A variational multiscale framework for atmospheric turbulent flows over complex environmental terrains
A variational multiscale framework for atmospheric turbulent flows over complex environmental terrains
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DOI：
10.1016/j.cma.2020.113182
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发表时间：
2020-08
影响因子：
7.2
通讯作者：
M. Ravensbergen;T. A. Helgedagsrud;Y. Bazilevs;A. Korobenko
中科院分区：
文献类型：
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作者：
M. Ravensbergen;T. A. Helgedagsrud;Y. Bazilevs;A. Korobenko
将基于残差的变分多尺度(VMS)模型框架应用于模拟复杂环境地形上的大气流动。利用线性有限元和二次非均匀有理B样条(NURBS)离散的两个测试用例对VMS框架进行了验证。首先，使用三维轴对称高斯山(正态分布曲面)上的流动与有限元和NURBS离散化的结果进行比较。接下来，使用博伦山的实际地形来演示该框架的有效性。NURBS离散化方法与已发表的数值模拟和现场测量数据吻合较好，与线性有限元方法相比，NURBS离散化方法具有更高的每自由度精度。本文对复杂地形流动的实验和数值方法以及相应的挑战进行了全面的回顾，为本工作的发展提供了适当的背景。
A residual-based variational multi-scale (VMS) modeling framework is applied to simulate atmospheric flow over complex environmental terrains. The VMS framework is verified and validated using two test cases using linear finite element (FEM) and quadratic non-uniform rational B-spline (NURBS) discretizations. First, the flow over the 3D, axisymmetric Gaussian hill (normally distributed surface) is used to compare the results with FEM and NURBS discretization. Next, the actual terrain of the Bolund hill is used to demonstrate the efficacy of the framework. Good agreement with published data, coming from simulations and field measurements, is achieved, with the NURBS discretization showing much better per-degree-of-freedom accuracy compared with linear FEM. The paper includes a comprehensive review of experimental and numerical methods, and the corresponding challenges, for complex-terrain flows, which provides a proper context for the developments presented in this work.