当前位置: X-MOL 学术Int. J. Mech. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Numerical simulation of multiphase flows using an enhanced Volume-of-Fluid (VOF) method
International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2021-11-23 , DOI: 10.1016/j.ijmecsci.2021.106956
Faroogh Garoosi 1 , Kamel Hooman 2
Affiliation  

The main objective of the present work is to enhance the stability and accuracy of Volume-of-Fluid (VOF) method for simulating multiphase flow problems with large density ratios and moving interfaces. In order to accomplish this, a novel high-order TVD flux-limiter scheme is developed and applied to approximate the convective fluxes in the momentum, energy and volume fraction equations. Moreover, the classical implicit non-iterative PISO algorithm is modified according to SIMPLER algorithm and the combined model (PISOR) is then employed to handle the pressure-velocity coupling. Furthermore, the piecewise linear interface calculation (PLIC) based on the Efficient Least Squares Volume-of-Fluid Interface Reconstruction Algorithm (ELVIRA) is adopted for the treatment of the interface and curvature estimation. The robustness and consistency of the proposed modifications in handling violent free-surface flows involving interface rupture and coalescence are verified via simulation of several canonical test cases including: dam break over the dry and wet beds, rotating square patch of fluid and Rayleigh-Taylor Instability (RTI). The results show that, the proposed flux-limiter scheme can significantly suppress false-diffusion errors and maintain interface sharpness while preserving the boundedness and positivity of the volume fraction field. Moreover, it is found that the proposed PISOR model has robust convergence behavior in strongly coupled multiphysics problems and provides more stable and consistent results than the standard PISO and SIMPLER algorithms. The performance and efficiency of proposed models are further verified, for single phase flow, through analysis of transient entropy generation due to natural convection heat transfer in differentially heated cavity.



中文翻译:

使用增强的流体体积 (VOF) 方法对多相流进行数值模拟

目前工作的主要目标是提高流体体积 (VOF) 方法的稳定性和准确性,用于模拟具有大密度比和移动界面的多相流问题。为了实现这一点,开发了一种新颖的高阶 TVD 通量限制器方案,并将其应用于近似动量、能量和体积分数方程中的对流通量。此外,根据SIMPLER算法对经典的隐式非迭代PISO算法进行了修改,然后采用组合模型(PISOR)来处理压力-速度耦合。此外,采用基于有效最小二乘法流体界面重建算法(ELVIRA)的分段线性界面计算(PLIC)来处理界面和曲率估计。通过模拟几个典型的测试案例,包括:干湿层上的大坝破裂、旋转的方形流体块和瑞利 - 泰勒不稳定性(RTI)。结果表明,所提出的通量限制器方案可以显着抑制假扩散误差并保持界面清晰度,同时保持体积分数场的有界性和正性。此外,发现所提出的 PISO 模型在强耦合多物理场问题中具有稳健的收敛行为,并且提供比标准 PISO 和 SIMPLER 算法更稳定和一致的结果。进一步验证了所提出模型的性能和效率,对于单相流,

更新日期:2021-11-27
down
wechat
bug