Intergrid-boundary definition method for overset unstructured grid approach

Nakahashi, Kazuhiro; Togashi, Fumiya; Sharov, Dmitri

doi:10.2514/3.14652

Cited by 6 publications

(6 citation statements)

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“…One thing that has to be taken into consideration is that the grids in a higher layer are usually finer than those grids in a lower layer for the sake of resolving the flow structure in the near‐field region; hence, they are expected to be retained for the computation. In the present study, the overset grid uses the wall distance to define the activity of the points and thus provides the appropriate resolution to the local situation. The minimum self‐wall distances from each grid node to the wall boundaries in its own cluster are first measured.…”

Section: Dynamic Deforming Overset Gridmentioning

confidence: 99%

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A dynamic mesh strategy applied to the simulation of flapping wings

Deng

Xiao

Oudheusden

et al. 2016

Numerical Meth Engineering

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SUMMARYA robust and efficient dynamic grid strategy based on an overset grid coupled with mesh deformation technique is proposed for simulating unsteady flow of flapping wings undergoing large geometrical displacement. The dynamic grid method was implemented using a hierarchical unstructured overset grid locally coupled with a fast radial basis function (RBF)-based mapping approach. The hierarchically organized overset grid allows transferring the grid resolution for multiple blocks and overlapping/embedding the meshes. The RBF-based mapping approach is particularly highlighted in this paper in view of its considerable computational efficiency compared with conventional RBF evaluation. The performance of the proposed dynamic mesh strategy is demonstrated by three typical unsteady cases, including a rotating rectangular block in a fixed domain, a relative movement between self-propelled fishes and the X-wing type flapping-wing micro air vehicle DelFly, which displays the clap-and-fling wing-interaction phenomenon on both sides of the fuselage. Results show that the proposed method can be applied to the simulation of flapping wings with satisfactory efficiency and robustness.

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Section: Dynamic Deforming Overset Gridmentioning

confidence: 99%

“… and subsequently extended by Nakahashi et al . for applications on unstructured grids. By hole‐cutting and interpolation in overlapping mesh regions, the grid intersection can in principle be avoided.…”

Section: Introductionmentioning

confidence: 99%

A dynamic mesh strategy applied to the simulation of flapping wings

Deng

Xiao

Oudheusden

et al. 2016

Numerical Meth Engineering

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“…Such regions are typically interiors of solid bodies, where cells have to be blanked in those overlapping grid blocks, where the solid body is not meshed. Many blanking methods have been proposed (Nakahashi et al, 2000). All of these methods work, but they have some restrictions such as requiring a moderate to high degree of user input, which can be difficult and/or time-consuming to provide.…”

Section: Modeling Non-matching Interfaces Through Hybrid Interpolationmentioning

confidence: 99%

Advanced numerical methods for uncertainty reduction when predicting heat exchanger dynamic stability limits: Review and perspectives

Longatte¹,

Baj²,

Hoarau³

et al. 2013

Nuclear Engineering and Design

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“…A significant enhancement to this approach has been developed and applied to unstructured grids. 10 The donor search is again used to find the element containing the point to be classified. All the nodes in the grids also have stored the minimum distance to their parent boundary.…”

Section: A Search Basedmentioning

confidence: 99%

A Direct Cut Approach for Overset Hole Cutting

Noack

2007

18th AIAA Computational Fluid Dynamics Conference

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The overset, or chimera, grid methodology utilizes a set of overlapping grids to discretize the solution domain. The critical first step in the overset process is the hole cutting with many different approaches currently in use. The present paper investigates an approach that seeks to maximize automation and minimize user inputs. The method uses the surfaces of the grids that define geometry for the hole cutting and will cut a minimal hole, which is required for geometries with small gaps between geometry components. The method is demonstrated for two-and three-dimensional cases. The present procedure is found to be effective in cutting minimal holes around complex geometries including small gap regions.

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Intergrid-boundary definition method for overset unstructured grid approach

Cited by 6 publications

References 0 publications

A dynamic mesh strategy applied to the simulation of flapping wings

A dynamic mesh strategy applied to the simulation of flapping wings

Advanced numerical methods for uncertainty reduction when predicting heat exchanger dynamic stability limits: Review and perspectives

A Direct Cut Approach for Overset Hole Cutting

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