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Reduced Order Modeling for Supersonic Cavity Flows

机译:超声速腔流的降阶建模

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In this study, Proper Orthogonal Decomposition (POD) is used to obtain reduced order models for different supersonic cavity flow configurations. The preliminary study is performed for an open cavity with a length to depth ratio (L/D) of 5.07 and a Mach number of 1.5. The POD method is applied to x-velocity data obtained as a result of CFD simulations of the flow. The reduced order modeling method is applied to different cavity configurations that have different L/D ratios; 1, 3, 7.6 and 10. With POD results, effects of L/D ratios to the flow are presented. As the flow becomes more complex, the necessary number of modes to represent the system also increases. For each case, results of the developed reduced order models which represent the main flow characteristics with less data show good agreement with CFD results.
机译:在这项研究中,适当的正交分解(POD)用于获得不同超声速腔流动配置的降阶模型。对长径比(L / D)为5.07,马赫数为1.5的开放腔进行了初步研究。 POD方法应用于通过流动CFD模拟获得的x速度数据。降阶建模方法应用于具有不同L / D比的不同腔体配置; 1、3、7.6和10。使用POD结果,可以得出L / D比对流量的影响。随着流程变得越来越复杂,表示系统的必要模式数量也随之增加。对于每种情况,所开发的降阶模型的结果代表了主要的流量特性,但数据较少,与CFD结果显示出良好的一致性。

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