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• W894799885 abstract "The suitability of existing models for the simulation of flow through turbomachines is investigated and compared with a recently proposed adaptive turbulence model. Discussed are the improvements in accuracy that can be achieved by using non-linear turbulence models and unsteady calculations. The adaptive turbulence model is based on two equation turbulence modeling. It uses the temporal and spatial scales of the flow field to automatically adapt itself to the unresolved turbulent fluctuations. At its asymptotic limits it reduces either to a Direct Numerical Simulation - when the turbulent scales are in the order of the Kolmogorov micro scale - or to a standard two equation model - when the fluctuations are not resolved at all. In order to compare the quality of the presented models two cases have been considered: the flow past a cylinder and a subsonic as well as transonic flow past the VKI turbine blade. Calculations have been performed for each case using all the models and the results have been compared with measurements. The unsteady calculations gave better agreement with the experimental data demonstrating the superiority over steady state calculations for turbomachines. The simulation of complex flow fields, especially in turbomachines, implies a com- promise between the attained accuracy and required computational resources. From this point of view ignoring the time evolution was for a while an acceptable approximation. The comparison of the results obtained in the past with the experimental work showed that for this special case the approximation was too coarse. The results of steady state calcula- tions can not predict the pressure loss accurately enough. The question was if an unsteady approach is more suitable. It has recently been shown that the unsteady approach gave an improved agreement of the calculated flow field with the measurement data compared to steady state computations (Chen and Leschziner (1), Magagnato (2)). The prediction of the large scale vortices generated by thick trailing edges of turbine blades plays an important role here. In another work attention was drawn toward developing a model that would permit the calculation of an unsteady simulation of flows in turbomachines with acceptable computational eort (time and memory usage; Magagnato and Gabi (3))." @default.
• W894799885 created "2016-06-24" @default.
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• W894799885 date "2001-01-01" @default.
• W894799885 modified "2023-09-26" @default.
• W894799885 title "THE MODELING OF UNSTEADY TURBULENT FLOWS IN TURBOMACHINES" @default.
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