Robust and efficient overset grid assembly for partitioned unstructured meshes

Roget, Beatrice; Sitaraman, Jayanarayanan

doi:10.1016/j.jcp.2013.12.021

Cited by 68 publications

(47 citation statements)

References 9 publications

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“…The difficulties associated with applying this approach to complex geometries with small features can be removed 7 by using additional information and data structures in addition to the approximate geometry. In PUNDIT [24,28], an approximate map back to the grid's elements is included in the approximate geometry, leading to a fast search method for performing donor/receptor point connectivity as well as sidestepping the limitations of the approximate geometry representation. The last class of automatic hole-cutting methods are direct cut methods, in which the boundary surfaces of the grids are used directly to 'cut' the connectivity of the other grids and remove all cells within them.…”

Section: Review Of Connectivity Methodsmentioning

confidence: 99%

A parallel direct cut algorithm for high-order overset methods with application to a spinning golf ball

Crabill

Witherden

Jameson

2018

Journal of Computational Physics

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Overset methods are commonly employed to enable the effective simulation of problems involving complex geometries and moving objects such as rotorcraft. This paper presents a novel overset domain connectivity algorithm based upon the direct cut approach suitable for use with GPU-accelerated solvers on high-order curved grids. In contrast to previous methods it is capable of exploiting the highly data-parallel nature of modern accelerators. Further, the approach is also substantially more efficient at handling the curved grids which arise within the context of high-order methods. An implementation of this new algorithm is presented and combined with a high-order fluid dynamics code. The algorithm is validated against several benchmark problems, including flow over a spinning golf ball at a Reynolds number of 150,000.problems of engineering interest, including entire rotorcraft configurations with relative motion between one or more rotors in addition to a fixed fuselage.One of the many advantages of this approach, compared with say deforming grids, is that it is possible to employ multiple solvers: an unstructured near-body solver to allow for easier mesh generation around each body, and a high-order Cartesian off-body solver with adaptive mesh refinement (AMR) for speed and simplicity. In most production codes used for complex geometries, such as the CREATE-AV HELIOS software [2], the near-body solvers are typically 2nd or 3rd order accurate in space. Higherorder near-body solvers are available, but only for (multi-block) structured grids currently, such as with the OVERFLOW code using 5th order accurate finite differences [3,4]. For the best possible performance, accuracy, and applicability to a wide range of complex geometries, however, a higherorder unstructured near-body solver is preferable. As shown by Wissink [5] and by Nastase et al. [6], without a high-order near body solver, vortical structures and other flow features incur high amounts of diffusion before (or while) passing into the high-order off-body solver, causing a large increase in error.High order methods have a number of attractive attributes. Not only are they less dissipative, enabling the simulation of vortex-dominated flows with fewer degrees of freedom than a lower-order method, but they have also been shown to give remarkably good results when used to perform implicit large eddy simulations (ILES) and direct numerical simulations (DNS) [7,8]. Popular examples of high-order schemes for unstructured grids include the discontinuous Galerkin finite element method, first introduced by Reed and Hill [9], and spectral difference (SD) methods originally proposed under the moniker 'staggered-grid Chebyshev multidomain methods' by Kopriva and Kolias in 1996 [10] and later popularized by Sun et al. [11]. In 2007 Huynh proposed the flux reconstruction (FR) approach [12]; a unifying framework for high-order schemes for unstructured grids that encompasses both the nodal DG schemes of Hesthaven and Warburton [13] and, at least for a linear flux functi...

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Section: Review Of Connectivity Methodsmentioning

confidence: 99%

A parallel direct cut algorithm for high-order overset methods with application to a spinning golf ball

Crabill

Witherden

Jameson

2018

Journal of Computational Physics

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“…Values on the fringe cells are obtained from the interpolation of the donors. The interpolation stencils are generated with aid of the inverse distance weighting scheme, see [18]. Any flow variable ϕ at a fringe cell can be expressed as (see [19]…”

Section: Overset Methodsmentioning

confidence: 99%

On Application of Overset/Chimera Method for Flow Approximation Over a Vibrating Body Using Openfoam

Winter¹,

Sváček²

2018

Topical Problems of Fluid Mechanics 2018

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The subject of this contribution is the numerical simulation of fluid-structure interaction problems with aid of overset method. The numerical simulation is based on the finite volume method and the arbitrary Lagrangian Eulerian method is used. Numerical results obtained by the open-source code OpenFOAM for approximation of the flow around both static and oscillating circular cylinder and oscillating NACA 0012 profile are shown.

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“…This kind of problems is termed as dynamic mesh problems in unsteady calculations. So far various kinds of dynamic mesh approaches [3,[5][6][7][8] have been proposed and validated.…”

Section: Introductionmentioning

confidence: 99%

“…The first class refers to the overset grid technique [7,[9][10][11][12] in which mesh movements can be modeled independently for the involved boundary that is supposed to be moved. The meshes of different moving parts overlap with each other to form the complete overset grid system.…”

Section: Introductionmentioning

confidence: 99%

“…This technique, applied in both structured [10,11] and unstructured [7] grids, alleviates the complexity of mesh generation and improves the mesh quality of local domains. However, it adds the difficulty of the mesh preprocessing work [7,9,11,13] in which the interpolated information of each pair of overlapped meshblock needs to be determined from each one. An alternative category, termed as deforming mesh technique, is about using single, consistent mesh and deforming it to conform the new geometric shape without changing the connectivity of the whole computational mesh.…”

Section: Introductionmentioning

confidence: 99%

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Parallelization of an Unsteady ALE Solver with Deforming Mesh Using OpenACC

Yuan

et al. 2017

Scientific Programming

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This paper presents a parallel, GPU-based, deforming mesh-enabled unsteady numerical solver for solving moving body problems by using OpenACC. Both the 2D and 3D parallel algorithms based on spring-like deforming mesh methods are proposed and then implemented through OpenACC programming model. Furthermore, these algorithms are coupled with an unstructured mesh based, implicit time scheme integrated numerical solver, which makes the full GPU version of the solver capable of handling unsteady calculations with deforming mesh. Experiments results show that the proposed parallel deforming mesh algorithm can achieve over 2.5x speedup on K20 GPU card in comparison with 20 OpenMP threads on Intel E5-2658 V2 CPU cores. And both 2D and 3D cases are conducted to validate the efficiency, correctness, and accuracy of the present solver.

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Robust and efficient overset grid assembly for partitioned unstructured meshes

Cited by 68 publications

References 9 publications

A parallel direct cut algorithm for high-order overset methods with application to a spinning golf ball

A parallel direct cut algorithm for high-order overset methods with application to a spinning golf ball

On Application of Overset/Chimera Method for Flow Approximation Over a Vibrating Body Using Openfoam

Parallelization of an Unsteady ALE Solver with Deforming Mesh Using OpenACC

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