Prev Subsubsection 220.127.116.11: Fluid Normal Velocity Up Subsection 3.12.2: Surface Loads Subsubsection 18.104.22.168: Fluid Rotational Velocity Next
22.214.171.124 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>
If a different vector value needs to be specified for each facet, use the following syntax,
<surface_load type="fluid velocity" surface="surface1"> <scale lc="1">1.0</scale> <velocity surface_data="inlet"/> </surface_load>
and provide the facet values in a user-defined SurfaceData map with name="inlet" and data_type="vec3" (Section 3.8.1↑).