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Error Analysis on Multi-Fidelity Design Spaces through Surrogate Modeling with an Emphasis on Scramjet Combustion

机译:通过以Scramjet燃烧为重点的替代模型对多保真设计空间进行误差分析

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摘要

Hypersonic vehicle design is a challenging problem. The main obstacle that makes this work challenging is the non-linear interdependency between each of the vehicle’s systems. Thus, when generating a vehicle design model for a hypersonic system, a large number of parameters must be considered. The addition of a single parameter into the design space leads to an exponential increase in the number of necessary single point solutions.This thesis will examine hypersonic vehicle design in a unique way that decreases the computational power required to achieve a more accurate solution. This was done through the examination of error vectors between multi-fidelity design spaces using Kriging surrogate models and superimposing the computed difference onto a low fidelity solver. By adding this empirical correction onto the low fidelity data, the accuracy of the computed metrics was improved by an order of magnitude in some cases.In proving this theory a simplified airfoil test case and a generic cavity scramjet, that included combustion chemistry, were investigated. Examination of both of these geometries required a sizable amount of computing resources. To meet this requirement a custom cloud controller that could dynamically load processor cores depending on individual computer workloads was developed. This computational cloud, as well as an automated case generation algorithm, were developed in order to process the hundreds of computational runs necessary.
机译:高超音速车辆设计是一个具有挑战性的问题。使这项工作充满挑战的主要障碍是每个车辆系统之间的非线性相互依赖性。因此,当生成用于超音速系统的车辆设计模型时,必须考虑大量参数。在设计空间中添加单个参数会导致必要的单点解的数量呈指数增长。本文将以一种独特的方式研究高超音速车辆的设计,以减少获得更精确解所需的计算能力。这是通过使用Kriging代理模型检查多保真设计空间之间的误差向量并将计算出的差异叠加到低保真求解器上来完成的。通过将这种经验校正添加到低保真度数据上,在某些情况下计算指标的准确性提高了一个数量级。在证明这一理论的基础上,研究了简化的机翼测试案例和包括燃烧化学在内的通用腔超燃冲压发动机。 。对这两个几何形状的检查都需要大量的计算资源。为了满足此要求,开发了可以根据各个计算机工作负载动态加载处理器核心的自定义云控制器。开发了这种计算云以及一种自动的案例生成算法,以便处理数百种必要的计算运行。

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    Basore Kevin Daniel;

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  • 年度 2012
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