Simulation for predicting thermal environment in urban areas and green areas

Keyword
Radiant heat transport, heat exchange, water vapor exchange, large eddy simulation
Information no
0433
Appeal point
Highly accurate large-eddy simulation method for urban areas and green areas with trees
By efficiently processing three-dimensional radiative heat transfer calculations, it realizes unsteady simulations that take into account the heat and steam fluxes of the tree crown
Summary
A simulation device having a highly accurate calculation of an unsteady spatial distribution of wind speed, temperature, and water vapor in a space where buildings and trees locate, and has the following configuration.
1) A means for generating simulation data for handling as a plurality of elements where radiant heat is transferred between each two elements, from spatial data where buildings and trees locate.
2) A means for calculating a view factor for each two elements in consideration of the order among the plurality of elements based on the simulation data
3) First calculation means for calculating the net radiant heat absorbed by each element using the view factor
4) Second calculating means for calculating an unsteady spatial distribution of wind speed, temperature and water vapor amount in the target space
5) Third calculating means for calculating the temperature of the leaves of each tree in the target space using the radiant heat absorbed by the leaves, the temperature of the atmosphere, the partial pressure of water vapor in the atmosphere, and the partial pressure of saturated water vapor on the leaf surface.
6) A fourth calculating means for calculating an unsteady spatial distribution of wind speed, temperature and water vapor amount in the target space by repeating the above first to third calculating means.
Schematic image
Application
Thermal environment evaluation for green spaces and building plans
Evaluation of cool island effect such as park green areas
Thermal environment analysis for planning heat stroke prevention measures
It can also be applied to evaluation of CO2 reduction effect in green areas
Relational patent
Item name
:
Simulation device, simulation method, and simulation program
Filing date
:
2013-11-14
Inventor(s)
Keigo Matsuda
Keiko Takahashi