Engineering Turbulence Modelling and Experiments 5 by W. Rodi, N. Fueyo

By W. Rodi, N. Fueyo

Turbulence is among the key matters in tackling engineering stream difficulties. As robust pcs and exact numerical equipment are actually to be had for fixing the movement equations, and because engineering purposes almost always contain turbulence results, the reliability of CFD research relies more and more at the functionality of the turbulence versions. This sequence of symposia offers a discussion board for proposing and discussing new advancements within the sector of turbulence modelling and measurements, with specific emphasis on engineering-related difficulties. The papers during this set of complaints have been provided on the fifth foreign Symposium on Engineering Turbulence Modelling and Measurements in September 2002. they appear at numerous components, together with: Turbulence modelling; Direct and large-eddy simulations; purposes of turbulence types; Experimental stories; Transition; Turbulence regulate; Aerodynamic movement; Aero-acoustics; Turbomachinery flows; warmth move; Combustion platforms; Two-phase flows. those papers are preceded by means of a bit containing 6 invited papers protecting numerous facets of turbulence modelling and simulation in addition to their functional program, combustion modelling and particle-image velocimetry.

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Engineering Turbulence Modelling and Experiments 5

Turbulence is without doubt one of the key concerns in tackling engineering move difficulties. As robust desktops and actual numerical tools at the moment are on hand for fixing the movement equations, and because engineering purposes almost always contain turbulence results, the reliability of CFD research relies more and more at the functionality of the turbulence types.

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1 ••^u / \ . 1 ? au,^ '• .... Q3 Figure 8: Bifurcation in stratified ^ow as function of stabilizing stratiGcation. Consider the solid curve in that figure: where branch 1 meets the abscissa, branch 1 terminates and this is called the bifurcation point. In a usual bifurcation, this would mark the transition of branch 2 from unstable to stable; here it does not: the term bifurcation is used in a slightly unconventional way. Branch 1 does not bifurcate from branch 2, rather it simply vanishes at Rigbifur (see figure 8).

More generally, it is unsuitable for complex flows because it is very difficuk to estimate the distribution of the mixing length One-equation models: such as k-L model. A suitable transport equation is added, usually for the turbulent kinetic energy (such as the one which has been proposed by Kolmogorov in 1942 and Prandtl in 1945). The main shortcoming concerns the Length scale Ls. Its transport is not considered, which is important in separated flows. This length scale must be prescribed 32 empirically.

Numerical Analysis became industrially used in the early 80s. By that time, the low capacities of computer systems only allowed to solve simple and mostly steady state problems. The underlying numerical technologies relied on the so-called implicit methods. With the arrival of vector supercomputers, it became possible on one hand to solve 3D CFD problems using implicit steadystate approximations and on the other hand in the structural domain to start using explicit techniques to solve the complex fast non-linear transient problems.

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