Comparison of Finite-Volume and Spectral/hp Methods for Large-Eddy Simulation of Combustor Port Flow

Saini, Vishal; Xia, Hao; Page, Gary J.

doi:10.2514/1.j060961

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…A comparison of the performance of some of the numerical methods mentioned above is possible for some benchmark cases available in the literature. Saini et al [293] reported a comparison between the open-source codes OpenFOAM [294], based on the unstructured finite-volume method, and Nektar++, based on the spectral-hp method, for LES of a moderately complex geometry relevant to gas turbine combustor, showing better agreement with reference experimental data for Nektar++ for a given computational cost between codes or, viceversa, the same agreement could be obtained with OpenFOAM with 3.4 times more expensive simulation. Higher computational efficiency for the spectral-hp method was also demonstrated by [295] in the LES study of flow past a circular cylinder for Reynolds numbers ranging from 400 to 3900.…”

Section: Numerical Methods and Codes For Turbulent Flows Simulationsmentioning

confidence: 86%

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Ferrari

Rossi²,

Bernardino

2022

Energies

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Turbulence is still an unsolved issue with enormous implications in several fields, from the turbulent wakes on moving objects to the accumulation of heat in the built environment or the optimization of the performances of heat exchangers or mixers. This review deals with the techniques and trends in turbulent flow simulations, which can be achieved through both laboratory and numerical modeling. As a matter of fact, even if the term “experiment” is commonly employed for laboratory techniques and the term “simulation” for numerical techniques, both the laboratory and numerical techniques try to simulate the real-world turbulent flows performing experiments under controlled conditions. The main target of this paper is to provide an overview of laboratory and numerical techniques to investigate turbulent flows, useful for the research and technical community also involved in the energy field (often non-specialist of turbulent flow investigations), highlighting the advantages and disadvantages of the main techniques, as well as their main fields of application, and also to highlight the trends of the above mentioned methodologies via bibliometric analysis. In this way, the reader can select the proper technique for the specific case of interest and use the quoted bibliography as a more detailed guide. As a consequence of this target, a limitation of this review is that the deepening of the single techniques is not provided. Moreover, even though the experimental and numerical techniques presented in this review are virtually applicable to any type of turbulent flow, given their variety in the very broad field of energy research, the examples presented and discussed in this work will be limited to single-phase subsonic flows of Newtonian fluids. The main result from the bibliometric analysis shows that, as of 2021, a 3:1 ratio of numerical simulations over laboratory experiments emerges from the analysis, which clearly shows a projected dominant trend of the former technique in the field of turbulence. Nonetheless, the main result from the discussion of advantages and disadvantages of both the techniques confirms that each of them has peculiar strengths and weaknesses and that both approaches are still indispensable, with different but complementary purposes.

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Section: Numerical Methods and Codes For Turbulent Flows Simulationsmentioning

confidence: 86%

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Ferrari

Rossi²,

Bernardino

2022

Energies

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Numerical Dissipation Rate Analysis of Finite-Volume and Continuous-Galerkin Methods for LES of Combustor Flow-Field

Saini

Xia

Page

2023

Flow Turbulence Combust

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A growing body of literature indicates that element-based high-order methods can exhibit considerable accuracy/cost benefit over conventional second-order finite-volume (FV) methods for large-eddy simulations (LES). This may even hold true for complex configurations relevant to industry that involve under-resolving unstructured grids. However, it is not often clear whether the accuracy/cost benefit stems from the low-dissipative nature of the high-order numerical schemes or from using a different LES approach (implicit/explicit), or a combination of the two. The present paper employs a numerical dissipation rate analysis technique due to Schranner et al. (Comput Fluids 114:84–97, 2015) to better understand the reasons for the high-order benefit seen previously on a complex LES test case related to gas-turbine combustors. It is established that a high(fifth)-order LES run provides better accuracy than its second-order FV counterpart at the same computational cost primarily because of lower numerical dissipation and the LES model dissipation has a secondary role to play. The numerical dissipation is found to contribute 60–90% of the total (numerical and LES model) dissipation.

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High-order optimal mode decomposition analysis of the ground effect on flow past two tandem inclined plates

Zhou

Zhang

et al. 2023

Physics of Fluids

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Two-dimensional flow past two tandem near-ground plates with inclination angles of 25{degree sign} at Reynolds number of 150 is numerically simulated via the high-order spectral element method. Plate-to-ground gap is varied from G = 0.2L to 1.6L with intervals of 0.2L at two inter-plates spacing (i.e., X = 2.5L and 6L). The ground effect on the fluid force and flow structures are systematically evaluated. Then, the high-order optimal mode decomposition (HOOMD) method is developed to synchronously analyze the velocity and pressure fields. The results show that the ground inhibits vortex shedding when G < 0.6L; as the gap increases from 0..6L to 1.4L, the fluctuating forces are continuously enhanced until the ground effect basically disappears at G > 1.4L. The ground effect exacerbates the asymmetry of the vortex structure near the upper and lower parts of the inclined plates, consequently changing the fluid force. The downstream plate is more sensitive to the ground effect because of impingement from the upward-biased jet flow generated in the narrow gap between the upstream plate and ground. The HOOMD method well captures the coherence modes at the transition or vortex shedding flow regime. Mode analysis affords a correspondence between the coherent vortex structure and fluid force of plates. Furthermore, the ground effect can simultaneously change the global mode energy and local pressure mode shape, subsequently influencing the fluid force. However, the global mode energy play s the determinant roles in the variation of the fluid force of plates with the plate-to-ground distance herein.

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Comparison of Finite-Volume and Spectral/hp Methods for Large-Eddy Simulation of Combustor Port Flow

Cited by 3 publications

References 54 publications

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Numerical Dissipation Rate Analysis of Finite-Volume and Continuous-Galerkin Methods for LES of Combustor Flow-Field

High-order optimal mode decomposition analysis of the ground effect on flow past two tandem inclined plates

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