Development and implementation of Gridgen's hyperbolic PDE and extrusion methods

Steinbrenner, John P.; Wyman, Nick; Chawner, John R.

doi:10.2514/6.2000-679

Cited by 19 publications

(6 citation statements)

References 1 publication

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“…Unlike the structured grid, the hybrid grid topology was easy to construct and automate. The boundary layer was constructed using a normal hyperbolic extrusion technique in Pointwise [26]. The user need only to specify the initial cell height, growth rate, and the number of layers for the extrusion.…”

Section: Structured and Hybridmentioning

confidence: 99%

Aerodynamic Shape Optimization of a Vertical-Axis Wind Turbine Using Differential Evolution

Carrigan

Dennis

Han

et al. 2012

ISRN Renewable Energy

100

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The purpose of this study is to introduce and demonstrate a fully automated process for optimizing the airfoil cross-section of a vertical-axis wind turbine (VAWT). The objective is to maximize the torque while enforcing typical wind turbine design constraints such as tip speed ratio, solidity, and blade profile. By fixing the tip speed ratio of the wind turbine, there exists an airfoil crosssection and solidity for which the torque can be maximized, requiring the development of an iterative design system. The design system required to maximize torque incorporates rapid geometry generation and automated hybrid mesh generation tools with viscous, unsteady computational fluid dynamics (CFD) simulation software. The flexibility and automation of the modular design and simulation system allows for it to easily be coupled with a parallel differential evolution algorithm used to obtain an optimized blade design that maximizes the efficiency of the wind turbine.

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Section: Structured and Hybridmentioning

confidence: 99%

Aerodynamic Shape Optimization of a Vertical-Axis Wind Turbine Using Differential Evolution

Carrigan

Dennis

Han

et al. 2012

ISRN Renewable Energy

100

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“…Some initial calculations for the two-dimensional data have been performed using a commercially available grid generation tool, 28 GRIDGEN, and a publicly available CFD code, 29 ARC2D. Modifications to the ARC2D code make it attractive in the evaluation of flowfields about ice shape profiles.…”

Section: Aerodynamic Analysis Of Ice Shape Profiles With Cfdmentioning

confidence: 99%

Airfoil Ice-Accretion Aerodynamic Simulation

Bragg

Broeren

Addy

et al. 2007

45th AIAA Aerospace Sciences Meeting and Exhibit

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are conducting a major research program whose goal is to improve our understanding of the aerodynamic scaling of ice accretions on airfoils. The program when it is completed will result in validated scaled simulation methods that produce the essential aerodynamic features of the full-scale iced-airfoil. This research will provide some of the first, high-fidelity, full-scale, iced-airfoil aerodynamic data. An initial study classified ice accretions based on their aerodynamics into four types: roughness, streamwise ice, horn ice, and spanwise-ridge ice. Subscale testing using a NACA 23012 airfoil was performed in the NASA IRT and University of Illinois wind tunnel to better understand the aerodynamics of these ice types and to test various levels of ice simulation fidelity. These studies are briefly reviewed here and have been presented in more detail in other papers. Based on these results, full-scale testing at the ONERA F1 tunnel using cast ice shapes obtained from molds taken in the IRT will provide full-scale iced airfoil data from full-scale ice accretions. Using these data as a baseline, the final step is to validate the simulation methods in scale in the Illinois wind tunnel. Computational ice accretion methods including LEWICE and ONICE have been used to guide the experiments and are briefly described and results shown. When full-scale and simulation aerodynamic results are available, these data will be used to further develop computational tools. Thus the purpose of the paper is to present an overview of the program and key results to date.

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“…This automated assembly step is built upon a lower-level interface in Gridgen that is used for a variety of purposes other than closed surface assembly. These purposes include the agglomeration of multiple surface meshes into a single mesh, the assembly of surface meshes into the six faces of a structured block, and the assembly of structured and unstructured surface meshes to be extruded into hexahedral and prismatic volume meshes [19].…”

Section: Interactive Proceduresmentioning

confidence: 99%

Procedural CAD Model Edge Tolerance Negotiation for Surface Meshing

Steinbrenner

Wyman

Chawner

2001

EWC

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Geometrical models output from CAD software often require modification before they may be used for analysis-quality mesh generation. This is due primarily to the inconsistencies in tolerances used by the CAD operator and the tolerances required for analysis. This paper presents a method for construction of watertight surface meshes directly on imperfect non-modified CAD models. The method is based on a hierarchical grid topology structure that defines a surface mesh by a grid and a collection of curves defining the boundary. Curve boundaries on component surfaces are iteratively split and merged according to user-set tolerances, allowing adjacent surface meshes to become computationally watertight via their shared edge curves. The collection of watertight surface meshes may then be made model-independent through interactive agglomeration of the surface meshes, followed by refinement and decimation sweeps to remove artifacts of original surface edges. Interactive procedures used for difficult cases are also explained, as are ongoing efforts for further automation.

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Development and implementation of Gridgen's hyperbolic PDE and extrusion methods

Cited by 19 publications

References 1 publication

Aerodynamic Shape Optimization of a Vertical-Axis Wind Turbine Using Differential Evolution

Aerodynamic Shape Optimization of a Vertical-Axis Wind Turbine Using Differential Evolution

Airfoil Ice-Accretion Aerodynamic Simulation

Procedural CAD Model Edge Tolerance Negotiation for Surface Meshing

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