Unsteady three-dimensional viscous flow represents an important class of problems for which accurate methods of prediction are frequently required. Such applications are almost always complicated geometrically, may also involve relative motion between component parts, and exist in virtually all engineering disciplines. Mature computational methods are not always appropriate due to inherent method limitations. Unsteady viscous flowfields involving vortical wakes, interference effects, moving shocks, and body motion demand the most advanced computational means available. Currently, the only high-order method of prediction that is practical for such problems is the so called Chimera overset grid approach.
Many factors provide incentive for adopting an overset grid approach.
A geometrically complex problem can be reduced to a set of simple components. Limited memory resources can be accommodated by problem decomposition into appropriately sized components.