Abstract

The interaction between the fluid flow and the deformable porous media is crucial in the applications of adsorption/absorption. The immersed boundary coupled lattice Boltzmann method is used in this study. The spring constant k of porous skeleton is introduced to consider the deformation effects. Subsequently, the evolutions of deformation of porous skeleton and hydrodynamic characteristics of fluid with k and Reynolds number are elucidated. The trend of deformation of porous skeleton appears as “concave front and convex back.” Moreover, the porosity of deformable porous media decreases gradually with the deformation growing. Meanwhile, the resistance of fluid flow increases due to the growing deformation of the porous skeleton. The larger k and Re contribute to the smaller drag coefficient. The deformation of the porous skeleton accelerates the detachment of the fluid boundary layer, and vortex patterns transfer from 2S to 2P mode with Reynolds number increasing when k = 0.05. Larger deformation leads to the higher pressure drop. The pressure drop for k = 0.01 is 21.7% higher than k = 0.05.

中文翻译：

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浸入式边界耦合格子Boltzmann方法模拟通过可变形多孔介质的流体流动的孔隙度模拟

摘要

流体流与可变形多孔介质之间的相互作用在吸附/吸收应用中至关重要。本研究采用沉浸边界耦合晶格玻尔兹曼方法。引入多孔骨架的弹簧常数k来考虑变形效应。随后，阐明了多孔骨架的变形演化和具有k和雷诺数的流体的流体力学特性。多孔骨架的变形趋势表现为“凹前凸后”。此外，随着变形的增长，可变形的多孔介质的孔隙率逐渐降低。同时，由于多孔骨架变形的增加，流体流动的阻力增加。较大的k和Re有助于较小的阻力系数。多孔骨架的变形加速了流体边界层的分离，并且当k  = 0.05时，随着雷诺数的增加，涡旋模式从2S模式转变为2P模式。较大的变形导致较高的压降。k  = 0.01的压降比k  = 0.05高21.7％。