计算流体力学数值模拟验证与确认策略

Verification and Validation Strategies for Numerical Simulation in Computational Fluid Dynamics

数值模拟和工程仿真软件已成为理论研究、工程设计与事故分析的重要工具,其模拟结果的高可信度或仿真过程的真实性已成为人们追求的目标。文章从计算流体力学过程中"物理建模、数值建模、软件研制、数值实验、结果分析"五位一体考虑,分析了各阶段影响模拟结果可信度的重要因素,构建了爆轰流体力学模型验证、确认和不确定度量化(V&V&UQ)的策略及相关实施的关键技术,据此可以构建炸药爆轰弹塑性流体力学物理模型分层确认树型图,为研制高可信度爆轰流体力学数值模拟软件提供有效评估手段,为复杂工程研发高可信度模拟与仿真软件提供评估思路。

Numerical simulation and engineering simulation software has become an important tool in theoretical research, engi-neering design and accident analysis. The high confidence of simulation result or the authenticity of simulation process is the ultimate goal of scientific research. Based on the five factors of wphysical modeling, numerical modeling, software development, numerical experiments and result aIlalysis,, in the computational fluid mechanics, the important aspects influencing the confidence of simulation results are analyzed, and the key techniques of verification, validation and uncertainty quantification of detonation fluid dynamics model and relevant implementation are constructed. Based on those, a hierarchical validation tree model of the elasto-plastic hydro- dynamics model of explosive detonation can be constructed. It can also provide an effective evaluation method for the development of numerical simulation software for detonation fluid dynamics with high confidence, and provide an evaluation method for high confi-dence simulation and simulation software for complex engineering.