We propose a novel three-way coupling method to model the contact interaction between solid and fluid driven by strong surface tension. At the heart of our physical model is a thin liquid membrane that simultaneously couples to both the liquid volume and the rigid objects, facilitating accurate momentum transfer, collision processing, and surface tension calculation. This model is implemented numerically under a hybrid Eulerian-Lagrangian framework where the membrane is modelled as a simplicial mesh and the liquid volume is simulated on a background Cartesian grid. We devise a monolithic solver to solve the interactions among the three systems of liquid, solid, and membrane. We demonstrate the efficacy of our method through an array of rigid-fluid contact simulations dominated by strong surface tension, which enables the faithful modeling of a host of new surface-tension-dominant phenomena includings: objects with higher density than water that remains afloat; ‘Cheerios effect’ where floating objects attract one another; and surface tension weakening effect caused by surface-active constituents.

Paper: https://lwruan.com/publication/waterstrider/    
Introduction Video: https://www.youtube.com/watch?v=3ejKNbtdfnY

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