注意你的伴随解!无粘伴随解中网格不收敛现象
流体动力学
2023-11-22 v1 数值分析
数值分析
摘要
人们早已知道,二维和三维无粘伴随解在尖锐后缘处普遍奇异。本文描述了一种并发效应:基于升力和阻力的二维和三维无粘连续与离散伴随解在壁面边界上的数值强烈依赖于网格,且随网格加密并不收敛。进行了多种数值测试以刻画该问题。发现基于升力的伴随解在任何流动条件下均受影响,而基于阻力的伴随解在跨声速有升力流动中受影响。也考察了一个(层流)粘性算例,但未发现类似行为,这表明该问题仅存在于无粘流中。本文论证该行为由后缘伴随奇异性引起。
引用
@article{arxiv.2311.12504,
title = {Watch Your Adjoints! Lack of Mesh Convergence in Inviscid Adjoint Solutions},
author = {Carlos Lozano},
journal= {arXiv preprint arXiv:2311.12504},
year = {2023}
}
备注
This is a postprint (accepted version) of an article published in the AIAA Journal. The published version may differ from this postprint and is available at: Lozano, C. "Watch Your Adjoints! Lack of Mesh Convergence in Inviscid Adjoint Solutions". AIAA J (2019). https://doi.org/10.2514/1.J057259