Navier-Stokes solution of transonic cascade flows using nonperiodic C-type grids

Arnone, Andrea; Liou, Meng-Sing; Povinelli, Louis A.

doi:10.2514/3.23493

Cited by 77 publications

(47 citation statements)

References 6 publications

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“…The time-accurate release of the TRAF code [24] was used in this study. The unsteady, three-dimensional, Reynolds averaged Navier-Stokes (RANS) equations are written in conservative form in a curvilinear, body-fitted coordinate system and solved for density, absolute momentum components, and total energy.…”

Section: Computational Frameworkmentioning

confidence: 99%

An assessment of the laminar kinetic energy concept for the prediction of high-lift, low-Reynolds number cascade flows

Pacciani

Marconcini

Arnone

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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Abstract:The laminar kinetic energy (LKE) concept has been applied to the prediction of lowReynolds number flows, characterized by separation-induced transition, in high-lift airfoil cascades for aeronautical low-pressure turbine applications. The LKE transport equation has been coupled with the low-Reynolds number formulation of the Wilcox's k À ! turbulence model. The proposed methodology has been assessed against two high-lift cascade configurations, characterized by different loading distributions and suction-side diffusion rates, and tested over a wide range of Reynolds numbers. The aft-loaded T106C cascade is studied in both high-and low-speed conditions for several expansion ratios and inlet freestream turbulence values. The front-loaded T108 cascade is analysed in high-speed, low-freestream turbulence conditions. Numerical predictions with steady inflow conditions are compared to measurements carried out by the von Kármán Institute and the University of Cambridge. Results obtained with the proposed model show its ability to predict the evolution of the separated flow region, including bubble-bursting phenomenon and the formation of open separations, in high-lift, low-Reynolds number cascade flows.

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Section: Computational Frameworkmentioning

confidence: 99%

An assessment of the laminar kinetic energy concept for the prediction of high-lift, low-Reynolds number cascade flows

Pacciani

Marconcini

Arnone

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…=0 or (13) which ensures that no spurious source terms are introduced at level /. Equation (13) can be satisfied by choosing the residual collection operator properly: Fig.…”

Section: Multigrid Adaptive Strategymentioning

confidence: 98%

“…Equation (13) can be satisfied by choosing the residual collection operator properly: Fig. 2 provides a sketch of the contributions of each node at level / -f-1 to the residual collection at the coarserlevel nodes, denoted by dots.…”

Section: Multigrid Adaptive Strategymentioning

confidence: 99%

Cell-vertex adaptive Euler method for cascade flows

et al. 1995

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This paper is concerned with the numerical solution of the two-dimensional steady Euler equations, using a multidimensional upwind cell-vertex residual distribution scheme. A solution-adaptive grid-refinement procedure is proposed, which combines with an efficient multigrid strategy based on an optimally smoothing explicit multistage scheme. A very accurate treatment of solid wall boundaries and a general approach for guaranteeing conservation on patched grids are developed within the present context of cell-vertex residual distribution schemes. The proposed approach is shown to be very efficient and sufficiently accurate to compute the transonic flow past a high-turning turbine cascade.

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“…The code has been used to compute transonic/supersonic cascade flows [13,14] as well as rotor-stator interaction in turbine [15] and compressor stages [16][17][18].…”

Section: Computational Frameworkmentioning

confidence: 99%

Special Challenges in the Computational Fluid Dynamics Modeling of Transonic Turbo-Expanders

Rubechini¹,

Marconcini²,

Arnone

et al. 2013

Journal of Engineering for Gas Turbines and Power

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High pressure ratio turbo-expanders often put a strain on computational fluid dynamics (CFD) modeling. First of all, the working fluid is usually characterized by significant departures from the ideal behavior, thus requiring the adoption of a reliable real gas model. Moreover, supersonic flow conditions are typically reached at the nozzle vanes discharge, thus involving the formation of a shock pattern, which is in turn responsible for a strong unsteady interaction with the wheel blades. Under such circumstances, performance predictions based on classical perfect gas, steady-state calculations can be very poor. While reasonably accurate real gas models are nowadays available in most flow solvers, unsteady real gas calculations still struggle to become an affordable tool for investigating turbo-expanders. However, it is emphasized in this work how essential the adoption of a time-accurate analysis can be for accurate performance estimations. The present paper is divided in two parts. In the first part, the computational framework is validated against on-site measured performance from an existing power plant equipped with a variable-geometry nozzled turbo-expander, for different nozzle positions, and in design and off-design conditions. The second part of the paper is devoted to the detailed discussion of the unsteady interaction between the nozzle shock waves and the wheel flow field. Furthermore, an attempt is made to identify the key factors responsible for the unsteady interaction and to outline an effective way to reduce it.

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Navier-Stokes solution of transonic cascade flows using nonperiodic C-type grids

Cited by 77 publications

References 6 publications

An assessment of the laminar kinetic energy concept for the prediction of high-lift, low-Reynolds number cascade flows

An assessment of the laminar kinetic energy concept for the prediction of high-lift, low-Reynolds number cascade flows

Cell-vertex adaptive Euler method for cascade flows

Special Challenges in the Computational Fluid Dynamics Modeling of Transonic Turbo-Expanders

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