Automated Preprocessing Tools for Use with a High-Order Overset-Grid Algorithm

Sherer, Scott E.; Visbal, Miguel R.; Galbraith, Marshall C.

doi:10.2514/6.2006-1147

Cited by 37 publications

(15 citation statements)

References 24 publications

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“…Details about the individual grids are given in table 2 where grid 1 is used to hold the turbulent boundary layer while grids 2-4 are primarily to represent the circular orifice and its backing cavity. The individual grids are relatively simple to generate while their interpolation data was determined using a NASA-developed pre-processing tool (Suhs, Rogers & Dietz 2003) coupled to one developed at the Air Force Research Laboratory to produce sixth-order interpolation stencils (Sherer, Visbal & Galbraith 2006). The minimum grid spacing in the orifice is r min = 0.0075d at the orifice walls.…”

Section: Grid Designmentioning

confidence: 99%

Numerical investigation of a honeycomb liner grazed by laminar and turbulent boundary layers

Zhang

Bodony

2016

J. Fluid Mech.

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Direct numerical simulations are used to study the interaction of a cavity-backed circular orifice with grazing laminar and turbulent boundary layers and incident sound waves. The flow conditions and geometry are representative of single degree-of-freedom acoustic liners applied in the inlet and exhaust ducts of aircraft engines and are the same as those from experiments conducted at NASA Langley. The simulations identify the fluid mechanics of how the sound field and state of the grazing boundary layer impact the in-orifice flow and suggest a simple flow analogy that enables scaling estimates. From the scaling estimates the simulations are then used to develop reduced-order models for the in-orifice flow and a time-domain impedance model is constructed. The liner is found to increase drag at all conditions studied by an amount that increases with the incident sound pressure amplitude.

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Section: Grid Designmentioning

confidence: 99%

Numerical investigation of a honeycomb liner grazed by laminar and turbulent boundary layers

Zhang

Bodony

2016

J. Fluid Mech.

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“…The additional fringe points increase the possibility of the grid system having orphan points. The larger stencils can also cause significant complications when performing hole cutting and grid partitioning for parallel calculations [20]. Furthermore, the high-order schemes need to be paired with interpolation schemes of equal order [21].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the high-order schemes need to be paired with interpolation schemes of equal order [21]. These high-order interpolation schemes also require large stencils, which can complicate the generation of meshes with appropriate overlapping regions that do not generate orphan points [20].…”

Section: Introductionmentioning

confidence: 99%

A Discontinuous Galerkin Chimera scheme

et al. 2014

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a b s t r a c tThe Chimera overset method is a powerful technique for modeling fluid flow associated with complex engineering problems using structured meshes. The use of structured meshes has enabled engineers to employ a number of high-order schemes, such as the WENO and compact differencing schemes. However, the large stencil associated with these schemes can significantly complicate the inter-grid communication scheme and hole cutting procedures. This paper demonstrates a methodology for using the Discontinuous Galerkin (DG) scheme with Chimera overset meshes. The small stencil of the DG scheme makes it particularly suitable for Chimera meshes as it simplifies the inter-grid communication scheme as well as hole cutting procedures. The DG-Chimera scheme does not require a donor interpolation method with a large stencil because the DG scheme represents the solution as cell local polynomials. The DG-Chimera method also does not require the use of fringe points to maintain the interior stencil across inter-grid boundaries. Thus, inter-grid communication can be established as long as the receiving boundary is enclosed by or abuts the donor mesh. This makes the inter-grid communication procedure applicable to both Chimera and zonal meshes. Details of the DG-Chimera scheme are presented, and the method is demonstrated on a set of two-dimensional inviscid flow problems.Published by Elsevier Ltd.

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“…In addition, the high-order schemes need to be paired with interpolation schemes of equal order [11], which also require large stencils. These large stencils can complicate the construction of meshes with appropriate and adequate overlapping regions that do not contain orphan points [12]. This is particularly true for meshes with holes.…”

Section: Introductionmentioning

confidence: 99%