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

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.

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

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