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The model will be built by taking slices of the terrain, in the direction of the wind. A velocity graph will be made, using the generic panel code. Where the air accelerates too quickly the height of the control point will be raised ('too quickly' being dependant on if the flow is undergoing compression or not. This process is iterated until this steady flow is stable.
These slices are then used to form a surface. The normal of this surface will be projected up to form a higher surface, the height of this projection depending on the speed of the air at the point being projected. This surface is sampled in line with the original grid.
The project, sample and calulate speed process is repeated a couple of times to generate an approximate model of the airflow.
Below the original flow the wind slows down, and if the height above the ground is high enough the flows backwards, creating a rotor