Gamma is a kernel programming language with an elegant chemical reaction metaphor in whichprograms are described in terms of multiset rewriting. Gamma formalism allows one to describe analgorithm without introducing a...Gamma is a kernel programming language with an elegant chemical reaction metaphor in whichprograms are described in terms of multiset rewriting. Gamma formalism allows one to describe analgorithm without introducing artificial sequentiality and leads to the derivation of a parallel solution to agiven problem naturally. However, the difficulty of incorporating control strategies makes Gamma not onlyhard for one to define any sophisticated approaches but also impossible to reach a decent level of efficiencyin any direct implementation. Recently, a higherorder multiset programming paradigm, named higher--order Gamma, is introduced by Metayer to alleviate these problems. In this paper, we investigate the possibility of implementing higherorder Gamma on Maspar, a massively data parallel computer. The results showthat a program written in higher--order Gamma can be transformed naturally toward an efficientimplementation on a real parallel machine.展开更多
利用超级计算机资源求解雷诺平均N-S方程(RANS),计算评估大量外形方案性能,在可接受的时间周期内完成民机飞发集成构型下机翼多目标优化设计。搭建了集成机翼CST参数化、复杂外形网格变形、快速CFD流场解算和自动后处理等关键环节,用遗...利用超级计算机资源求解雷诺平均N-S方程(RANS),计算评估大量外形方案性能,在可接受的时间周期内完成民机飞发集成构型下机翼多目标优化设计。搭建了集成机翼CST参数化、复杂外形网格变形、快速CFD流场解算和自动后处理等关键环节,用遗传算法全局寻优的优化系统。合理的流程设计使该系统可在"天河2号"超级计算机上同时对数百个方案实施计算评估。在并行计算、加速收敛等技术的综合运用下,使用包含800万单元的多块结构化网格,对NASA CRM (Common Research Model)机翼/机身/短舱/吊挂构型的计算分析可在15min内结束。在3点3目标优化案例中,用90个设计变量表达CRM机翼9个控制剖面的中弧线和扭转角,60h内完成了超过10000个外形方案的计算分析,遗传进化40代。与初始外形相比,PARETO前缘上选择的最优解的各设计点取得了2～10count(1count=阻力系数0.0001)的减阻效果。展开更多
In this paper, we give the convergence and consistence theory of multiple search direction conjugate gradient method (see [10]) and give some upper bound estimations of iterative value and error of our method.
文摘Gamma is a kernel programming language with an elegant chemical reaction metaphor in whichprograms are described in terms of multiset rewriting. Gamma formalism allows one to describe analgorithm without introducing artificial sequentiality and leads to the derivation of a parallel solution to agiven problem naturally. However, the difficulty of incorporating control strategies makes Gamma not onlyhard for one to define any sophisticated approaches but also impossible to reach a decent level of efficiencyin any direct implementation. Recently, a higherorder multiset programming paradigm, named higher--order Gamma, is introduced by Metayer to alleviate these problems. In this paper, we investigate the possibility of implementing higherorder Gamma on Maspar, a massively data parallel computer. The results showthat a program written in higher--order Gamma can be transformed naturally toward an efficientimplementation on a real parallel machine.
文摘利用超级计算机资源求解雷诺平均N-S方程(RANS),计算评估大量外形方案性能,在可接受的时间周期内完成民机飞发集成构型下机翼多目标优化设计。搭建了集成机翼CST参数化、复杂外形网格变形、快速CFD流场解算和自动后处理等关键环节,用遗传算法全局寻优的优化系统。合理的流程设计使该系统可在"天河2号"超级计算机上同时对数百个方案实施计算评估。在并行计算、加速收敛等技术的综合运用下,使用包含800万单元的多块结构化网格,对NASA CRM (Common Research Model)机翼/机身/短舱/吊挂构型的计算分析可在15min内结束。在3点3目标优化案例中,用90个设计变量表达CRM机翼9个控制剖面的中弧线和扭转角,60h内完成了超过10000个外形方案的计算分析,遗传进化40代。与初始外形相比,PARETO前缘上选择的最优解的各设计点取得了2～10count(1count=阻力系数0.0001)的减阻效果。
文摘In this paper, we give the convergence and consistence theory of multiple search direction conjugate gradient method (see [10]) and give some upper bound estimations of iterative value and error of our method.
