Comparison of Fixed and Adaptive Unstructured Grid Results for Drag Prediction Workshop 6

Michal, Todd; Babcock, Deric; Kamenetskiy, Dmitry S.; Krakos, Joshua A.; Mani, Mori; Glasby, Ryan S.; Erwin, Taylor; Stefanski, Douglas L.

doi:10.2514/1.c034491

Cited by 14 publications

(5 citation statements)

References 27 publications

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“…Documenting the impact of discretization on a series of unstructured adaptive grids from the same trajectory could help to define improved metric or grid requirements. If orthogonality is shown to be critical, Michal et al [47] inserted a semistructured prismatic boundary layer and Loseille [30] provides a method that encourages metric-orthogonal elements. More research is required to definitively show the impacts of orthogonality in the context of adaptive grid methods.…”

Section: Discussionmentioning

confidence: 99%

Unstructured Grid Adaptation and Solver Technology for Turbulent Flows

Park

Barral

Ibanez

et al. 2018

2018 AIAA Aerospace Sciences Meeting

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Unstructured grid adaptation is a tool to control Computational Fluid Dynamics (CFD) discretization error. However, adaptive grid techniques have made limited impact on production analysis workflows where the control of discretization error is critical to obtaining reliable simulation results. Issues that prevent the use of adaptive grid methods are identified by applying unstructured grid adaptation methods to a series of benchmark cases. Once identified, these challenges to existing adaptive workflows can be addressed. Unstructured grid adaptation is evaluated for test cases described on the Turbulence Modeling Resource (TMR) web site, which documents uniform grid refinement of multiple schemes. The cases are turbulent flow over a Hemisphere Cylinder and an ONERA M6 Wing. Adaptive grid force and moment trajectories are shown for three integrated grid adaptation processes with Mach interpolation control and output error based metrics. The integrated grid adaptation process with a finite element (FE) discretization produced results consistent with uniform grid refinement of fixed grids. The integrated grid adaptation processes with finite volume schemes were slower to converge to the reference solution than the FE method. Metric conformity is documented on grid/metric snapshots for five grid adaptation mechanics implementations. These tools produce anisotropic boundary conforming grids requested by the adaptation process.

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Section: Discussionmentioning

confidence: 99%

Unstructured Grid Adaptation and Solver Technology for Turbulent Flows

Park

Barral

Ibanez

et al. 2018

2018 AIAA Aerospace Sciences Meeting

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“…Such treatments can introduce numerical errors while not being readily available in standard flow solvers. Additionally, a number of remeshing software using a metricbased strategy, based on the Delaunay method [15,16,17,18,19,20,21,22], are available, often under open-source licensing. In metric-based mesh adaptation a new mesh is generated for the entire computational domain.…”

Section: Introductionmentioning

confidence: 99%

Unstructured h- and hp-adaptive strategies for discontinuous Galerkin methods based on a posteriori error estimation for compressible flows

et al. 2022

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“…Among the available mesh adaptation softwares using a metric-based strategy, based on the Delaunay method [37][38][39][40][41][42][43], MMG is a remeshing library developed by Bordeaux INP, CNRS, Sorbonne Université and INRIA [22,44]. The MMG software, supporting both 2D and 3D remeshing (MMG2D and MMG3D) has been chosen in this work, relying on primitive operators like edge splitting, edge collapsing, edge swapping, and node relocation.…”

Section: Introductionmentioning

confidence: 99%

A high-order h-adaptive discontinuous Galerkin method for unstructured grids based on a posteriori error estimation.

Basile¹,

Chapelier²,

Plata³

et al. 2021

AIAA Scitech 2021 Forum

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In this paper, we present a mesh h-adaptation strategy suited for the discontinuous Galerkin formulation of the compressible Navier-Stokes equations on unstructured grids, based on the simplicial remeshing library MMG. A novel a posteriori error estimator, combining the measure of the energy associated with the highest-order modes and the inter-element jumps, is used to build the metric field. The performance of the developed mesh adaptation algorithm is assessed for steady laminar viscous flows past a square cylinder and past a NACA0012 airfoil, and for the unsteady laminar viscous flow past a circular cylinder. The gain in accuracy for a given number of degrees of freedom (DoFs) is demonstrated for = 1, = 2 and = 3 polynomial degrees, with respect to uniformly refined simulations.

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Comparison of Fixed and Adaptive Unstructured Grid Results for Drag Prediction Workshop 6

Cited by 14 publications

References 27 publications

Unstructured Grid Adaptation and Solver Technology for Turbulent Flows

Unstructured Grid Adaptation and Solver Technology for Turbulent Flows

Unstructured h- and hp-adaptive strategies for discontinuous Galerkin methods based on a posteriori error estimation for compressible flows

A high-order h-adaptive discontinuous Galerkin method for unstructured grids based on a posteriori error estimation.

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