By J.-P. Dussauge (auth.), Alain Dervieux, Marianna Braza, Jean-Paul Dussauge (eds.)
The computation of advanced turbulent flows by way of statistical modelling has already an extended background. the most well-liked two-equation versions at the present time have been brought within the early sev enties. despite the fact that those types were mostly verified in quite educational instances. The develope ment of pcs has resulted in a growing number of acurate numerical tools. The interactions betwe~n numerical and modelling thoughts are as a rule now not good mastered. in addition, computation of actual existence situations, together with 3D results, complicated geometries and strain gra dients in response to two-equation versions with low-Reynolds remedy on the proximity of partitions aren't rather of universal use. a great number of types has been proposed; this can be probably the signal that none of them is de facto passable, after which the overview in their generality isn't really a simple activity: it calls for loads of figuring out of the physics and many paintings for trying out the massive variety of proper situations which will examine their limits of validity that is a for a far better self assurance in engineering functions. this is often most likely why workshops and dealing teams are common and the ETMA consor tium has choosen to construct a state-of-the-art in theoretical and numerical statistical turbu lence modelling for actual lifestyles computations by way of taking a few marks with recognize to prior workshops resembling the Stanford conferences (1980,1981); a few difficulties are saved or up-to-date by means of new experiments, a few difficulties are discarded, a few new difficulties are brought; the focal point is stored on flows with 2nd geometries.
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Extra resources for Computation and Comparison of Efficient Turbulence Models for Aeronautics — European Research Project ETMA
W. 1991 Proceedings of the Eighth Symposium on Turbulent Shear Flows, Munich. Gennany. Sept. 9-11. Vol. 20-1. [l4] HA MfNH. • CHASSAING. •BRAZA. •KOURTA, A. & SEVRAIN. A. 1987 Rapport final. convention DRET IINPT n084/190. Mars 1987. Institut de Mecanique des FJuidcs de Toulouse ..  HA MINH. H. & CHASSAING. 1987 Rapport de convention DRETIINPT 87/131, Institut de Mecanique des FJuides de Toulouse. [l6] HA MINH. • VIEGAS. I. • RUBESIN. M. • VANDROMME, D. D. & SPALART. P. 1989 Proceedings of the Seventh Symposium on Turbulent Shear Flows, Stanford, CA, USA, August 21-23.
Me. As the predicted level of k is quite correct, this suggests that the level of e vs. Me is the problem to be addressed for such models. Similarly, as it is know that the tested compressible models are not efficient for supersonic turbulent boundary layers, it seems that a reassessment of the formulation of these models has to be made to improve their generality.
45. To check if the results don't depend on the freestream velocity and density ratio, additional computations have also been performed with the same freestream velocity ratio but with a lower density ratio equal to 1. 36) and case 2 (s=l). In the inlet section, the profiles for the velocity and the density are deduced from experimental similarity profiles. The experiment gives also the value of the maximum of the turbulent kinetic energy k. However for the dissipation, no data are available. A first approximation of the dissipation is obtained by assuming that the turbulent viscosity is constant and 100 times greater than the molecular viscosity.
Computation and Comparison of Efficient Turbulence Models for Aeronautics — European Research Project ETMA by J.-P. Dussauge (auth.), Alain Dervieux, Marianna Braza, Jean-Paul Dussauge (eds.)