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Subsubsection 3.12.2.13: Fluid Normal Velocity Up Subsection 3.12.2: Surface Loads Subsubsection 3.12.2.15: Fluid Rotational Velocity

#### 3.12.2.14 Fluid Velocity

In a fluid or fluid-FSI analysis, this boundary condition prescribes the fluid velocity vector relative to the mesh, , on a named surface, simultaneously satisfying the natural boundary condition for and prescribing essential boundary conditions on the wx, wy and wz components of at the nodes of each facet, based on the value of at each node (obtained by averaging from adjoining facets).
<surface_load type="fluid velocity" surface="surface1">
<scale lc="1">1.0</scale>
<velocity>0,0,1</velocity>

<surface_load type="fluid velocity" surface="surface1">