A Toolkit for Parallel Overset Grid AssemblyTargeting Large-Scale Moving BodyAerodynamic Simulations
George Zagaris, Michael T.Campbell, Daniel J. Bodony, Eric Shaffer,and Mark D. Brandyberry
Proceedings, 19th International Meshing Roundtable, Springer-Verlag, pp.385-402, October 3-6 2010
19th International Meshing Roundtable
Chattanooga, Tennessee, USA.
October 3-6, 2010
University of Illinois at Urbana-Champaign, IL, 61801, USA.
IllinoisRocstar LLC, IL, 61801, USA.
The Overset (Chimera) Grid approach has many practical benefits for
unsteady moving grid simulations. However, an inherent requirement and challenge
is the need to establish the inter-grid communication and donor-receiver pairs where
the solution must be exchanged between overlapping grids via a process formally
known as overset grid assembly. Furthermore, in the context of large-scale unsteady
simulations, grid assembly is performed at each time-step and typically must operate
on a set of already distributed grids. We call this problem the distributed overset
grid assembly problem. The implementation of techniques to eciently handle the
distributed overset grid assembly problem is the primary topic of this paper. In par-
ticular, this paper makes the following technical contributions. First, we formulate
the distributed overset grid assembly problem and present its challenges. Second,
we present techniques that can handle both 2-D and 3-D, structured, unstructured,
or mixed element, distributed, overset grids. Finally, we present preliminary perfor-
mance results using a Wing-Store Separation configuration.
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