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arXiv 2203.05802physics.comp-phphysics.flu-dyn
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两相流数值模拟的精确守恒相场法

Accurate conservative phase-field method for simulation of two-phase flows

Suhas S. Jain

摘要:

在这项工作中,我们提出了一种新的相场模型的两相流的模拟是准确的,保守的,有界的,和强大的。所提出的模型保持了每个相的质量,并导致有界运输的体积分数。我们提出的结果从典型的测试情况下的下降平流和下降的剪切流,显示出显着的改善,在常用的保守相场法的准确性。此外,所提出的模型施加了较少的限制性的Courant-Friedrichs-Lewy条件,因此,是更便宜的相比,其他保守的相场模型。我们还提出了改进计算的表面张力力,并表明,所提出的改进显着降低了寄生速度在接口的大小。我们还推导出一个一致的和保守的动量输运方程的建议相场模型,并表明,该模型与一致的动量输运方程耦合时,离散的动能,这是一个充分条件的不可压缩流的数值稳定性,在没有耗散机制的结果。为了说明该方法在模拟高密度比湍流两相流的鲁棒性,我们提出了在有限和无限雷诺数的高密度比液滴负载的各向同性湍流的数值模拟。

英文摘要:

In this work, we propose a novel phase-field model for the simulation of two-phase flows that is accurate, conservative, bounded, and robust. The proposed model conserves the mass of each of the phases, and results in bounded transport of the volume fraction. We present results from the canonical test cases of a drop advection and a drop in a shear flow, showing significant improvement in the accuracy over the commonly used conservative phase-field method. Moreover, the proposed model imposes a lesser restrictive Courant-Friedrichs-Lewy condition, and hence, is less expensive compared to other conservative phase-field models. We also propose improvements on computation of surface tension forces and show that the proposed improvement significantly reduces the magnitude of spurious velocities at the interface. We also derive a consistent and conservative momentum transport equation for the proposed phase-field model and show that the proposed model when coupled with the consistent momentum transport equation results in discrete conservation of kinetic energy, which is a sufficient condition for the numerical stability of incompressible flows, in the absence of dissipative mechanisms. To illustrate the robustness of the method in simulating high-density ratio turbulent two-phase flows, we present the numerical simulations of high-density ratio droplet-laden isotropic turbulence at finite and infinite Reynolds numbers.

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