论文标题

基于通量重建框架的高阶动力学流量求解器

A high order kinetic flow solver based on flux reconstruction framework

论文作者

Li, Ji, Zhong, Chengwen, Liu, Sha

论文摘要

本文的目的是开发一种基于动力学无关的通量(KIF)方法和通量重建(FR)框架的高阶数值方法。 KIF的目的是在气体运动方案(GKS)的出色优点与较低的计算成本之间找到平衡。 KIF的想法可以看作是气体动机方案的无粘性分裂版本,Shu和Ohwada做出了基本贡献。在KIF中实现了完全热传输(TTT)方案(TTT)方案(TTT)方案(KFVS)方法的组合。使用与时间步长$ΔT$和平均碰撞时间$τ$相关的系数,KIF可以自适应地调节TTT和KFVS通量的权重。通过进行无粘性的分裂,KIF非常合适且易于集成到现有框架中。众所周知的FR框架被广泛用于稳健性,经济成本和紧凑性的优势。 KIF和FR的结合起源于三个动机。第一个目的是基于气体动力学理论开发高阶方法。第二个原因是保持GK的优势。最后的目的是设计方法应该更有效。在目前的工作中,我们使用KIF方法替换元素接口中应用的Riemann通量求解器。界面上的常见解决方案是根据气体动力学理论计算的,这使KIF和FR方案的组合更加合理且可用。当前方法的准确性和性能通过几种数值案例验证。泰勒绿色涡流问题已用于验证其模拟湍流的潜力。

The goal of this paper is to develop a high order numerical method based on Kinetic Inviscid Flux (KIF) method and Flux Reconstruction (FR) framework. The KIF aims to find a balance between the excellent merits of Gas-Kinetic Scheme (GKS) and the lower computational costs. The idea of KIF can be viewed as an inviscid-viscous splitting version of the gas-kinetic scheme, and Shu and Ohwada have made the fundamental contribution. The combination of Totally Thermalized Transport (TTT) scheme and Kinetic Flux Vector Splitting (KFVS) method are achieved in KIF. Using a coefficient which is related to time step $δt$ and averaged collision time $τ$, KIF can adjust the weights of TTT and KFVS flux in the simulation adaptively. By doing the inviscid-viscous splitting, KIF is very suitable and easy to integrate into the existing framework. The well understood FR framework is used widely for the advantages of robustness, economical costs and compactness. The combination of KIF and FR is originated by three motivations. The first purpose is to develop a high order method based on the gas kinetic theory. The second reason is to keep the advantages of GKS. The last aim is that the designed method should be more efficient. In present work, we use the KIF method to replace the Riemann flux solver applied in the interfaces of elements. The common solution at the interface is computed according to the gas kinetic theory, which makes the combination of KIF and FR scheme more reasonable and available. The accuracy and performance of present method are validated by several numerical cases. The Taylor-Green vortex problem has been used to verify its potential to simulate turbulent flows.

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