The sub-floor of a data center is very similar to a weather system. There are mountains and valleys in the form of sub-floor congestion and opposing fronts coming from multiple CRAC units. All of these factors together create high and low pressure areas. It is imperative to know where these areas exist under the floor because will affect the air delivered to your cabinets.
As CRAC units come on and off line, high and low pressure areas change. Vortexes that resemble hurricanes are common under the subfloor. You do not want your high density cabinet placed in the eye of that storm. Air delivery will be little or reversed. Air can be drawn under the floor from above. The CFD modeling can predict the locations of the high and low pressure areas under all of the redundant CRAC scenarios.
The figure below illustrates how the air plume thru the perforated tile decreases as it nears the center of the sub-floor vortex.
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