Small-Scale Condensation Simulation On Complicated Curved Surface

Realistic simulation of temperature-governed natural phenomena is of great significance in graphics,which is an important research topic in fluid simulation.Such phenomena often involve several physical processes including heat transfer,phase transition and multiphase interactions,which bring difficulties to high-fidelity and high-resolution simulation.When simulating condensation phenomenon,many traditional approaches simply model phase transition based on a threshold of air temperature,and motion of small-scale condensed drops has been simplified or ignored,which result in inaccurate and unrealistic condensation simulation effects with artifacts and lack of details.Combining smooth particle hydrodynamics(SPH)and adaptive narrow band fluid implicit particle method(NB-FLIP),we propose a novel hybrid framework to faithfully model the multiphysical processes and the detailed dynamics of on-surface condensed drops.Physically,we carefully control the phase transition with dew point calculated by relative humidity.Moreover,we consider surface tension,adhesion and friction in addition to gravity to improve the fluid-solid interaction details.Numerically,we employ SPH for air simulation to precisely obtain the condensation position,while FLIP is employed to ensure detailed fluid-solid interactions with low numerical dissipation.Besides,we introduce dynamic contact angle method to achieve realistic condensation effects over intricate hydrophilic/hydrophobic interface.To ensure high-fidelity interactions while minimizing the computational cost,we develop an adaptive NB-FLIP solver with octree-based background grid to further improve the performance of our framework.In this paper,we simulate the condensation phenomenon in details based on the above methods.Experiments show that our approach can efficiently and realistically simulate the small-scale interactions between condensed drops and arbitrary fluid-solid interface.