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Anisotropic triangles extruded from the boundary curves.
  
From:
Automated Unstructured Viscous Meshing
Posted Thu April 12, 2007 @03:33PM
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Grid Generation Automated unstructured grid generation is routinely used for complex CFD analysis on a wide variety of analysis problems. The speed and ease with which an unstructured mesh is created is seldom matched by other meshing techniques.

However, isotropic unstructured meshes, for example those including only tetrahedral cells, either degrade solution accuracy near viscous walls or require prohibitively large mesh sizes. The large velocity gradient in the boundary layer near viscous walls is best captured by a specialized element which is oriented perpendicular to the wall.

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