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arXiv 2408.17364physics.flu-dyn
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用于翼型跨音速绕流的物理信息神经网络

Physics-Informed Neural Networks for Transonic Flows around an Airfoil

Simon Wassing, Stefan Langer, Philipp Bekemeyer

AI总结:

针对翼型跨音速绕流因激波局部不连续难以用物理信息神经网络准确求解的问题,提出局部引入人工耗散稳定激波的方法,比较不同粘性变体并验证其有效性,展示了参数化问题适用性,拓展了求解器应用场景。

摘要:

物理信息神经网络作为基于深度学习的参数化偏微分方程求解器已受到广泛关注。尤其在工程应用中,该方法颇具前景,因为单个神经网络可在多查询场景下替代大量经典仿真。直到最近,研究人员才通过利用网格变换对训练进行预处理,成功用物理信息神经网络求解了翼型亚音速绕流问题。然而,由于激波导致局部不连续,跨音速区的可压缩流无法被准确近似。在本文中,我们提出技术,以成功用物理信息神经网络近似亚音速和跨音速流的可压缩欧拉方程解。受求解守恒律的经典数值算法启发,所提方法局部引入人工耗散以稳定激波。我们比较了标量值和矩阵值人工粘性等不同粘性变体,并在翼型跨音速流动条件下验证了该方法,与有限体积仿真取得了良好一致性。最后,通过用单个网络近似不同攻角下的跨音速解,展示了其对参数化问题的适用性。这项工作使基于参数化神经网络的求解器能够应用于空气动力学及其他领域中一类新的工业相关流动条件。

英文摘要:

Physics-informed neural networks have gained popularity as a deep-learning based parametric partial differential equation solver. Especially for engineering applications, this approach is promising because a single neural network could substitute many classical simulations in multi-query scenarios. Only recently, researchers have successfully solved subsonic flows around airfoils with physics-informed neural networks by utilizing mesh transformations to precondition the training. However, compressible flows in the transonic regime could not be accurately approximated due to shock waves resulting in local discontinuities. In this article, we propose techniques to successfully approximate solutions of the compressible Euler equations for sub- and transonic flows with physics-informed neural networks. Inspired by classical numerical algorithms for solving conservation laws, the presented method locally introduces artificial dissipation to stabilize shock waves. We compare different viscosity variants such as scalar- and matrix-valued artificial viscosity, and validate the method at transonic flow conditions for an airfoil, obtaining good agreement with finite-volume simulations. Finally, the suitability for parametric problems is showcased by approximating transonic solutions at varying angles of attack with a single network. The presented work enables the application of parametric neural network based solvers to a new class of industrially relevant flow conditions in aerodynamics and beyond.

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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