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7.1.4 Zero Fluid Pressure
This boundary condition can be used to set the fluid pressure to zero in biphasic analysis. A zero pressure boundary condition on a surface defines a free-draining surface, in other words, fluid will be able to leave the model through this surface.
This boundary condition differs from a zero prescribed fluid pressure (see below) in that the degrees of freedom for a zero fluid pressure boundary will be removed from the linear system.