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 Subsubsection 3.12.2.15: Fluid Rotational Velocity Up Subsection 3.12.2: Surface Loads Subsubsection 3.12.2.17: Fluid-FSI Traction 

3.12.2.16 Fluid Resistance

In a fluid or fluid-FSI analysis, this boundary condition prescribes an elastic pressure on a surface, where is the flow resistance and is the volumetric flow rate across the surface (calculated internally); is an optional offset pressure. The pressure is converted to a dilatation and prescribed as an essential boundary condition at the nodes of the facets.
<surface_load type="fluid resistance" surface="surface1">
  <R lc="1">7.93e+07</R>
  <pressure_offset lc="2">10640</pressure_offset>
<surface_load>
 Subsubsection 3.12.2.15: Fluid Rotational Velocity Up Subsection 3.12.2: Surface Loads Subsubsection 3.12.2.17: Fluid-FSI Traction