Wind Field Diastrophy

The purpose of the Wind Field Diastrophy is to progress slowly from an undisturbed flow in the model area to a flow around the structure.

To obtain this the buildings are made “solid” in 3 steps: In the first step (100%), the wind speed at the facades equals the free flow velocity, in the second (50%) it is half the free stream velocity and in the final step (0%) the wind speed is zero at the building walls which is the normal condition.

Possible Problems & Solution

High divergence after diastrophy

If the model are is very complex, the model might have troubles to solve the wind field.

Possible solutions: Small modifications in the model, increase the border grids or increase the model height.

See also Knowledge Base 10: Flow Problems

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