Simulacao paralela de transferencia de calor por radiacao

The work presented in this thesis focus on the development of scalable parallel radiative heat transfer (RHT) algorithms that may be employed in large scale simulations. In the present work parallel computing techniques are applied to two widely used RHT methods: the Discrete Transfer Method (DTM) and the Discrete Ordinates Method (DOM). Two parallelization strategies were employed for the DTM: Ray Decomposition Parallelization (RDP) and the Domain Decomposition Parallelization (DDP). The parallelized DTM was applied to 2 D and 3 D enclosures containing a gray emitting absorbing and isotropically scattering method. It is shown that the RDP is the most efficient method, mainly because the convergence rate is not influenced by the number of processors. The parallelization of the DOM was performed using the Angular Decomposition Parallelization (ADP) and the Domain Decomposition Parallelization (DDP). Furthermore three improved DDP DOM methods were proposed. They were developed with the aim of reducing the increase of the number of iterations to convergence observed when the number of processors increases. The influence of the number of processors and medium absorption coefficient were investigated for the standard DOM and for the three improved DOM methods. It was concluded that two of the improved methods duplicate the efficiency of the standard DOM for 64 processorsAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1249-074 Lisboa, Portugal / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga