A Cartesian Immersed Boundary Method Based on 1D Flow Reconstructions for High-Fidelity Simulations of Incompressible Turbulent Flows Around Moving Objects
A Cartesian Immersed Boundary Method Based on 1D Flow Reconstructions for High-Fidelity Simulations of Incompressible Turbulent Flows Around Moving Objects
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DOI：
10.1007/s10494-022-00364-4
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
A. E. Giannenas;Nikolaos Bempedelis;F. Schuch;S. Laizet
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作者：
A. E. Giannenas;Nikolaos Bempedelis;F. Schuch;S. Laizet
本数值研究的目的是表明，最近开发的交替方向重建浸入边界方法（ADR-IBM） （Giannenas和Laizet在应用数学模型99:606 - 627,2021）可用于流固耦合（FSI）问题，并可与致动器线模型（ALM）和计算机辅助设计（CAD）接口相结合，用于高保真模拟具有转子和几何复杂浸入物体的流体流动问题。该方法通过三维三次样条插值，在物体边界上施加适当的边界条件，重建被浸入物体内部的人工流场。该方法的新功能通过以下流动配置进行了验证：将壁面建模为浸入边界的湍流通道流动，一自由度（2D）和两自由度（3D）圆柱体的涡激振动（VIVs），直升机旋翼和多旋翼无人机在悬停和向前运动中。这些模拟是用高阶流体流动求解器incompact3d进行的，它是基于二维域分解的，以便利用现代基于cpu的超级计算机。结果表明，ADR-IBM可用于FSI问题的研究和具有转子的复杂运动物体周围不可压缩湍流的高保真模拟。
The aim of the present numerical study is to show that the recently developed Alternating Direction Reconstruction Immersed Boundary Method (ADR-IBM) (Giannenas and Laizet in Appl Math Model 99:606–627, 2021) can be used for Fluid–Structure Interaction (FSI) problems and can be combined with an Actuator Line Model (ALM) and a Computer-Aided Design (CAD) interface for high-fidelity simulations of fluid flow problems with rotors and geometrically complex immersed objects. The method relies on 1D cubic spline interpolations to reconstruct an artificial flow field inside the immersed object while imposing the appropriate boundary conditions on the boundaries of the object. The new capabilities of the method are demonstrated with the following flow configurations: a turbulent channel flow with the wall modelled as an immersed boundary, Vortex Induced Vibrations (VIVs) of one-degree-of-freedom (2D) and two-degree-of-freedom (3D) cylinders, a helicopter rotor and a multi-rotor unmanned aerial vehicle in hover and forward motion. These simulations are performed with the high-order fluid flow solverIncompact3dwhich is based on a 2D domain decomposition in order to exploit modern CPU-based supercomputers. It is shown that the ADR-IBM can be used for the study of FSI problems and for high-fidelity simulations of incompressible turbulent flows around moving complex objects with rotors.