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Theory Manual Version 3.6
 Subsubsection 3.5.4.2: Tangential Flow Stabilization Up Subsection 3.5.4: Special Boundary Conditions Section 3.6: Weak Formulation for FSI 

3.5.4.3 Flow Resistance

Flow resistance is typically implemented when modeling arterial flow, where the finite element domain only describes a portion of an arterial network [107]. A flow resistance may be imposed on downstream boundaries to simulate the resistance produced by the vascular network with its branches and bifurcations. The resistance is equivalent to a mean pressure which is proportional to the volumetric flow rate , where is the resistance. Using the pressure-dilatation relation (5.17-5), equivalent to , this pressure may be prescribed as an essential boundary condition on the dilatation .
 Subsubsection 3.5.4.2: Tangential Flow Stabilization Up Subsection 3.5.4: Special Boundary Conditions Section 3.6: Weak Formulation for FSI