing equations which are conservations of mass, momentum and energy. These equations...

In this study heat extraction ratio of a solar pond was investigated numerically by using the Discrete Ordinates Method (DOM) with direct solver PARDISO nested dissection multithreaded preordering algorithm, and findings without exchanger were compared experimental data to validate simulation accuracy numerical approaches in Mediterranean climatic condition. The modeled same dimension as previo...

We present a method for accelerating discrete ordinates radiative transfer calculations transfer. Our works with nonlinear positivity fixes, in contrast to most acceleration schemes. The is based on the dynamic mode decomposition (DMD) and using sequence of rank-one updates compute singular value needed DMD. Using sequential allows us automatically determine number solution vectors include DMD ...

The aim of this paper is to retrieve the temperature-dependent refractive index distribution in parallel-plane semi-transparent media with combined conduction-radiation heat transfer, by measurement exit intensities over boundaries. finite volume method combination discrete ordinates used solve energy equation. results direct solution for both linear-spatially and linear-temperature-dependent d...

A new angular quadrature type termed Modified Simpson Trapezoidal (MST) is developed based on the conventional Simpson’s 1/3 rule where pattern over polar levels has a trapezoid shape. An adaptive coefficient correction scheme to enable our integrate flux subintervals separated by interior jump irregularities. two-dimensional test problem employed verify discretization error in uncollided S N s...