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On the coupling of wall-model immersed boundary conditions and curvilinear body-fitted grids for the simulation of complex geometries
Computers & Fluids ( IF 2.8 ) Pub Date : 2021-05-04 , DOI: 10.1016/j.compfluid.2021.104996
Lucas Manueco , Pierre-Élie Weiss , Sébastien Deck

One of the main limitations in computational aerodynamics lies in the ability of CFD solvers to handle complex geometries while maintaining their accuracy. Among the currently available strategies, the Zonal Immersed Boundary Conditions (ZIBC) has shown its capability to introduce complex geometrical details for the simulations of high Reynolds turbulent flows. In this context, this work aims to extend the ZIBC framework, initially adapted to reproduce blockage effects, to take into account configurations where the influence of spatially developing boundary layers has to be accurately predicted. For this purpose, a compact sharp interface immersed boundary method has been developed for curvilinear grids. Moreover, a Thin Boundary Layer Equations (TBLE) wall model based on one-dimensional RANS Spalart-Allmaras equations is coupled with the IBC to model the inner part of compressible turbulent boundary layers. The coupling with the Zonal Detached Eddy Simulation (ZDES) approach is improved and permits to simulate turbulent flows capturing accurately the wall-normal gradients with a limited grid resolution. This strategy is applied to the simulation of a generic missile configuration (FG5) with an angle of attack of 10 using RANS and ZDES approaches. For the first time, wall quantities such as unsteady loads, including the viscous contribution, are accuratly reproduced on surfaces modelled with IBC using hybrid RANS/LES (ZDES) computations and for a realistic configuration at high Reynolds number. Such a reconstruction of physical quantities at the wall is achieved thanks to a precise reconstruction procedure using a TBLE wall model.



中文翻译:

用于模拟复杂几何形状的壁模型浸入边界条件和曲线贴体网格的耦合

计算空气动力学的主要限制之一在于 CFD 求解器在保持精度的同时处理复杂几何图形的能力。在当前可用的策略中,区域浸入边界条件 (ZIBC) 已显示出其为高雷诺数湍流模拟引入复杂几何细节的能力。在这种情况下,这项工作旨在扩展 ZIBC 框架,最初适用于重现阻塞效应,以考虑必须准确预测空间发展边界层影响的配置。为此,已经为曲线网格开发了一种紧凑的锐界面浸入边界方法。而且,基于一维 RANS Spalart-Allmaras 方程的薄边界层方程 (TBLE) 壁模型与 IBC 耦合以模拟可压缩湍流边界层的内部。与分区分离涡流模拟 (ZDES) 方法的耦合得到改进,并允许模拟湍流,以有限的网格分辨率准确捕获壁面法向梯度。该策略应用于模拟攻角为 的通用导弹配置(FG5)10使用 RANS 和 ZDES 方法。首次使用混合 RANS/LES (ZDES) 计算在使用 IBC 建模的表面上准确再现壁面数量,例如非定常载荷,包括粘性贡献,并用于高雷诺数下的真实配置。由于使用 TBLE 墙模型的精确重建程序,因此在墙上实现了物理量的这种重建。

更新日期:2021-06-05
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