Recent progress on coarse graining simulations

IF 2.9 3区数学 Q1 MATHEMATICS, APPLIED

Physica D: Nonlinear Phenomena Pub Date : 2026-05-01 Epub Date: 2026-01-22 DOI:10.1016/j.physd.2026.135116

Fernando F․ Grinstein, Vincent P․ Chiravalle, Robert K. Greene

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Abstract

We focus on coarse graining simulations based on the primary conservation equations, effectively codesigned physics and algorithms, and low-Mach-number corrected (LMC) hydrodynamics. Simulation methods involve LANL’s x-Radiation-Adaptive-Grid-Eulerian Large-Eddy Simulation, Besnard-Harlow-Rauenzahn (BHR) Reynolds-Averaged Navier-Stokes (RANS) approach, and Dynamic BHR – a paradigm bridging RANS and LES.

A relevant question addressed relates to whether 3D RANS and RANS/LES hybrids – the industry standards for aerospace and automotive research, are presently relevant for practical variable-density applications involving shocked and accelerated interface instabilities. Recent simulations of the GaTECH inclined mixing-layer shock-tube and NIF ICF-capsule experiments are used to demonstrate issues, challenges, and potential for 3D coarse grained LMC simulation strategies for robustly simulating complex transitional and coupled hydrodynamics-multiphysics with coarser resolution. Present LES readiness to provide accurate predictions at scale is demonstrated – whereas 3D RANS and RANS/LES bridging do not appear impactful in this context.

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粗粒化模拟研究进展

我们的重点是基于初级守恒方程的粗粒模拟，有效的协同设计物理和算法，以及低马赫数校正（LMC）流体动力学。模拟方法包括LANL的x-辐射自适应网格-欧拉大涡模拟，Besnard-Harlow-Rauenzahn (BHR) reynolds - average Navier-Stokes （RANS）方法，以及Dynamic BHR -一种连接RANS和LES的范式。一个相关的问题是，3D RANS和RANS/LES混合动力系统——航空航天和汽车研究的行业标准，目前是否适用于涉及冲击和加速界面不稳定性的实际变密度应用。最近对GaTECH倾斜混合层激波管和NIF icf胶囊实验的模拟显示了3D粗粒度LMC模拟策略的问题、挑战和潜力，这些策略可以以更粗的分辨率鲁棒地模拟复杂的过渡和耦合流体动力学-多物理场。目前的LES已经准备好提供大规模的准确预测，而3D RANS和RANS/LES桥接在这种情况下似乎没有影响。

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来源期刊

Physica D: Nonlinear Phenomena 物理-物理：数学物理

CiteScore

7.30

自引率

7.50%

发文量

213

审稿时长

65 days

期刊介绍： Physica D (Nonlinear Phenomena) publishes research and review articles reporting on experimental and theoretical works, techniques and ideas that advance the understanding of nonlinear phenomena. Topics encompass wave motion in physical, chemical and biological systems; physical or biological phenomena governed by nonlinear field equations, including hydrodynamics and turbulence; pattern formation and cooperative phenomena; instability, bifurcations, chaos, and space-time disorder; integrable/Hamiltonian systems; asymptotic analysis and, more generally, mathematical methods for nonlinear systems.