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March 2019


Support Team - updated

How to prepare the topography for simulations?

If terrain or topography is relevant for the area of interest where you want to perform a wind prediction, follow these instructions. 

In the following image, the streamlines represent the average path of wind traveling near ground level. Note that the edge of the topography is affecting the wind behaviour in a non-desirable way (it does not represent how the wind would flow in the real world)!

With that in mind, please note the best practises for preparing and uploading a model with topography in the Wind Comfort app. For general instructions on how to prepare geometry, click here.

Create a slope connecting the topography to the ground level


Keep in mind: the edges of the model cannot be too thick or too high so that it does not disrupt or influence the airflow. The best way to set up a model for a wind tunnel simulation is by preparing a slope underneath the topography. The slope will act as a smooth path for the wind flow, allowing turbulence to be correctly predicted around your area of interest.



Ingrid Cloud will take the lowest level of your geometry to automatically set the ground level. All structures modeled on top of your terrain should be contained within the slope or the terrain area.



Extension of topography and overall model size

We recommend the area covered by topography (and its slope) to be at most 20% larger than the area of interest. That allows the wind to flow without possible disruptions caused by the edge of the model.


Keep in mind: Wind Comfort analysis will be displayed from a top view perspective, and all surfaces of the model will be analysed. The colour scheme for comfort criteria will be displayed at pedestrian level, as well as from the higher surfaces of the model, e.g. the rooftops.

Illustrative example