Create a wind simulation

To do:

Using the model you created, perform a wind simulation with wind coming from the direction marked as ”right” in the cube in the figure.

For the external flow volume, use the following guidelines:

• Height: 6 x the tallest building (buildings at the bottom).
• Space between buildings and downwind boundary: 15 x the tallest building
• Space between buildings and other sides: 5 x the tallest building.

For the wind input boundary condition you can use the following:

• Ux = 5*log((z-0)/1.5)/log((10-0)/1.5) m/s

(Note: if the wind vectors are coming from the wrong direction after the simulation, try –5 instead of 5. The correct value depends on the orientation of the model.)

Make a map of the resulting wind speeds at the pedestrian level (1.5 m above the ground). Use an appropriate colour scale to visualize the differences in wind speeds.

Use the “particle trace” filter to visualize how the highest wind speeds are created, i.e., where the wind in the most windy areas is coming from.

Discussion:

• In terms of wind, what areas are most suitable (comfortable) for outdoor activities? Can you explain for areas that experience high wind speeds why this is the case?