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     Star External Flow
     Star Garden Movie      Vanke City Garden
     Doushi Garden Wind
     Indoor Airflow City Garden

Shanghai

Shenzhen

Wind around the Demonstration Building
Vanke City Garden

Yi Jiang

In Vanke City Garden, we will design a 12 m x 12 m unit. The study is for natural ventilation in summer.

Determination of Incoming Wind

In a typical summer day, the mean wind speed is 2 m/s and the prevailing wind direction is from north and south in Beijing (Chinese Building Design handbook). This study used north wind speed to be 2 m/s at the height of 10 meters above the ground. The incoming wind profile is

            U = c z1/4

where U is the mean wind speed, z is the height of the wind, and c is a constant. 

Results Obtained with a Computational Fluid Dynamics Program

The study will study cases with wind from different directions. This report gives the results with north wind and south wind.

Fig. 1 shows the site plot and the demonstration building is filled with red color.

For the northern wind,

Fig. 2 (3 Dimensional) and Fig. 3 (2 Dimensional) show the wind velocity distribution at height of 1.0 m above the ground.

Fig. 4 shows the wind velocity distribution at section 1-1 where the demonstration building located.

Fig. 5 The wind velocity distribution at 1m above the ground for the demonstration building with northern wind.

Fig. 6 The wind velocity distribution at 16m above the ground for the demonstration building with northern wind.

For the southern wind

Fig. 7 shows the wind velocity distribution at section 1-1 where the demonstration building located.

Fig. 8 The wind velocity distribution at 1m above the ground for the demonstration building with southern wind.

Fig. 9 The wind velocity distribution at 16m above the ground for the demonstration building with southern wind.

Analysis

The preliminary study shows that, when the wind is from north, the wind speed around the demonstration building is very low, about 0.1 m/s ~ 0.4 m/s, because of the long high-rise building on the northern side. By assuming there is no any high rise building on the south, the wind from south is calculated. The wind speed around the demonstration building is about 1m/s.

Required information

            The natural ventilation created by the north wind is very insignificant because the wind speed around the building is low (0.1 m ~ 0.4 m). The south wind seems to be better for natural ventilation, but the simulation requires building information on the southern part. This is because any buildings in the south have a significant impact on the airflow around the demonstration building. Currently, we have only a two-dimensional site file that does not show the building height. A three-dimensional AutoCad file is urgently needed from the Chinese partner.

Fig. 1 The plot for Vanke City Garden. (The demonstration building is filled with red)

 

Fig. 2 The wind velocity distribution 1m above the ground when the wind is from the north (3-D view)

Fig. 3 The wind velocity distribution at 1 m above the ground when the wind is from the north (2-D view)

 

Fig. 4 Wind velocity distribution at section 1-1 with northern wind.



Fig. 5 The wind velocity distribution at 1m above the ground for the demonstration building with northern wind.



Fig. 6 The wind velocity distribution at 16m above the ground for the demonstration building with northern wind.
Fig. 7 Wind velocity distribution at section 1-1 with southern wind.



Fig. 8 Wind velocity distribution at 1m above ground for the demonstration with the southern wind.




Fig. 9 Wind velocity distribution at 16 m above ground for the demonstration building with the southern wind.

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Last modified on November 27, 2000 by china@juintow.com.
 
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