Methods for controlling the local spatial and temporal resolution of vortex particle simulations of bluff body aerodynamics problems
Methods for controlling the local spatial and temporal resolution of vortex particle simulations of bluff body aerodynamics problems
复制标题
控制钝体空气动力学问题涡粒子模拟局部空间和时间分辨率的方法
DOI：
10.1016/j.compfluid.2018.02.016
复制
发表时间：
2018
影响因子：
2.8
通讯作者：
Morgenthal
中科院分区：
文献类型：
--
作者：
Milani;Morgenthal
本文提出了一种新的自适应解决方案的涡粒子方法，允许多个尺度的有效分辨率是小的结构细节的海崖体周围的流动特性。该方法的效率来自于保持足够高的空间数值离散附近的流体-固体界面和一个渐进的粗化远离机构及其结构细节。粒子图的控制是通过基于高阶插值核的重新网格化来实现的，并且确保了不同尺度的流特征的准确表示，其分辨率对于精确计算受到分离流的浸没结构上的压力是至关重要的。由于时间积分所需的时间步长与空间分辨率直接相关，因此通过子步进技术实现的时间自适应性进一步增强了自适应性，该子步进技术用于控制执行粒子对流和扩散步骤的频率。所提出的技术的验证是通过模拟的冲动开始流过去的圆柱在雷诺数3000，其中空间和时间的策略是在第一次独立研究，然后结合到充分的适应性。一个相当高的计算效率相比，同样准确的非自适应模拟报告。通过模拟具有小的结构细节的桥拱几何形状的横截面的流动来进行精度和效率的进一步研究。研究的解的性质包括局部速度剖面和整体气动力系数的分辨率。这些揭示了全自适应策略的应用如何能够准确和有效地预测流动特征。结果表明，当比较新的方法与经典的涡粒子法时，速度提高了4到5倍。
This paper presents a novel adaptive solution strategy for vortex particle methods that allows the efficient resolution of multiple scales that are characteristic of flows around bluff bodies with small structural details. The efficiency of the method arises from maintaining a sufficiently high spatial numerical discretisation near the fluid-solid interface and a progressive coarsening away from the bodies and their structural details. The control of the particle map is achieved through remeshing based on high-order interpolation kernels and ensures an accurate representation of the flow features of different scales whose resolution is critical to an accurate computation of the pressures on the immersed structure subjected to separated flows. As the required time step of the time integration is directly related to the spatial resolution, the adaptivity is further enhanced by a temporal adaptivity realized through a sub-stepping technique for controlling the frequency at which the particle convection and diffusion steps are performed. The validation of the proposed technique is performed by simulations of the impulsively started flow past a circular cylinder at Reynolds number 3000, where both the spatial and the temporal strategies are at first independently studied and then combined to full adaptivity. A substantially higher computational efficiency compared to equally accurate non-adaptive simulations is reported. Further studies of accuracy and efficiency are performed by simulating the flow past the cross section of a bridge arch geometry featuring small structural details. Solution properties studied include the resolution of local velocity profiles and global aerodynamic coefficients. These reveal how the application of the full adaptive strategy enables for the accurate and efficient prediction of the flow features. The results indicate speed-ups of up to factor 4 to 5 when comparing the new approach to the classical Vortex Particle Method.
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影响因子：
4.1
作者：
J. Sethian;A. F. Ghoniem
通讯作者：
J. Sethian;A. F. Ghoniem
DOI：
10.1016/j.jweia.2016.02.003
发表时间：
2016-04
影响因子：
4.8
作者：
S. Chawdhury;G. Morgenthal
通讯作者：
S. Chawdhury;G. Morgenthal
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
I. Mortazavi;P. Micheau;A. Giovannini
通讯作者：
A. Giovannini
DOI：
10.1016/j.jweia.2008.04.004
发表时间：
2004-09
影响因子：
4.8
作者：
I. Taylor;M. Vezza;I. Salisbury
通讯作者：
I. Taylor;M. Vezza;I. Salisbury
数值桥梁空气动力学的进展和最新应用
影响因子：
1.1
作者：
G. Morgenthal
通讯作者：
G. Morgenthal