Fluid droplets behave significantly different from larger fluid bodies. At smaller scales, surface tension and friction between fluids and the boundary play an essential role and are even able to counteract gravitational forces. There are quite a few existing approaches that model surface tension forces within an SPH environment. However, as often as not, physical correctness and simulation stability are still major concerns with many surface tension formulations. We propose a new approach to compute surface tension that is both robust and produces the right amount of surface tension. Conversely, less attention was given to friction forces at the fluid-boundary interface. Recent experimental research indicates that Coulomb friction can be used to describe the behavior of droplets resting on a slope. Motivated by this, we develop a novel friction force formulation at the fluid-boundary interface following the Coulomb model, which allows us to replicate a new range of well known fluid behavior such as the motion of rain droplets on a window pane. Both forces are combined with an IISPH variant into one unified solver that is able to simultaneously compute strongly coupled surface tension, friction and pressure forces.

Timo Probst

Matthias Teschner

ACM Transactions on Graphics

ACM TRANSACTIONS ON GRAPHICS (TOG) 是一份经过同行评审的科学期刊，旨在传播计算机图形学领域的最新发现。它自 1982 年以来由计算机协会出版。从 2003 年开始，所有在 SIGGRAPH 年度会议上被接受发表的论文都印在该期刊的夏季特刊上。

ACM Transactions on Graphics (TOG) is a peer-reviewed scientific journal aimed at disseminating the latest research findings in the field of computer graphics. It has been published by the Association for Computing Machinery since 1982. Since 2003, all papers accepted for presentation at the SIGGRAPH annual conference are included in the summer issue of this journal.

《ACM Transactions on Graphics》（TOG）是一本经过同行评审的科学期刊，旨在传播计算机图形学领域的最新研究成果。该期刊自1982年由计算机协会出版。从2003年起，所有在SIGGRAPH年度会议上接受发表的论文均会收录在该期刊的夏季特刊中。

Category	Quartile
计算机科学	1
计算机科学, 计算机软件工程	1

Unified Pressure, Surface Tension and Friction for SPH Fluids

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Journal Info

Category	Quartile
COMPUTER SCIENCE, SOFTWARE ENGINEERING	1