Simple multiple reference frame for high-order solution of hovering rotors with and without ground effect

Silva, Paulo Augusto Strobel Freitas; Tsoutsanis, Panagiotis; Antoniadis, Antonis F.

doi:10.1016/j.ast.2021.106518

Cited by 34 publications

(22 citation statements)

References 45 publications

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“…The present polynomial reconstruction is based upon the approaches of [53,63], that have been applied to smooth and discontinuous flow problems [2][3][4][5]20,46,49,50,57,[59][60][61][62][64][65][66][67], and only the key-components will be presented herein and the reader is referred to [53,63] for further details. For the reconstruction, a transformation from physical space to a reference space as introduced by Dumbser et al [16,17] is employed to reduce the scaling effects that occur at unstructured meshes consisting of elements of different shape and size.…”

Section: Reconstructionmentioning

confidence: 99%

CWENO Finite-Volume Interface Capturing Schemes for Multicomponent Flows Using Unstructured Meshes

et al. 2021

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In this paper we extend the application of unstructured high-order finite-volume central-weighted essentially non-oscillatory (CWENO) schemes to multicomponent flows using the interface capturing paradigm. The developed method achieves high-order accurate solution in smooth regions, while providing oscillation free solutions at discontinuous regions. The schemes are inherently compact in the sense that the central stencils employed are as compact as possible, and that the directional stencils are reduced in size, therefore simplifying their implementation. Several parameters that influence the performance of the schemes are investigated, such as reconstruction variables and their reconstruction order. The performance of the schemes is assessed under a series of stringent test problems consisting of various combinations of gases and liquids, and compared against analytical solutions, computational and experimental results available in the literature. The results obtained demonstrate the robustness of the new schemes for several applications, as well as their limitations within the present interface-capturing implementation.

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Section: Reconstructionmentioning

confidence: 99%

CWENO Finite-Volume Interface Capturing Schemes for Multicomponent Flows Using Unstructured Meshes

et al. 2021

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“…Figure 4 demonstrates the dependence of the main rotor thrust ratio on the ground effect c T /c T∞ (H/R). The obtained result has been compared with the available experimental and calculated data [1], [9], [12], [13], [17], [19], [22], [23], [26] (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

“…In order to solve such problems, the Unsteady RANS (Reynolds Averaged Navier Stokes) approach is used most often. An example of such papers can be the works [20]- [26], [32]. The article by Kutz et al (2012) [20] considers rotor in hover near the ground surface based on the FLOWer CFD package developed in DLR.…”

Section: Introductionmentioning

confidence: 99%

“…Wang's et al paper (2019) [25] is dedicated to the modeling of the aerodynamic characteristics of a rotor when flying near the ground surface for three cases: infinite ground surface effect, finite ground surface effect, and finite ground surface effects with different blocked area. In the work by Silva et al (2021) [26], the FVM based on Multiple Reference Frame (MRF) technique is used to simulate the aerodynamic characteristics of a hovering rotor in ground effect. A large number of works on numerical modeling of helicopter rotor aerodynamics in ground effect has also been performed based on the VTM (vorticity transport model) model of Brown [4], [27].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Main Rotor Wake Structures and Induced Velocity Fields at the Tail Rotor Location When Flying Near the Ground

Ignatkin

Makeev

Shomov

et al. 2021

IREASE

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The distance from the rotor's hub to the ground surface in the range of H = 6-16 m and the values of free stream (flight) velocity in the range of V = 0-15 m/s are considered. The results of the visualization for both rotor wake shapes and streamlines are obtained. The influence of the ground proximity on the rotor wake shape, including the formation of "supervortex" and "ground vortex" structures are analyzed. The induced velocity fields of the main rotor in the area of the tail rotor location for various azimuth positions relative to the main rotor axis are studied. The conclusion is made about the significant influence of the ground effect on the rotor wake structure and induced velocities field, including the area of the tail rotor location. Particularly, at slip flight with speed V = 10 m/s, when the distance to the ground surface H increases from 6 to 12 m, the value of the average induced velocity at the tail rotor plane is growing up to four times. The obtained data have allowed taking into account such effects of aerodynamic interference in the simplified mathematical model of the research flight simulator of JSC Helicopters Mil and Kamov.

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“…The present polynomial reconstruction is based upon the approaches of [5,6,13,52], that have been applied to smooth and discontinuous flow problems [38,47,72,[75][76][77][78][79][80][81][82][83][84][85][86] and only the key-components will be presented herein and the reader is referred to [5,6,52] for further details. Unstructured meshes involve the presence of various elements shapes and sizes, and a transformation from physical space to a reference space is performed to reduce the scaling effects as introduced by Dumbser et al [13,14,87].…”

Section: Reconstructionmentioning

confidence: 99%

Arbitrary high order central non-oscillatory schemes on mixed-element unstructured meshes

Tsoutsanis

Dumbser

2021

Computers & Fluids

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Simple multiple reference frame for high-order solution of hovering rotors with and without ground effect

Cited by 34 publications

References 45 publications

CWENO Finite-Volume Interface Capturing Schemes for Multicomponent Flows Using Unstructured Meshes

CWENO Finite-Volume Interface Capturing Schemes for Multicomponent Flows Using Unstructured Meshes

Numerical Study of the Main Rotor Wake Structures and Induced Velocity Fields at the Tail Rotor Location When Flying Near the Ground

Arbitrary high order central non-oscillatory schemes on mixed-element unstructured meshes

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