Real-Time Fluid Simulation with Atmospheric Pressure Using Weak Air Particles
Abstract
Atmospheric pressure is important yet often ignored in fluid simulation, resulting in many phenomena being overlooked. This paper presents a particle-based approach to simulate versatile liquid effects under atmospheric pressure in real time. We introduce weak air particles as a sparse sampling of air. The weak air particles can be used to efficiently track liquid surfaces under atmospheric pressure, and are weakly coupled with the liquid. We allow the large-mass liquid particles to contribute to the density estimation of small-mass air particles and neglect the air’s influence on liquid density, leaving only the surface forces of air on the liquid to guarantee the stability of the two-phase flow with a large density ratio. The proposed surface force model is composed of density-related atmospheric pressure force and surface tension force. By correlating the pressure and the density, we ensure that the atmospheric pressure increases as the air is compressed in a confined space. Experimental results demonstrate the efficiency and effectiveness of our methods in simulating the interplay between air and liquid in real time.
Publication
Sang T, Chen W, Ma Y, et al. Real-Time Fluid Simulation with Atmospheric Pressure Using Weak Air Particles[C]//Computer Graphics International Conference. Springer, Cham, 2021: 151-164.
Paper
Real-Time Fluid Simulation with Atmospheric Pressure Using Weak Air Particles.pdf
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