多物理场预条件化用于热激活电池
Multi-physics Preconditioning for Thermally Activated Batteries
AI总结：
本文提出了一种多物理场预条件化方法，用于提高热激活电池模拟的计算效率和并行性能。
摘要：
热电池，也称为熔盐电池，是单次使用的备用电源系统，通过烟火热生成激活，将固体电解质转化为熔融状态。这些电池的模拟依赖于多物理场建模来评估其在各种条件下的性能和行为。本文介绍了在热激活电池模拟器（TABS）工具中可扩展预条件化策略的进展，使能够高效解决主导热电池模拟计算成本的耦合电化学系统。我们提出了一种通过Trilinos中的Teko包实现的分层块Gauss-Seidel预条件器，有效解决了紧密耦合物理问题带来的挑战，包括电荷传输、多孔流和物种扩散。该预条件器利用可扩展的子块求解器，包括平滑聚合代数多网格（SA-AMG）方法和域分解技术，以实现稳健的收敛性和并行可扩展性。强标量和弱标量研究证明了求解器能够处理多达5130万个自由度的问题，在2048个处理器上实现接近亚秒的设置和求解时间。这些进展显著提高了热电池模拟的计算效率和周转时间，为更高分辨率模型奠定了基础，并使从二维轴对称到全三维模拟的转变成为可能。
英文摘要：
Thermal batteries, also known as molten-salt batteries, are single-use reserve power systems activated by pyrotechnic heat generation, which transitions the solid electrolyte into a molten state. The simulation of these batteries relies on multiphysics modeling to evaluate performance and behavior under various conditions. This paper presents advancements in scalable preconditioning strategies for the Thermally Activated Battery Simulator (TABS) tool, enabling efficient solutions to the coupled electrochemical systems that dominate computational costs in thermal battery simulations. We propose a hierarchical block Gauss-Seidel preconditioner implemented through the Teko package in Trilinos, which effectively addresses the challenges posed by tightly coupled physics, including charge transport, porous flow, and species diffusion. The preconditioner leverages scalable subblock solvers, including smoothed aggregation algebraic multigrid (SA-AMG) methods and domain-decomposition techniques, to achieve robust convergence and parallel scalability. Strong and weak scaling studies demonstrate the solver's ability to handle problem sizes up to 51.3 million degrees of freedom on 2048 processors, achieving near sub-second setup and solve times for the end-to-end electrochemical solve. These advancements significantly improve the computational efficiency and turnaround time of thermal battery simulations, paving the way for higher-resolution models and enabling the transition from 2D axisymmetric to full 3D simulations.
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