Abstract
Rapid urbanization has made urban space thermal environment (USTE) problems increasingly prominent. USTE research is important for improving urban ecological environment and building energy consumption. Most studies on USTE research progress have focused on meteorological observations and remote sensing methods, and few studies on USTE are based on computational fluid dynamics (CFD). During the past two decades, with the increasing applications of CFD in USTE research, comprehensively summarizing the phased results have become necessary tasks. This paper analyzes the current research status of CFD-based USTE simulation from six perspectives. First, we summarize the current research status of USTE simulation with CFD models that integrate ground observations and remote sensing technology. Second, we define and classify the spatial scope of CFD-based USTE simulations at different scales. Third, we systematically analyze the quantitative relationships among urban land type, the underlying surface structure, water bodies, green space and the corresponding changes in CFD-based USTE simulations. Fourth, we quantitatively analyze the impact of anthropogenic heat in CFD-based USTE simulations. Fifth, we summarize the corresponding USTE mitigation measures and methods based on the CFD simulation results. Finally, the outlooks and the existing problems in current research on CFD simulations of the USTE are analyzed.
Highlights
In recent years, with the acceleration of urbanization and the rapid development of industry, populations have been migrating to cities [1], resulting in various urban ecological and environmental problems [2]
Numerical simulation methods based on fluid dynamics are mainly divided into Numerical methods based (DNS), on fluidReynolds-averaged dynamics are mainly divided into three types: simulation direct numerical simulation
The average temperature deviation was 11%, and the average wind speed deviation was 19% [46]. These results indicated that the distribution of and changes in the urban space thermal and wind environment were predicted with high accuracy based the computational fluid dynamics (CFD)
Summary
With the acceleration of urbanization and the rapid development of industry, populations have been migrating to cities [1], resulting in various urban ecological and environmental problems [2]. The urban space thermal environment (USTE) is spatially expressed as the horizontal and vertical distributions of the surface temperature and atmospheric temperature fields [6]. Studying the USTE and spatially quantitatively analyzing the ing the distribution of the urban spatial temperature field, considering the effects of temdistribution of the urban spatial temperature field, considering the effects of temporally porally and spatially processes, is ofimportance great importance to urban ecological security and spatially varying varying processes, is of great to urban ecological security and and sustainable development. USTEs werewere often evaluated at the scalescale or mesoscale by comcombining and remote sensing technology. Thermal methods or or thethe integration of CFD andand remote sensing. Thermalenvironment environmentbased basedonon methods integration of CFD remote sensTherefore, a timely review of research on CFD simulations of of thethe isisvaluable ing.
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