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Please try out our program for calculating the gas phase equilibrium state.
|An approach to calculating turbulent flows is to first average temporally the underlying Navier-Stokes equations (-> Reynolds Averaged Navier Stokes Equations, RANS) and to then solve them by using numerical methods. The information loss that arises in temporal averaging must be compensated for by the introduction of so-called turbulence models.|
With the class of 2-equation models, the effect of turbulence is described by two additional variables, for each of which a transport equation is solved. The model still most commonly used for this at present is the k-&epsilon model. Compared to more complex models (such as Reynolds stress models or Large Eddy Simulation) this offers the advantage of high numerical stability with relatively short computing time, and is therefore particularly predestined for industrial applications.
The disadvantage of models of this kind is the poor description of various typical flow configurations, such as flows in which severe curvature of the flow lines occurs. Suitable corrective approaches can compensate for these disadvantages and thereby considerably improve the applicability and quality of prediction. In view of the widespread technical application of swirl-stabilised flames, a focal point of research lies in the modelling of swirl flows.