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Solving Difficult Grid Related Problems Utilizing the Volume Grid Manipulator
Alter, Stephen J.
Proceedings, 7th International Meshing Roundtable, Sandia National Lab, pp.35-57, October 1998
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INTERNATIONAL MESHING ROUNTABLE
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7th International Meshing Roundtable
October 26-28, 1998
Dearborn, Michigan, USA
Lockheed Martin Engineering and Sciences
Hampton, Virginia 23681
e-mail: s.j.alterlarc.nasa.gov
Abstract
This article presents a set of methods to solve difficult problems in
grid generation as related to Computational Fluid Dynamics (CED).
Throughout the evolution of a CFD simulation, modification of existing
volume grids may be required to improve flow domain capture, resolve
characteristic gradients, and enhance the accuracy of computed
aerodynamic and thermodynamic parameters. The processes identified in
this paper make extensive use of the Volume Grid Manipulator (VGM)
multi-purpose grid manipulation code which contains an interpretor
style language. The VGM software enables the build up of simple
processes, or manipulations, to develop complex techniques that can be
used to solve a wide variety of grid related problems. The VGM code
also provides a user friendly environment for the solution of difficult
grid related problems. Coupling the rich command language with the
journaling or script generation capability afforded by the VGM code,
enables the use of complex solution techniques to solve a variety of
grid problems as well as provide quick turnaround. To demonstrate the
powerful manipulative capabilities of the VGM code, a volume grid of a
simple shape with multiple flow features will be adapted, a wake volume
grid will be appended to a volume grid of an X33 Venturestar, and the
volume grid of another X33 Venturestar will be expanded to ensure flow
capture while removing negative volume cells.
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