This 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.

Accurate numerical simulation of compressible turbulent flows in turbomachinery / De Palma, Pietro. - ELETTRONICO. - (2001). (Intervento presentato al convegno 15th AIAA Computational Fluid Dynamics Conference, Fluid Dynamics tenutosi a Anaheim, CA nel June 11-14, 2001) [10.2514/6.2001-2926].

Accurate numerical simulation of compressible turbulent flows in turbomachinery

Pietro De Palma
2001

Abstract

This 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.
2001
15th AIAA Computational Fluid Dynamics Conference, Fluid Dynamics
Accurate numerical simulation of compressible turbulent flows in turbomachinery / De Palma, Pietro. - ELETTRONICO. - (2001). (Intervento presentato al convegno 15th AIAA Computational Fluid Dynamics Conference, Fluid Dynamics tenutosi a Anaheim, CA nel June 11-14, 2001) [10.2514/6.2001-2926].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/13904
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