A novel approach of three-dimensional hybrid grid methodology: Part 1. Grid generation

Zheng, Yao; Liou, Meng-Sing

doi:10.1016/s0045-7825(03)00385-2

Cited by 37 publications

(16 citation statements)

References 42 publications

(71 reference statements)

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“…In the two rows of near-boundary cells of each of the overlapping or overset grids, the parameters are determined at linear interpolation [15,16] in the manner, as done in [13] . In [15] , it is shown that this approach is equivalent to the application of adaptive unstructured grids, but its computational resources are substantially less, i.e., it is more efficient.…”

Section: Cfd Codes Computation Methodologymentioning

confidence: 99%

“…Fully unstructured grids are poorly adapted to condense mesh nodes in the vicinity of walls; the computational accuracy of these grids according to high-order schemes is lower than that according to structured grids. At the same time, it should be noted that some interesting tasks of aeromechanics are characterized by the presence of multiply connected computational subdomains, for example, flow around the profile with vortex cells [4,5] , with trailing-edge flaps, and leading-edge flaps [12,13] , flow interactions with a cylinder in a perforated housing when air from a high-pressure zone flows into a low-pressure zone in the wake [14] . In the case of complex flow boundary configurations, the use of single-block (with one matrix) structured grids runs into difficulties; therefore, multiblock overlapping grids have been long used.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation and experiments on turbulent air flow around the semi-circular profile at zero angle of attack and moderate Reynolds number

et al. 2019

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Two-dimensional flow around a semi-circular profile at the zero angle of attack and at Re = 50000 on the self-oscillatory period is extensively studied by the URANS method involving the standard semi-empirical SST turbulence models, the SST turbulence model with the correction for streamline curvature modified within the Rodi-Leschziner-Isaev and Smirnov-Menter approaches, as well as involving Hanjalic's four-parameter eddy viscosity elliptic relaxation model and its analog-eddy viscosity elliptic blending model proposed in the present work. This has been done with the use of different-structure grids (multiblock with structured overlapping and unstructured composite). Different numerical approximation methods realized in six codes (VP2/3, SigmaFlow, Fluent, CFX, OpenFOAM, and StarCCM+) are used. An underestimation (up to 30%) of time-averaged integral aerodynamic loads is revealed by means of the standard near-wall SST model. This is explained by the high vortex viscosity production in the profile wake. Wind tunnel tests show that the location of cutoff washers on the semi-circular profile provides a quasi-two-dimensional flow around it and allows applying measurement data to verify two-dimensional turbulent flow. The best agreement of experimental results and numerical predictions when comparing the Strouhal number and time-averaged surface pressure coefficient distributions is achieved using both the modified SST model with the correction for streamline curvature and the modified eddy viscosity elliptic blending model. When the SST model with the correction for streamline curvature, modified within the Rodi-Leschziner-Isaev, Smirnov-Menter and Durbin approaches, is used, all the above codes yield close predictions of a vertical aerodynamic load on the oscillation period.

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Section: Cfd Codes Computation Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation and experiments on turbulent air flow around the semi-circular profile at zero angle of attack and moderate Reynolds number

et al. 2019

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“…The main idea of the Chimera method is to generate independent meshes for the components present in the computational domain (e.g., fuselage, airfoil, flap, and slap) and to couple them via a coupling strategy in order to obtain a global solution. The appealing characteristics of the Chimera method has enabled many applications, summarized in the following: Simplified mesh generation . At the time when mesh generators could not handle complex geometries, the Chimera method was proposed as an alternative.…”

Section: Introductionmentioning

confidence: 99%

A Chimera method for the incompressible Navier–Stokes equations

Houzeaux

Eguzkitza

Aubry

et al. 2014

Numerical Methods in Fluids

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SUMMARYThe Chimera method was developed three decades ago as a meshing simplification tool. Different components are meshed independently and then glued together using a domain decomposition technique to couple the equations solved on each component. This coupling is achieved via transmission conditions (in the finite element context) or by imposing the continuity of fluxes (in the finite volume context). Historically, the method has then been used extensively to treat moving objects, as the independent meshes are free to move with respect to the others. At each time step, the main task consists in recomputing the interpolation of the transmission conditions or fluxes. This paper presents a Chimera method applied to the Navier-Stokes equations. After an introduction on the Chimera method, we describe in two different sections the two independent steps of the method: the hole cutting to create the interfaces of the subdomains, and the coupling of the subdomains. Then we present the Navier-Stokes solver considered in this work. Implementation aspects are then detailed in order to apply efficiently the method to this specific parallel Navier-Stokes solver. We conclude with some examples to demonstrate the reliability and the application of the proposed method.

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“…In some studies, it has been suggested to first fill an axis-aligned Cartesian mesh in the far field of viscous walls and then connect the boundary layer mesh and the Cartesian mesh with a few transition layers of unstructured elements [12][13][14][15].…”

mentioning

confidence: 99%

Hybrid Grid Generation for Viscous Flow Simulations in Complex Geometries

Liu

Chen

et al. 2020

Preprint

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In this paper, we present a hybrid grid generation approach for viscous flow simulations by marching a surface triangulation on viscous walls along certain directions. Focuses are on the computing strategies used to determine the marching directions and distances since these strategies determine the quality of the resulting elements and the reliability of the meshing procedure to a large extent. With respect to marching direction, three strategies featured with different levels of efficiencies and robustness performance are combined to compute the initial normals at front nodes to balance the trade-off between efficiency and robustness. A novel weighted strategy is used in the normal smoothing scheme, which evidently reduce the possibility of early stop of front generation at complex corners. With respect to marching distances, the distance settings at concave and/or convex corners are locally adjusted to smooth the front shape at first; a further adjustment is then conducted for front nodes in the neighbourhood of gaps between opposite viscous boundaries. These efforts, plus other special treatments such as multi-normal generation and fast detection of local/global intersection, as a whole enable the setup of a hybrid mesher that could generate qualitied viscous grids for geometries with industry-level complexities.

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A novel approach of three-dimensional hybrid grid methodology: Part 1. Grid generation

Cited by 37 publications

References 42 publications

Numerical simulation and experiments on turbulent air flow around the semi-circular profile at zero angle of attack and moderate Reynolds number

Numerical simulation and experiments on turbulent air flow around the semi-circular profile at zero angle of attack and moderate Reynolds number

A Chimera method for the incompressible Navier–Stokes equations

Hybrid Grid Generation for Viscous Flow Simulations in Complex Geometries

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