Eilmer: An open-source multi-physics hypersonic flow solver

Gibbons, Nicholas; Damm, Kyle A.; Jacobs, Peter A.; Gollan, Rowan

doi:10.1016/j.cpc.2022.108551

Cited by 29 publications

(10 citation statements)

References 54 publications

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“…The solver used in this study is the open-source multi-physics flow solver, Eilmer [51], part of the GDTk [52] gas dynamics toolkit developed at the University of Queensland. Eilmer is a general-purpose hypersonic simulation program that can solve the Euler, Navier-Stokes or Reynolds-Averaged Navier-Stokes equations on either structured or unstructured, two-or three-dimensional body-fitted grids using explicit time integration or Newton-Krylov acceleration for steady-state problems.…”

Section: Simluation Setupmentioning

confidence: 99%

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Aerodynamic Effects and Heat Flux Augmentation of a Transpiration Cooled Hypersonic Sharp Leading Edge

Ravichandran

Doherty

McGilvray

et al. 2023

AIAA SCITECH 2023 Forum

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This paper presents numerical results investigating the aerodynamic and aerothermal effects of mass injection applied to hypersonic sharp leading edges, in the context of active thermal protection systems. A numerical study was carried out using Eilmer to investigate the coupling of leading edge radius and mass injection on heat flux and drag augmentations. Radii from 1 mm to 25 mm were considered at blowing parameters from 0.0 to 1.5 on 2D planar leading edge at a fixed trajectory point. Drag was found to barely change with mass injection, whereas heat flux was found to significantly reduce at the leading edge. The leading edge heat flux distribution could be collapsed, and therefore predicted, straightforwardly. Film cooling predictive methods in literature for other mass injection scenarios were found to collapse the heat flux and concentration comfortably with empirical modifications.

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Section: Simluation Setupmentioning

confidence: 99%

“…This section will briefly outline the boundary conditions, simulation settings and the numerical methods employed in this study. A more complete description of the Eilmer solver may be found in [51,[53][54][55].…”

Section: Simluation Setupmentioning

confidence: 99%

Aerodynamic Effects and Heat Flux Augmentation of a Transpiration Cooled Hypersonic Sharp Leading Edge

Ravichandran

Doherty

McGilvray

et al. 2023

AIAA SCITECH 2023 Forum

View full text Add to dashboard Cite

show abstract

“…The pressure–velocity coupling is handled using the SIMPLE algorithm, and the near-wall treatment is implemented using an enhanced wall function approach. The default values are used for the under-relaxation factors. − In the iteration process, the residuals of continuity, x -velocity, y -velocity, z -velocity, k , and epsilon are controlled at a level, while the energy equation is controlled at a level. The iteration calculation is considered converged when the residuals reach the corresponding residual accuracy …”

Section: Grid Partitioning and Computational Methodsmentioning

confidence: 99%

Numerical Study on Enhanced Heat Transfer of Downhole Slotted-Type Heaters for In Situ Oil Shale Exploitation

Sun,

Liu,

Yan

et al. 2023

ACS Omega

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In order to improve the flow state of the heater shell side and enhance the performance evaluation of the heater, this paper proposes a perforated plate-type heater model. Based on Fluent, numerical studies are conducted on the heat transfer performance and shell-side fluid flow characteristics of a perforated plate-type heater. The variations of the heat transfer factor Nu, friction factor f, and evaluation parameter Nu/f 1/3 are analyzed for different helix angles β and ratios of the long and short semiaxes of the circular holes on the heating plate under different Reynolds numbers Re. The results reveal that under the same shell-side Reynolds number Re, the heat transfer factor Nu shows an increasing trend with the increase in the proportion of the helix angle β. The heat transfer factor Nu for the heating plate with the hole shape ratio a/b = 1 does not exhibit significant improvement compared to hole shape ratios a/b = 0.8 and a/b = 0.6, but it increases by 4.87 to 7.07% compared to the hole shape ratio a/b = 0.4 in the perforated plate-type heater. On the other hand, the friction factor f decreases as the helix angle β and the ratio of hole shapes on the heating plate increase. The lowest friction factor f is observed for the helix angle β of 25°and the hole shape ratio a/b = 1 in the perforated plate-type heater. When the helix angle β is 25°and the hole shape ratio is a/b = 1, the evaluation parameter Nu/f 1/3 reaches its highest value, indicating the optimal overall performance of the perforated plate-type heater.

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“…The description of the Eilmer code in this section is limited to the formulation of the inviscid gas dynamics, together with the thermal and chemical non-equilibrium modelling, since these are of primary interest in this study. A more complete description, including the handling of viscous effects, is available in Gibbons et al (2022).…”

Section: Computational Tools and Implementationmentioning

confidence: 99%

“…A more complete description, including the handling of viscous effects, is available in Gibbons et al. (2022).…”

Section: Computational Tools and Implementationmentioning

confidence: 99%

Computational analysis of experiments on shock detachment in hypersonic flow of nitrogen and carbon dioxide over a wedge

2022

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One of the most dramatic effects of vibrational and chemical non-equilibrium in hypersonic flows occurs in the bow-shock detachment process in flow over a wedge. This was shown theoretically and in reflected shock tunnel experiments by Hornung & Smith (J. Fluid Mech., vol. 93, 1979, pp. 225–239). In the present work, the effect is first demonstrated by computation of two-dimensional non-equilibrium flows. The effect of the finite transverse extent of the wedge is then studied by three-dimensional computations of non-relaxing flows. An analytical formula is obtained that gives the shock detachment distance of a finite wedge for ideal-gas and equilibrium flows. In the experiment, the finite transverse extent of the wedge competes with the non-equilibrium effects, as each introduces a new length scale. The carbon dioxide and nitrogen flows of the experiment are therefore computed in three dimensions and with two-temperature chemistry accounting for vibrational and chemical non-equilibrium. In the case of nitrogen flow, the agreement between experiment and computation is not good, the experimental detachment distance being larger. A number of possible reasons are quantitatively examined. A conclusive resolution of the discrepancy is considered to require a repeat of the experiment with more accurately characterized conditions. In the case of the carbon dioxide experiments, the computed results agree remarkably well with experiment. This is partially due to the fact that the condition is very close to equilibrium, where the sensitivity of the detachment process to relaxation effects is small. The analytical expression for the dimensionless detachment distance agrees very well with all the three-dimensional computations of non-relaxing flows.

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Eilmer: An open-source multi-physics hypersonic flow solver

Cited by 29 publications

References 54 publications

Aerodynamic Effects and Heat Flux Augmentation of a Transpiration Cooled Hypersonic Sharp Leading Edge

Aerodynamic Effects and Heat Flux Augmentation of a Transpiration Cooled Hypersonic Sharp Leading Edge

Numerical Study on Enhanced Heat Transfer of Downhole Slotted-Type Heaters for In Situ Oil Shale Exploitation

Computational analysis of experiments on shock detachment in hypersonic flow of nitrogen and carbon dioxide over a wedge

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