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arXiv 2104.01049physics.flu-dyn
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低马赫数多相流传质的压力扩散界面法

A pressure-based diffuse interface method for low-Mach multiphase flows with mass transfer

Andreas D. Demou, Nicoló Scapin, Marica Pelanti, Luca Brandt

摘要:

本文提出了一种基于压力的四方程两相扩散界面模型的有效数值求解方法。所提出的方法有可能模拟低马赫流动与质量传递。与传统的保守四方程模型相比,所采用的方程组以体积分数、温度、速度和压力为主要变量。该模型包括粘度,表面张力,导热系数和重力的影响,并有能力将复杂的状态方程。此外,吉布斯自由能弛豫过程被用来模拟传质。所提出的方法的一个关键特征是使用高性能和可扩展的求解器来求解压力的亥姆霍兹方程,与类似的基于密度的方法相比,这大大降低了计算成本。我们证明了该方法的能力,通过扩展验证对一系列不同的测试用例,模拟具有大密度和粘度比的流量。最后,通过对三维泡核沸腾的模拟,证明了该方法在解决具有挑战性的相变流动方面的潜力。

英文摘要:

This study presents a novel pressure-based methodology for the efficient numerical solution of a four-equation two-phase diffuse interface model. The proposed methodology has the potential to simulate low-Mach flows with mass transfer. In contrast to the classical conservative four-equation model formulation, the adopted set of equations features volume fraction, temperature, velocity and pressure as the primary variables. The model includes the effects of viscosity, surface tension, thermal conductivity and gravity, and has the ability to incorporate complex equations of state. Additionally, a Gibbs free energy relaxation procedure is used to model mass transfer. A key characteristic of the proposed methodology is the use of high performance and scalable solvers for the solution of the Helmholtz equation for the pressure, which drastically reduces the computational cost compared to analogous density-based approaches. We demonstrate the capabilities of the methodology to simulate flows with large density and viscosity ratios through extended verification against a range of different test cases. Finally, the potential of the methodology to tackle challenging phase change flows is demonstrated with the simulation of three-dimensional nucleate boiling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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