This paper applies the meshfree Smoothed Particle Hydrodynamics （SPH） method with Graphical Processing Unit （GPU） parallel computing technique to investigate the highly complex 3-D dam-break flow in urban areas in...This paper applies the meshfree Smoothed Particle Hydrodynamics （SPH） method with Graphical Processing Unit （GPU） parallel computing technique to investigate the highly complex 3-D dam-break flow in urban areas including underground spaces. Taking the advantage of GPUs parallel computing techniques, simulations involving more than 107 particles can be achieved. We use a virtual geometric plane boundary to handle the outermost solid wall in order to save considerable video card memory for the GPU computing. To evaluate the accuracy of the new GPU-based SPH model, qualitative and quantitative comparison to a real flooding experiment is performed and the results of a numerical model based on Shallow Water Equations （SWEs） is given with good accuracy. With the new GPU-based SPH model, the effects of the building layouts and underground spaces on the propagation of dambreak flood through an intricate city layout are examined.展开更多
To contain the outbreak of COVID-19 in Wuhan,unprecedented interventions,including city lockdown and community closure,have been implemented.However,most of the current studies focused on evaluation of the city lockdo...To contain the outbreak of COVID-19 in Wuhan,unprecedented interventions,including city lockdown and community closure,have been implemented.However,most of the current studies focused on evaluation of the city lockdown,but paid limited attention to the impacts of the community containment measures within the city.This research addressed this important issue from the perspective of urban planning,based on the epidemic and remote sensing data of 194 communities of Wuhan.We found that the number of confirmed cases of communities is highly related to urban planning factors,e.g.area percentage of buildings and density of neighboring markets.These factors are relevant to the residents’activity patterns,which therefore impact the mode of virus transmission.Our research confirmed the effectiveness of the community-oriented control strategies,provided a valuable reference for other cities that are suffering from the epidemic,and exhibited new thoughts into future urban planning.展开更多
基金Project supported by the National Basic Research Development Program of China(973 Program,No.2012CB719705)the National Natural Science Foundation of China(Grant Nos.91024032,70833003)
文摘This paper applies the meshfree Smoothed Particle Hydrodynamics （SPH） method with Graphical Processing Unit （GPU） parallel computing technique to investigate the highly complex 3-D dam-break flow in urban areas including underground spaces. Taking the advantage of GPUs parallel computing techniques, simulations involving more than 107 particles can be achieved. We use a virtual geometric plane boundary to handle the outermost solid wall in order to save considerable video card memory for the GPU computing. To evaluate the accuracy of the new GPU-based SPH model, qualitative and quantitative comparison to a real flooding experiment is performed and the results of a numerical model based on Shallow Water Equations （SWEs） is given with good accuracy. With the new GPU-based SPH model, the effects of the building layouts and underground spaces on the propagation of dambreak flood through an intricate city layout are examined.
基金This work is supported by the National Natural Science Foundation of China[grant number 41771360]the National Natural Science Foundation of China[grant number 41971295]+3 种基金the National Program for Support of Top-notch Young Professionalsthe Hubei Provincial Natural Science Foundation of China[grant number 2017CFA029]the National Key R&D Program of China[grant number 2016YFB0501403]the Shenzhen Science and Technology Program[grant number JCYJ20180306170645080].
文摘To contain the outbreak of COVID-19 in Wuhan,unprecedented interventions,including city lockdown and community closure,have been implemented.However,most of the current studies focused on evaluation of the city lockdown,but paid limited attention to the impacts of the community containment measures within the city.This research addressed this important issue from the perspective of urban planning,based on the epidemic and remote sensing data of 194 communities of Wuhan.We found that the number of confirmed cases of communities is highly related to urban planning factors,e.g.area percentage of buildings and density of neighboring markets.These factors are relevant to the residents’activity patterns,which therefore impact the mode of virus transmission.Our research confirmed the effectiveness of the community-oriented control strategies,provided a valuable reference for other cities that are suffering from the epidemic,and exhibited new thoughts into future urban planning.
