A computational study focusing on grid topology and solver algorithms was performed for M_∞ = 2.0 flow over a wall-mounted two-dimensional cylinder with the structured overset-grid GFD code OVERFLOW. Previous work had focused on single-grid solutions to this problem using the 5th-order WENO scheme in OVERFLOW along with an implicit large eddy simulation (ILES) approach with the incoming boundary layer tripped using a backwards wall-jet boundary condition. In the earlier work, a considerable amount of distortion was observed around the shocks, which was thought to be caused by some combination of solver parameters and/or grid-shock misalignment. In the current study, different solver settings are employed on the single-grid topology to see if these distortions can be reduced/eliminated. Multiple overset-grid systems are also employed, including a "standard" overset topology with a cylindrical body-fitted grid embedded within a Cartesian background grid, and a more complex overset system with multiple overlapping grids used to provide better resolution and grid/shock alignment. Overset grid technology is an important enabling capability for high-order ILES simulations on more complex configurations, and thus the impact of the use of overset grids is studied through comparison to single-grid results.
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