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Numerical experiments modelling turbulent flows
Trefilík, Jiří ; Kozel, Karel ; Příhoda, Jaromír
The paper deals with modification of the transition model with the algebraic equation for the intermittency coefficient proposed originally by Straka and Příhoda (2010) for the bypass transition for modelling of the transition at low free-stream turbulence. The modification is carried out using accessible experimental data for the flat-plate flow. Further, the three-equation k-kL-omega model proposed by Walters and Cokljat (2008) was used for the modelling of the transition at low free-stream turbulence. Both models were tested by means of the incompressible flow around airfoils at moderate and very low free-stream turbulence.
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Numerical simulations of turbulent flow through DCA 8% cascade
Trefilík, Jiří ; Kozel, K. ; Příhoda, Jaromír
The work deals with further development of numerical methods for simulation of transonic turbulent flows through the DCA 8% cascade. Results of numerical experiments modelling the viscous and inviscid flows in a cascade with various inlet Mach numbers are compared and discussed. For turbulence modelling the algebraic Baldwin-Lomax model and two- equation standard k-ω and TNT k-omega models were employed.
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Numerical experiments for turbulent flows
Trefilík, Jiří ; Kozel, Karel ; Příhoda, J.
The aim of the work is to explorethe possibilities of modelling transonic flowsin the internal and external aerodynamics. Several konfigurationswere analyzed and calculations were performed using both inviscid and viscous models of flow. Viscous turbulent flows have been simulated using either zero equation algebraic Baldwin-Lomax model and two equation k - w model in its basic version and improved TNT variant. The numerical solution was obtained using Lax-Wendroff scheme in the MAcCormack from on structured non-ortogonal grids. Artificial dissipation was added to improve the numerical stability. Achieved results are compared with experimental data.
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Experimental simulation of inviscid and viscous turbulent transonic flows
Trefilík, Jiří ; Kozel, K. ; Příhoda, Jaromír
The work deals with the development of numerical methods for simulation of transonic turbulent flows through the DCA 8% cascade and over the 18% thick circular arc biconvex airfoil. Results of numerical experiments modelling the viscous and inviscid flows in the cascade with the inlet Mach numbers M = 0.87 and 0.96 and over the airfoil with M =0.775 are compared and discussed. The two-equation k-omega model and the algebraic Baldwin-Lomax model were employed for turbulence modelling and their numerical results were compared.
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