计算流体力学
流体力学
趋同(经济学)
自适应采样
物理
雷诺数
人工神经网络
流量(数学)
旋涡脱落
采样(信号处理)
超参数
统计物理学
应用数学
计算机科学
机械
湍流
算法
人工智能
数学
统计
光学
探测器
蒙特卡罗方法
经济
经济增长
作者
Wen Zhou,Shuichiro Miwa,Koji Okamoto
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2024-01-01
卷期号:36 (1)
被引量:7
摘要
Flow modeling based on physics-informed neural networks (PINNs) is emerging as a potential artificial intelligence (AI) technique for solving fluid dynamics problems. However, conventional PINNs encounter inherent limitations when simulating incompressible fluids, such as difficulties in selecting the sampling points, balancing the loss items, and optimizing the hyperparameters. These limitations often lead to non-convergence of PINNs. To overcome these issues, an improved and generic PINN for fluid dynamic analysis is proposed. This approach incorporates three key improvements: residual-based adaptive sampling, which automatically samples points in areas with larger residuals; adaptive loss weights, which balance the loss terms effectively; and utilization of the differential evolution optimization algorithm. Then, three case studies at low Reynolds number, Kovasznay flow, vortex shedding past a cylinder, and Beltrami flow are employed to validate the improved PINNs. The contribution of each improvement to the final simulation results is investigated and quantified. The simulation results demonstrate good agreement with both analytical solutions and benchmarked computational fluid dynamics (CFD) calculation results, showcasing the efficiency and validity of the improved PINNs. These PINNs have the potential to reduce the reliance on CFD simulations for solving fluid dynamics problems.
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