密闭空间多源烟雾扩散的实时仿真  

Real-time Simulation of Multi-source Smoke Diffusion in the Confined Space

作　　者：吕梦雅[1,2] 罗智[1,2] 唐勇[1,2] 李颖[1,2] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004 [2]河北省计算机虚拟技术与系统集成重点实验室,河北秦皇岛066004

出　　处：《小型微型计算机系统》2016年第4期851-854,共4页Journal of Chinese Computer Systems

基　　金：河北省自然科学基金项目(F2012203084)资助;国家自然科学基金项目(60970073)资助

摘　　要：实时动态烟雾的模拟是计算机图形学的研究热点,密闭空间多源烟雾扩散的实时仿真尤其具有挑战性.首先,为进一步表现存在障碍物的密闭空间中烟雾扩散态势,利用Kanilan功率密度谱建立密闭空间中小尺度可变风场,并考虑风力衰减因子,增强烟雾与障碍物的实时交互效果;同时,为提高实时性,引入Mac Cormack方法动态求解N-S方程中的对流项,大大的减少了计算量;其次,借助AABB包围盒技术实现网格的建模,使密闭空间不再是单一的矩形,可以表现不同形状的烟雾空间,拓展了烟雾扩散模拟的应用领域;然后,采用双向耦合的方法动态表现烟雾与移动障碍物之间的相互作用力,使交互细节更加逼真自然;最后,设计多种密闭空间多源烟雾扩散的实验实例,实验表明,能够实时模拟出密闭空间中烟雾扩散、抽离及与移动障碍物交互的自然逼真的效果.The simulation of dynamic smoke has been a popular research topic in computer graphics.Especially for simulation of multisource smoke diffusion in the confined space,achieving a similar realism in real time remains an open challenge.For further simulation of smoke diffusion in the confined space with obstacles,the Kanilan power spectral density was adopted to build the small scale variable wind field in the confined space,and a wind attenuation factor was considered to enhance the real-time interaction effects of the smoke and obstacles.In order to improve the real-time performance,the M ac Cormack method was introduced to dynamically solve the convective term in N-S equation,which greatly reduces the amount of calculation.The clever use of AABB bounding box may create different shapes of smoke space,which expands the application fields of smoke diffusion simulation.The interactions between the smoke and moving obstacles are expressed by a two-way coupling method,which makes the interaction details more realistic and natural.Experiments are designed in a variety of confined space with multi-source smoke,and the results showthat our method can realistically simulate the smoke diffusion,the extraction and interactions of moving obstacles in real time.

关 键 词：烟雾模拟 Kanilan 风力衰减因子 AABB包围盒 双向耦合 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]