The importance of radiative heat transfer in the simulation of indoor-fire has been studied.Computer codes have been developed based on four-flux model and discrete transfer model,respectively.Evaluation of the codes ...The importance of radiative heat transfer in the simulation of indoor-fire has been studied.Computer codes have been developed based on four-flux model and discrete transfer model,respectively.Evaluation of the codes against exact analytic solution and experimental data shows that the discrete transfer model gives numerical results with acceptable accuracy while the four-flux model underpredicts the heat fluxes although the gen- eral trend is reasonable.Numerical studies have been performed of two-dimensional,axisymmetric turbulent, buoyancy-controlled indoor fire.The computational results show that neglecting radiation in the simulation can cause overprediction of 500K in the maximum temperature and less uniform velocity field compared to the prediction by discrete transfer model.The four-flux method has been found to produce less uniform velocity and temperature values than discrete transfer model,but is more economic in computation.展开更多
针对网络结构单一和消防语义信息贫乏导致的室内消防救援路径难以满足消防救援多样性任务需求的问题,基于建筑信息模型(building information modeling,BIM),集成地理信息系统(geographic information system,GIS)提出了一种1(基础路径...针对网络结构单一和消防语义信息贫乏导致的室内消防救援路径难以满足消防救援多样性任务需求的问题,基于建筑信息模型(building information modeling,BIM),集成地理信息系统(geographic information system,GIS)提出了一种1(基础路径网络)+N(专题路径网络)的室内消防救援多层路径网络模型,通过对案例区BIM数据进行解析,提取2230条路径网络要素信息(包括718个节点和1512条边),构建了室内基础路径网络模型,并在此基础上生成人员疏散、灭火和人员逃生3种专题路径网络.实验结果表明:该模型能够有效支持不同消防救援任务的路径规划需求,利用Dijkstra等算法成功计算出最短路径,验证了模型的可行性和实用性.展开更多
基金Sponsored by the National Natural Science Foundation of China
文摘The importance of radiative heat transfer in the simulation of indoor-fire has been studied.Computer codes have been developed based on four-flux model and discrete transfer model,respectively.Evaluation of the codes against exact analytic solution and experimental data shows that the discrete transfer model gives numerical results with acceptable accuracy while the four-flux model underpredicts the heat fluxes although the gen- eral trend is reasonable.Numerical studies have been performed of two-dimensional,axisymmetric turbulent, buoyancy-controlled indoor fire.The computational results show that neglecting radiation in the simulation can cause overprediction of 500K in the maximum temperature and less uniform velocity field compared to the prediction by discrete transfer model.The four-flux method has been found to produce less uniform velocity and temperature values than discrete transfer model,but is more economic in computation.
文摘针对网络结构单一和消防语义信息贫乏导致的室内消防救援路径难以满足消防救援多样性任务需求的问题,基于建筑信息模型(building information modeling,BIM),集成地理信息系统(geographic information system,GIS)提出了一种1(基础路径网络)+N(专题路径网络)的室内消防救援多层路径网络模型,通过对案例区BIM数据进行解析,提取2230条路径网络要素信息(包括718个节点和1512条边),构建了室内基础路径网络模型,并在此基础上生成人员疏散、灭火和人员逃生3种专题路径网络.实验结果表明:该模型能够有效支持不同消防救援任务的路径规划需求,利用Dijkstra等算法成功计算出最短路径,验证了模型的可行性和实用性.
