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arXiv 2401.08705physics.flu-dyn
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基于物理信息神经网络与网格变换的翼型亚声速绕流求解器

A solver for subsonic flow around airfoils based on physics-informed neural networks and mesh transformation

Wenbo Cao, Jiahao Song, Weiwei Zhang

AI总结:

本文提出将物理信息神经网络与网格变换相结合,在均匀计算空间中学习翼型绕流,开发了适用于任意翼型的开源亚声速无黏流求解器,在稀疏网格上比二阶有限体积法误差降低近一个数量级,并在参数化攻角问题中具有显著优势。

摘要:

物理信息神经网络(PINNs)近年来已成为求解由偏微分方程(PDEs)控制的正问题和反问题的一种新兴流行方法。然而,在翼型绕流中,流体在前缘附近被大幅加速,导致局部出现更剧烈的变化,这使得PINNs难以捕捉。因此,PINNs仍很少被用于求解翼型绕流问题。在本研究中,我们将物理信息神经网络与网格变换相结合,利用神经网络在均匀计算空间而非物理空间中学习流动。网格变换避免了网络去捕捉局部剧烈变化以及学习带有内部边界(壁面边界)的流动。我们成功求解了无黏流动,并提供了一个适用于任意翼型的开源亚声速流动求解器。结果表明,该求解器具有高阶特性,在非常稀疏的网格上相比二阶有限体积法(FVM)实现了近一个数量级的误差降低。受限于神经网络的学习能力和优化困难,该求解器的精度不会随网格细化而显著提高。尽管如此,在细网格上它仍能达到与二阶FVM相当的精度和效率。最后,我们强调了该求解器在求解参数化问题方面的显著优势,因为它能够高效地获得关于攻角的连续参数空间中的解。

英文摘要:

Physics-informed neural networks (PINNs) have recently become a new popular method for solving forward and inverse problems governed by partial differential equations (PDEs). However, in the flow around airfoils, the fluid is greatly accelerated near the leading edge, resulting in a local sharper transition, which is difficult to capture by PINNs. Therefore, PINNs are still rarely used to solve the flow around airfoils. In this study, we combine physical-informed neural networks with mesh transformation, using neural network to learn the flow in the uniform computational space instead of physical space. Mesh transformation avoids the network from capturing the local sharper transition and learning flow with internal boundary (wall boundary). We successfully solve inviscid flow and provide an open-source subsonic flow solver for arbitrary airfoils. Our results show that the solver exhibits higher-order attributes, achieving nearly an order of magnitude error reduction over second-order finite volume methods (FVM) on very sparse meshes. Limited by the learning ability and optimization difficulties of neural network, the accuracy of this solver will not improve significantly with mesh refinement. Nevertheless, it achieves comparable accuracy and efficiency to second-order FVM on fine meshes. Finally, we highlight the significant advantage of the solver in solving parametric problems, as it can efficiently obtain solutions in the continuous parameter space about the angle of attack.

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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