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EnglishThis paper provides an accurate and efficient methodology for computing turbulent and transitional flows by solving the compressible Reynolds-averaged Navier-Stokes equations with an explicit algebraic stress model and k - ω turbulence closure. The space discretization is based on a finite volume method with Roe's approximate Riemann solver and formally second-order-accurate MUSCL extrapolation. Second-order accuracy in time is achieved using a dual time stepping technique combined with an explicit Runge-Kutta scheme and multigrid acceleration to converge the false transient at each physical time level. The turbulence model has been validated computing the vortex shedding behind a two-dimensional turbine cascade. Furthermore, the transition model of Mayle for separated flow has been combined with such a turbulence model; such a methodology has been validated computing the flow through the T106 low-pressure turbine cascade with separated-flow transition at the suction-side boundary layer. Finally, the three-dimensional flow through the T106 linear cascade has been computed providing the analysis of the loss-coefficient distribution downstream of the cascade and the description of the interaction between the secondary flow pattern and the suction-side separation bubble.
| Autori: | |
| Titolo: | Accurate numerical simulation of compressible turbulent flows in turbomachinery |
| Data di pubblicazione: | 2001 |
| Nome del convegno: | 15th AIAA Computational Fluid Dynamics Conference, Fluid Dynamics |
| Digital Object Identifier (DOI): | 10.2514/6.2001-2926 |
| Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |
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http://hdl.handle.net/11589/13904
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