Variable high-order multiblock overlapping grid methods for mixed steady and unsteady multiscale viscous flows, part II: hypersonic nonequilibrium flows

Lani, Andrea; Sjögreen, Björn; Yee, H. C.; Henshaw, William D.

doi:10.2514/6.2011-3140

Cited by 5 publications

(6 citation statements)

References 17 publications

(15 reference statements)

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“…Overset grid methods have been widely used for problems with moving geometries. They were recognised early on to be a useful technique for treating rigid moving bodies, such as aircraft store separation [19], and have subsequently been applied to many other moving-grid aerodynamic applications, see for example [15,16,31,33,46,49,75]. English et al [20] present a novel overset grid approach using a Voronoi grid to link Cartesian overset grids.…”

Section: Kempe and Fröhlichmentioning

confidence: 99%

Direct numerical simulation of particulate flows with an overset grid method

Koblitz

Lovett

Nikiforakis

et al. 2017

Journal of Computational Physics

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We evaluate an efficient overset grid method for two-dimensional and three-dimensional particulate flows for small numbers of particles at finite Reynolds number. The rigid particles are discretised using moving overset grids overlaid on a Cartesian background grid. This allows for stronglyenforced boundary conditions and local grid refinement at particle surfaces, thereby accurately capturing the viscous boundary layer at modest computational cost. The incompressible Navier-Stokes equations are solved with a fractional-step scheme which is second-order-accurate in space and time, while the fluid-solid coupling is achieved with a partitioned approach including multiple sub-iterations to increase stability for light, rigid bodies. Through a series of benchmark studies we demonstrate the accuracy and efficiency of this approach compared to other boundary conformal and static grid methods in the literature. In particular, we find that fully resolving boundary layers at particle surfaces is crucial to obtain accurate solutions to many common test cases. With our approach we are able to compute accurate solutions using as little as one third the number of grid points as uniform grid computations in the literature. A detailed convergence study shows a 13-fold decrease in CPU time over a uniform grid test case whilst maintaining comparable solution accuracy.

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Section: Kempe and Fröhlichmentioning

confidence: 99%

Direct numerical simulation of particulate flows with an overset grid method

Koblitz

Lovett

Nikiforakis

et al. 2017

Journal of Computational Physics

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“…This case has already been used to evaluate overset grid method, e.g. in [36]. The flow is here simplified to a monospecies fluid.…”

Section: Analysis Of the Overset Grid Methods For A Strong Shockmentioning

confidence: 99%

“…This is even more critical in compressible LES since the resolved vortical, acoustic and entropic waves must accurately cross the overlapping interface. That is the reason why highorder overset grid methods have been recently developed for structured grids, for steady or moving interfaces [25,[32][33][34][35][36]. High-order discontinuous numerical methods, such as Discontinuous Galerkin, Flux Reconstruction and Spectral methods, have recently emerged in the CFD community, and dedicated high-order overset grid techniques had to be developed to preserve accuracy properties of such methods, e.g.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of a high-order unstructured overset grid method for compressible LES of turbomachinery

Laborderie

Duchaine

Gicquel

et al. 2018

Journal of Computational Physics

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Large-Eddy Simulation (LES) is recognized as a promising method for highfidelity flow predictions in turbomachinery applications. The presented approach consists of the coupling of several instances of the same LES unstructured solver through an overset grid method. A high-order interpolation, implemented within this coupling method, is introduced and evaluated on several test cases. It is shown to be third order accurate, to preserve the accuracy of various second and third order convective schemes and to ensure the continuity of di↵usive fluxes and subgrid scale tensors even in detrimental interface configurations. In this analysis, three types of spurious waves generated at the interface are identified. They are significantly reduced by the high-order interpolation at the interface. The latter having the same cost as the original lower order method, the high-order overset grid method appears as a promising alternative to be used in all the applications.

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“…All the computations employ the multi-dimensional high order single/overset grid nonequilibrium code ADPDIS3D [37,38]. 1D and 2D simplifications of the 3D EAST problem are considered using a single block option in the code.…”

Section: Numerical Simulationmentioning

confidence: 99%