UCNS3D: An open-source high-order finite-volume unstructured CFD solver

UCNS3D is an open-source computational solver for compressible flows on unstructured meshes. State-of-the-art high-order methods and their associated benefits can now be implemented for industrial-scale CFD problems due to the flexibility and highly-automated generation offered by unstructured meshes. We present the governing equations of the physical models employed in UCNS3D, and the numerical framework developed for their solution. The code has been designed so that extended to other systems of equations and numerical models is straightforward. The employed methods are validated towards a series of stringent well-established test problems against experimental or analytical solutions, where the full capabilities of UCNS3D in terms of applications spectrum, robustness, efficiency, and accuracy are demonstrated.UCNS3D是一款面向非结构化网格可压缩流场的开源计算求解器。依托非结构化网格所具备的灵活性与高度自动化的网格生成特性，如今可将前沿高阶数值方法及其优势应用于工业级计算流体动力学（Computational Fluid Dynamics，简称CFD）问题。本文详述了UCNS3D所采用的物理模型控制方程，以及为求解该类方程所开发的数值框架。该代码的架构设计使得其拓展至其他方程组与数值模型的操作十分简便。所采用的数值方法通过一系列严格且成熟的基准测试问题完成了验证，这些测试问题均配套有实验或解析解，由此完整展示了UCNS3D在应用覆盖范围、鲁棒性、计算效率与精度层面的综合性能。