Space-time VMS computational flow analysis with isogeometric discretization and a general-purpose NURBS mesh generation metho
Space-time VMS computational flow analysis with isogeometric discretization and a general-purpose NURBS mesh generation metho
复制标题
具有等几何离散化和通用 NURBS 网格生成方法的时空 VMS 计算流分析
DOI：
10.1016/j.compfluid.2017.04.017
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发表时间：
2017
影响因子：
2.8
通讯作者：
and T.E. Tezduyar
中科院分区：
文献类型：
--
作者：
Y. Otoguro;K. Takizawa;and T.E. Tezduyar
摘要时空计算分析（STCA）的关键组成部分，包括ST变分多尺度（ST-VMS）方法和ST等几何分析（ST-IGA）正在越来越多地用于复杂几何形状的流体力学计算。在此类计算中，ST-VMS作为核心方法，由ST-IGA补充，有时还由其他关键组件（例如ST Slip Interface（ST-SI）方法）补充。为了使ST-IGA的使用，以及在更广泛的背景下伊加的使用，在流体力学计算中更加实用，NURBS体积网格生成需要尽可能简单和自动化。为此，我们提出了一种通用的NURBS网格生成方法。该方法是基于多块结构化网格生成与现有技术，该网格的投影到NURBS网格的补丁，对应于块，并恢复原始模型表面的程度，他们是适合于准确和强大的流体力学计算。该方法有望保持多块结构网格的细化分布和单元质量。ST-SI方法补充了通用网格生成的离散化灵活性，该方法允许在不损失精度的情况下，NURBS曲面片之间的C-1连续性，从而消除了曲面片之间的匹配要求。通过对涡轮增压器涡轮机和排气歧管的试验计算，表明本文提出的通用网格划分方法使伊加在流体力学计算中的应用更加实用。
Abstract The Space–Time Computational Analysis (STCA) with key components that include the ST Variational Multiscale (ST-VMS) method and ST Isogeometric Analysis (ST-IGA) is being increasingly used in fluid mechanics computations with complex geometries. In such computations, the ST-VMS serves as the core method, complemented by the ST-IGA, and sometimes by additional key components, such as the ST Slip Interface (ST-SI) method. To make the ST-IGA use, and in a wider context the IGA use, even more practical in fluid mechanics computations, NURBS volume mesh generation needs to be easier and as automated as possible. To that end, we present a general-purpose NURBS mesh generation method. The method is based on multi-block structured mesh generation with existing techniques, projection of that mesh to a NURBS mesh made of patches that correspond to the blocks, and recovery of the original model surfaces to the extent they are suitable for accurate and robust fluid mechanics computations. It is expected to retain the refinement distribution and element quality of the multi-block structured mesh that we start with. The flexibility of discretization with the general-purpose mesh generation is supplemented with the ST-SI method, which allows, without loss of accuracy, C− 1 continuity between NURBS patches and thus removes the matching requirement between the patches. We present a test computation for a turbocharger turbine and exhaust manifold, which demonstrates that the general-purpose mesh generation method proposed makes the IGA use in fluid mechanics computations even more practical.