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Subsubsection 3.12.2.16: Fluid Resistance Up Subsection 3.12.2: Surface Loads Subsubsection 3.12.2.18: Biphasic-FSI Traction

#### 3.12.2.17 Fluid-FSI Traction

In a fluid-FSI analysis, the fluid traction across an interface between a fluid-FSI material and a solid domain must be prescribed explicitly as a traction boundary condition on the solid domain. Otherwise, the solid domain cannot sense the fluid pressure and viscous traction. Users must identify each surface on which this FSI surface load must be prescribed. There are no user-defined parameters for this surface load.
<surface_load type="fluid-FSI traction" surface="surface1">