Visual simulation of heat shimmering and mirage.
We provide a physically-based framework for simulating the natural phenomena related to heat interaction between objects and the surrounding air. We introduce a heat transfer model between the heat source objects and the ambient flow environment, which includes conduction, convection, and radiation. The heat distribution of the objects is represented by a novel temperature texture. We simulate the thermal flow dynamics that models the air flow interacting with the heat by a hybrid thermal lattice Boltzmann model (HTLBM). The computational approach couples a multiple-relaxation-time LBM (MRTLBM) with a finite difference discretization of a standard advection-diffusion equation for temperature. In heat shimmering and mirage, the changes in the index of refraction of the surrounding air are attributed to temperature variation. A nonlinear ray tracing method is used for rendering. Interactive performance is achieved by accelerating the computation of both the MRTLBM and the heat transfer, as well as the rendering on contemporary graphics hardware (GPU).
Zhao
Ye
Y
Department of Computer Science, Kent State University, Kent, OH 44242, USA. zhao@cs.kent.edu
Han
Yiping
Y
Fan
Zhe
Z
Qiu
Feng
F
Kuo
Yu-Chuan
YC
Kaufman
Arie E
AE
Mueller
Klaus
K
D000465:Algorithms; D003196:Computer Graphics; D003198:Computer Simulation; D006358:Hot Temperature; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods; D008962:Models, Theoretical; D009903:Optical Illusions; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013816:Thermodynamics