Combining multiple engineering workstations into a network-based heterogeneous parallel computer allows the application of aerodynamic optimization with advanced computational fluid dynamics codes, which can be comput...
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Combining multiple engineering workstations into a network-based heterogeneous parallel computer allows the application of aerodynamic optimization with advanced computational fluid dynamics codes, which can be computationally expensive on mainframe supercomputers. This article introduces a nonlinear quasi-Newton optimizer designed for this network-based heterogeneous parallel computing environment utilizing a software called parallel Virtual Machine. This article will introduce the methodology behind coupling a parabolized Navier-Stokes flow solver to the nonlinear optimizer. This parallel optimization package is applied to reduce the wave drag of a body of revolution and a wing/body configuration with results of 5-6% drag reduction.
In this paper, a parallelcomputing technique using a semianalytical finite element method and its implementation method are studied, and the speedup in the elapsed computing time is discussed. The structural analysis...
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In this paper, a parallelcomputing technique using a semianalytical finite element method and its implementation method are studied, and the speedup in the elapsed computing time is discussed. The structural analysis of an axisymmetric body with nonaxisymmetric boundary conditions is considered by using a semianalytical finite element method. The displacements and the boundary conditions are expressed by a Fourier series. By the orthogonality properties of the Fourier series, the equilibrium equations are fully decoupled for each mode. Therefore, these decoupled equations can be well adapted to the individual processors of a parallel computer. Two example problems are considered for the verification of the developed code and for the application of the parallel processing to practical problems. The computing time by parallel processing is compared with that by sequential processing, and a large amount of improvement in the elapsed computing time is achieved by parallel processing. From the computational experiments, a speedup of 4.6 times in elapsed time is observed with six processors of Alliant FX2812 at Seoul National University.
In this article a finite element formulation based on an assumed states method is proposed for the solution of heat conduction problems with phase change at a fixed temperature. Attention is directed towards reduction...
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In this article a finite element formulation based on an assumed states method is proposed for the solution of heat conduction problems with phase change at a fixed temperature. Attention is directed towards reduction of computer cost through the use of an efficient formulation, solver, and algorithm. The procedure is applied to the analysis of an electrothermally deiced aircraft surface.
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