Description: The fluid exchange surface is part of a fluid cavity, and the cavity pressure is applied on it by default. If the fluid exchange surface represents a vent and is meshed such that it includes nodes away from its perimeter, the cavity pressure acting on the vent surface can lead to local bulging due to the typically soft stiffness used to represent the vent. The local bulging may lead to inaccurate leakage area computation, thus affecting the mass flow through the vent. To model the fluid exchange through a vent, Abaqus/Explicit provides an option to apply an equivalent line pressure load on the vent periphery.