论文标题
可压缩流的非振荡性面部以面部为中心的有限体积方法
A non-oscillatory face-centred finite volume method for compressible flows
论文作者
论文摘要
这项工作提出了以面部为中心的有限体积(FCFV)范式,以模拟可压缩流。 FCFV方法定义了脸部barycentre的未知数,并使用杂交程序来消除细胞内部的所有自由度。另外,在数值通量的表达式中,将Riemann求解器隐含地定义。所得的方法提供了保守量的一阶准确近似值,即密度,动量和能量以及粘性应力张量和热通量的一阶准确近似,而无需任何梯度重建程序。因此,FCFV求解器在存在变形和高度拉伸的细胞的情况下保留了近似值的准确性,从而使求解器对网格质量不敏感。此外,FCFV能够构建急剧不连续性的非振荡近似值,而无需诉诸冲击捕获或限制技术。对于低马赫数的流量,该方法是可靠的,并且能够在不可压缩极限的情况下计算精确的解决方案,而无需引入特定的压力校正策略。提出了一组2D和3D基准,以验证从跨性别层到粘性层流的不同流程度中的方法,从跨性别者到亚音速不可压缩流,表明其在现实场景中处理可压缩流的潜力。
This work presents the face-centred finite volume (FCFV) paradigm for the simulation of compressible flows. The FCFV method defines the unknowns at the face barycentre and uses a hybridisation procedure to eliminate all the degrees of freedom inside the cells. In addition, Riemann solvers are defined implicitly within the expressions of the numerical fluxes. The resulting methodology provides first-order accurate approximations of the conservative quantities, i.e. density, momentum and energy, as well as of the viscous stress tensor and of the heat flux, without the need of any gradient reconstruction procedure. Hence, the FCFV solver preserves the accuracy of the approximation in presence of distorted and highly stretched cells, providing a solver insensitive to mesh quality. In addition, FCFV is capable of constructing non-oscillatory approximations of sharp discontinuities without resorting to shock capturing or limiting techniques. For flows at low Mach number, the method is robust and is capable of computing accurate solutions in the incompressible limit without the need of introducing specific pressure correction strategies. A set of 2D and 3D benchmarks of external flows is presented to validate the methodology in different flow regimes, from inviscid to viscous laminar flows, from transonic to subsonic incompressible flows, demonstrating its potential to handle compressible flows in realistic scenarios.