This model describes the one-directional pressure driven air flow through an opening based on user-provided tabular data describing the relation between mass flow rate and pressure difference over the component.

ṁ = f(Δp),

where is the volume flow rate and Δp is the pressure difference.

Based on the table input, a cubic hermite spline is constructed between all points except for the two last pairs of points. These point are connected linearly.

The constructed curve is the direct relation between and Δp.

A similar model is also used in the CONTAM software (Dols and Walton, 2015).



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