Modeling of Three-Dimensional Viscous Compressible Turbomachinery Flows Using Unstructured Hybrid Grids

Sayma, A. I.; Vahdati, Mehdi; Sbardella, L.; Imregun, M.

doi:10.2514/2.1062

Cited by 105 publications

(37 citation statements)

References 23 publications

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“…Rai (1987) showed that stator/rotor interactions could be simulated using the thin-layer Navier -Stokes equations. Further work was reported by Jorgenson and Chima (1989), He (1990), He and Denton (1991), Arnone (1995) and Sayma et al (2000).…”

Section: Time-marching Methods For Non-linear Unsteady Aerodynamicsmentioning

confidence: 72%

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Transonic Rotor/Stator Interaction Using a 3-D Linearised Unsteady Viscous Flow Model

Sbardella

Imregun

2002

International Journal of Computational Fluid Dynamics

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The paper first summarizes the forced response problem in turbomachinery and reviews various numerical methods for the simulation of unsteady flows. A particular technique, based on the linearisation of the unsteady Favre-averaged Navier -Stokes equations on three-dimensional mixedelement grids of tetrahedra, hexahedra and wedges, is described in some detail. The methodology was applied to a NGV/rotor interaction benchmark case for which detailed steady and unsteady flow measurements are available. The steady-state flow, calculated using a non-linear viscous representation, was described in detail with emphasis on features such as separation, horseshoe and passage vortices, tip leakage and shock structure since these are likely to influence the unsteady flow. The sources of unsteadiness on the rotor passage were evaluated from the steady-state solution at the NGV outlet. The disturbances were split into vortical, entropic and potential waves, the Fourier components of which were considered separately. The summation of the vortical and entropic waves was used as a rotor inlet boundary condition in order to assess the wake/rotor unsteady interaction. Similarly, potential waves were used to study the potential/rotor interaction. The results obtained from these two types of unsteady interactions were superimposed and compared with experimental data. Good qualitative and, in most cases, quantitative agreement was obtained, a finding which suggests that the unsteady flowfield generated by the relative blade motion can be considered to be a quasi-linear phenomenon for the particular HP turbine studied. Finally, the mechanisms of wake/rotor and potential/rotor interactions were studied in some detail and it was concluded that the former was strong in the crown of the blade while the latter was dominant in the leading edge region.

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Section: Time-marching Methods For Non-linear Unsteady Aerodynamicsmentioning

confidence: 72%

“…The wall shear stresses were evaluated using the generalized law of the wall (White, 1991). The details of the numerical model used in the steady-state flow simulation are given by Sayma et al (2000).…”

Section: Steady-state Flow Analysismentioning

confidence: 99%

Transonic Rotor/Stator Interaction Using a 3-D Linearised Unsteady Viscous Flow Model

Sbardella

Imregun

2002

International Journal of Computational Fluid Dynamics

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“…However, when the number of sub-time levels is large the cost of computing the time derivative increases. The high-dimensional harmonic balance method as described here has some similarities to the ''dual time step" method, used by Davis et al [20], Sayma et al [30], and others to compute unsteady flows in the time domain. Our approach, however, has a number of important advantages.…”

Section: Numerical Solution Techniquementioning

confidence: 96%

Computationally fast harmonic balance methods for unsteady aerodynamic predictions of helicopter rotors

Ekici

Hall

Dowell

2008

Journal of Computational Physics

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“…The CFD code used in this investigation is an in-house code, SURF, which is an implicit time accurate 3D compressible solver based on the methodology developed by Sayma et al [13]. It uses an edge-based data structure for computational efficiency.…”

Section: The 3d Flow Solvermentioning

confidence: 99%

Computational fluid dynamics simulations of blade damage effect on the performance of a transonic axial compressor near stall

Sayma

2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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Modeling of Three-Dimensional Viscous Compressible Turbomachinery Flows Using Unstructured Hybrid Grids

Cited by 105 publications

References 23 publications

Transonic Rotor/Stator Interaction Using a 3-D Linearised Unsteady Viscous Flow Model

Transonic Rotor/Stator Interaction Using a 3-D Linearised Unsteady Viscous Flow Model

Computationally fast harmonic balance methods for unsteady aerodynamic predictions of helicopter rotors

Computational fluid dynamics simulations of blade damage effect on the performance of a transonic axial compressor near stall

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