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Numerical simulation of turbulent compressible flows
Trefilík, J. ; Kozel, Karel ; Příhoda, Jaromír
The work deals with the development of numerical methods for simulation of subsonic and transonic turbulent flow over the DCA 20% profile in a cascade configuration with a zero stagger angle. Numerical results for compressible subsonic flow for Mach numbers M1 = 0.35 and 0.5 are compared with respekt to two different used turbulence models. A special attention was paid to modelling of the separation region near the trailing edge of profile.
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Prediction of turbulent flow over the inclined step by means of various two-equation turbulence models
Janeček, Vladislav ; Příhoda, Jaromír
The work deals with the numerical simulation of turbulent flow over an inclined step in a channel of the rectangular cross-section according to measurement of Makiola (1992). The simulation was carried out by means of the commercial software ANSYS FLUENT with users defined functions. Various two-equation turbulence models based on the k-eps formulation were tested with the aim to estimate their ability to predict the extent of the separation region and energy losses due to inclined step with the angle 15 deg. Numerical results were compared with experimental data from LDA measurements. Besides, determined energy losses were compared with losses in a channel with a backward-facing step.
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Prediction of flow over a backward-facing step in the Star CD code using various turbulence models
Štěpaníková, D. ; Příhoda, Jaromír
The comparison of several turbulence models was carried out by the commercial software Star CD for turbulent flow over a backward-facing step with the aim to assess their ability to accurately predict separated flow. Presented simulation was focused on the two aspects, namely the effect of the inlet boundary conditions on the prediction and the relaxation of the shear layer behind the reattachment. Used modifications of two-equation models, especially the non-linear k-eps model and the v2-f model, show some advantages in comparison with the standard k-eps model, but none of used modifications gives positively a better agreement with experimental data than the SST model.
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