The static shape of a fluid-filled membrane cylinder can be described by a set of nonlinear differential equations. These equations depend on a nondimensional parameter/3 representing the relative importance between pressure and the gravity force. The solution is found by three methods: similarity solution for small/3, asymptotic solution for large/3, and numerical integration.
Modeling and analysis techniques are used to investigate the performance of a massively parallel version of DIRECT, a global search algorithm widely used in multidisciplinary design optimization applications. Several high-dimensional benchmark functions and real world problems are used to test the design effectiveness under various problem structures. In this second part of a two-part work, theoretical and experimental results are compared for two parallel clusters with different system scale and network connectivity. The first part studied performance sensitivity to important parameters for problem configurations and parallel schemes, using performance metrics such as memory usage, load balancing, and parallel efficiency. Here linear regression models are used to characterize two major overhead sources-interprocessor communication and processor idleness-and also applied to the isoefficiency functions in scalability analysis. For a variety of high-dimensional problems and large scale systems, the massively parallel design has achieved reasonable performance. The results of the performance study provide guidance for efficient problem and scheme configuration. More importantly, the design considerations and analysis techniques generalize to the transformation of other global search algorithms into effective large scale parallel optimization tools.
The drag reduction on a circular cylinder through rotational oscillations is globally maximized by coupling a CFD solver with a novel parallel global deterministic optimization algorithm. The simulations are performed at a Reynolds number of 150 and the amplitude and frequency of the rotational oscillations are respectively constrained to the ranges 0.1 ≤ Ω ≤ 1.0 and 0.1 ≤ f Ω ≤ 3.0. The novelty of this work lies in the use of a massively parallel derivative free optimization algorithm to find the globally (not locally, as is typically done) optimal values of
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