A Parallel Implementation of the LTSn Method for a Radiative Transfer Problem
نویسندگان
چکیده
A radiative transfer solver that implements the LTSn method was optimized and parallelized using the MPI message passing communication library. Timing and profiling information was obtained for the sequential code in order to identify performance bottlenecks. Performance tests were executed in a distributed memory parallel machine, a multicomputer based on IA-32 architecture. The radiative transfer equation was solved for a cloud test case to evaluate the parallel performance of the LTSn method. The LTSn code include spatial discretization of the domain and Fourier decomposition of the radiances leading to independent azimuthal modes. This yields an independent radiative transfer equation for each mode that can be executed by a different processor in a parallel implementation. Speed-up results show that the parallel implementation is suitable for the used architecture. Keywords— RADIATIVE TRANSFER, DISCRETE ORDINATES, MPI, CLUSTER COMPUTING
منابع مشابه
Reconstruction of Chlorophyll Concentration Profile in Offshore Ocean Water using a Parallel Ant Colony Code
An inverse hydrologic optics problem is solved using a recent intrinsic regularization scheme coupled to a standard Ant Colony System (ACS). The regularization scheme pre-selects candidate solutions based on their smoothness, quantified by a Tikhonov norm. The Chlorophyll profile is reconstructed from radiance experimental measurements in the ocean water for several depths and single wavelength...
متن کاملHeat Transfer Study of Convective-Radiative Fin under the influence of Magnetic Field using Legendre Wavelet Collocation Method
The development and production of high performance equipment necessitate the use of passive cooling technology. In this paper, heat transfer study of convective-radiative straight fin with temperature-dependent thermal conductivity under the influence of magnetic field is carried out using Legendre wavelet collocation method. The numerical solution is used to investigate the effects of magnetic...
متن کاملPerformance Analysis of Radiative Transfer Algorithms in a Parallel Environment
Three algorithms for solving the radiative transfer equation (RTE) were studied: Hydrolight, PEESNA and LTSN. These algorithms correspond, respectively, to invariant imbedding, analytical discrete-ordinates and LTSN methods. As a first step, the performance of each algorithm was evaluated running in the same sequential machine. The related codes were used in a Hydrological Optics typical coasta...
متن کاملChlorophyll concentration profiles from in situ radiances by ant colony optimization
A methodology for the reconstruction of vertical profiles of the absorption (a) and scattering (b) coefficients in natural waters is presented. Reconstruction is performed using single-wavelength in situ radiance measurements at several depths. The depth is discretized by a multi-region approach assuming that absorption and scattering coefficients are constant in each region. The inverse proble...
متن کاملConjugate problem of combined radiation and laminar forced convection separated flow
This paper presents a numerical investigation for laminar forced convection flow of a radiating gas in a rectangular duct with a solid element that makes a backward facing step. The fluid is treated as a gray, absorbing, emitting and scattering medium. The governing differential equations consisting the continuity, momentum and energy are solved numerically by the computational fluid dynamics t...
متن کامل