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Figure 10: As in 2D, the error in the solution computed on a grid consisting of 1.0M orthogonal hexahedral cells was due entirely to the limit in resolution.
  
From:
Grid Generation: How Do You Define a Good Grid?
Posted Mon December 22, 2014 @08:18AM
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Application By John Rhoads, Ph.D.
Senior Engineer, Pointwise

Computational fluid dynamics (CFD) is essentially a series of approximations; the role of the practitioner is managing the magnitude of the errors in these approximations. In CFD, one of the most basic approximations lies in the type of cells used for the simulation. This article will address some of the potential pitfalls encountered with a generic cell-centered finite volume scheme.

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