爆轰数值模拟中物理模型分层确认实验研究

发布时间：2019-06-06 03:45

【摘要】：高可信度数值模拟软件已成为工程设计与事故分析的重要支撑,基于实验测量数据对复杂物理模型与多物理过程数值模拟软件可信度量化是发展高可信度数值模拟软件的最佳途径。炸药爆轰过程模拟采用物理模型大多是唯象建模,含有认知与偶然混合型不确定度,发展高置信度数值模拟软件必须基于实验数据量化其各类不确定度。文章基于验证与确认(VV)方法,明确定义模型分层确认中单一实验、基准实验、子系统试验和全系统试验的概念与内涵,据此构建炸药爆轰弹塑性流体力学数值模拟中物理模型分层确认树型图,此树型图为炸药爆轰过程物理模型确认所需确认试验及模型分层确认提供策略,并建议据此分层确认试验开展单层与跨层物理模型的不确定度量化,为研制高可信度数值模拟软件提供有效可行方法。
[Abstract]:High reliability numerical simulation software has become an important support for engineering design and accident analysis. It is the best way to develop high reliability numerical simulation software to quantify the reliability of complex physical model and multi-physical process numerical simulation software based on experimental measurement data. Most of the physical models used in explosive detonation process simulation are phenomenological models, which contain cognitive and accidental mixed uncertainties. The development of high confidence numerical simulation software must quantify all kinds of uncertainties based on experimental data. Based on the verification and confirmation (VV) method, this paper clearly defines the concepts and connotations of single experiment, benchmark experiment, subsystem test and whole system test in hierarchical confirmation of model. Based on this, the hierarchical confirmation tree diagram of physical model in the numerical simulation of explosive detonation elastoplastic fluid mechanics is constructed, which provides the strategy for the confirmation test and model stratification confirmation needed for the physical model confirmation of explosive detonation process. It is suggested that the uncertainty of single-layer and cross-layer physical models should be quantified according to the hierarchical confirmation test, which provides an effective and feasible method for the development of high reliability numerical simulation software.
【作者单位】：北京应用物理与计算数学研究所;山东科技大学数学学院;

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