考虑液滴相关界面过程的多孔介质中自由流动和流动耦合的多尺度三域方法
Multi-scale three-domain approach for coupling free flow and flow in porous media including droplet-related interface processes
摘要：
自由流/多孔介质流界面上的液滴对两种宏观流态之间的质量、动量和能量交换具有强烈的影响。由于尺度差距，在宏观尺度背景下对液滴相关的孔隙尺度过程进行建模是具有挑战性的，但由于相对较低的计算成本，可能是有益的。我们开发了一个三域的方法来模拟低维界面域中的液滴形成，生长，脱离和膜流。一个简单的放大技术允许计算液滴覆盖的界面面积分数，影响耦合通量。在第一场景中，仅考虑液滴形成、生长和脱离。然后，扩散和合并由于横向通量被认为是以及。仿真结果表明，这些液滴相关的过程的影响，可以捕获。然而，扩展是必要的，以更精确地表示对自由流的影响。
英文摘要：
Drops on a free-flow/porous-medium-flow interface have a strong influence on the exchange of mass, momentum and energy between the two macroscopic flow regimes. Modeling droplet-related pore-scale processes in a macro-scale context is challenging due to the scale gap, but might be rewarding due to relatively low computational costs. We develop a three-domain approach to model drop formation, growth, detachment and film flow in a lower-dimensional interface domain. A simple upscaling technique allows to compute the drop-covered interface area fraction which affects the coupling fluxes. In a first scenario, only drop formation, growth and detachment are taken into account. Then, spreading and merging due to lateral fluxes are considered as well. The simulation results show that the impact of these droplet-related processes can be captured. However, extensions are necessary to represent the influence on the free flow more precisely.
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