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arXiv 2211.03022cs.LGcs.CEphysics.chem-phstat.ML
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基于物理信息的化学制表机器学习

Physics Informed Machine Learning for Chemistry Tabulation

University at Buffalo(布法罗大学)

Amol Salunkhe, Dwyer Deighan, Paul Desjardin, Varun Chandola

摘要:

湍流燃烧系统的建模需要对底层化学和湍流流动进行建模。同时求解这两个系统在计算上是不允许的。相反,考虑到两个子系统演化的尺度差异,这两个子系统通常单独(重新)求解。流行的方法,如小火焰生成的流形(FGM)使用两步策略,其中控制反应动力学被预先计算并映射到低维流形,其特征在于一些反应进程变量(模型简化),然后在运行时“查找”流形,以通过流动系统估计高维系统状态。虽然现有的工作集中在这两个步骤独立,在这项工作中,我们表明,联合学习的进度变量和查找模型,可以产生更准确的结果。我们建立在基础配方和实施ChemTab,包括动态生成的热化学状态变量(低维动态源项)。我们讨论了实现这种深度神经网络架构的挑战,并通过实验证明了它的优越性能。

英文摘要:

Modeling of turbulent combustion system requires modeling the underlying chemistry and the turbulent flow. Solving both systems simultaneously is computationally prohibitive. Instead, given the difference in scales at which the two sub-systems evolve, the two sub-systems are typically (re)solved separately. Popular approaches such as the Flamelet Generated Manifolds (FGM) use a two-step strategy where the governing reaction kinetics are pre-computed and mapped to a low-dimensional manifold, characterized by a few reaction progress variables (model reduction) and the manifold is then ``looked-up'' during the runtime to estimate the high-dimensional system state by the flow system. While existing works have focused on these two steps independently, in this work we show that joint learning of the progress variables and the look--up model, can yield more accurate results. We build on the base formulation and implementation ChemTab to include the dynamically generated Themochemical State Variables (Lower Dimensional Dynamic Source Terms). We discuss the challenges in the implementation of this deep neural network architecture and experimentally demonstrate it's superior performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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