Engineering Turbulence Modelling and Experiments 6. by W. Rodi and M. Mulas (Auth.)

By W. Rodi and M. Mulas (Auth.)

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Extra resources for Engineering Turbulence Modelling and Experiments 6. Procedings of the ERCOFTAC International Symposium on Engineering Turbulence Modelling and Measurements - ETMM6 -Sardinia, Italy, 23–25 May, 2005

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37. MOHD-YOSUF J. (1997) Combined immersed-boundary/B-spline methods for Simulations of flow in complex geometries. Annual Research Briefs, Center for Turbulence Research, 317-328. MORSE, n. , WHITELAW, J. H. ~ YIANNESKIS, M. (1978) Turbulent flow measurements by Laser Doppler Anemometry in a motored reciprocating engine. Report FS/78/24 Imperial College, Dept. Mesh. Eng. O'ROURKE, J. (1998) Computational Geometry in C Cambridge University Press. S. (1972) Flow Patterns Around Heart Valves: A Digital Computer Method for Solving the Equations of Motion.

2 - Fo.... 3,0); F,,rb = e - ( ~ l ' (8) 36 Re0c is the critical Reynolds number where the intermittency first starts to increase in the boundary layer. This occurs upstream of the transition Reynolds number, Re0~, and the difference between the two must be obtained from an empirical correlation. Both the Flength and Re0c correlations are functions of R e ~ . 0; (9) A modification for separation-induced transition is: / L Re)J Ysep = min 2. 235 Reoc -- 1 , 0 F r...... 0. , The transport equation for the transition momentum thickness Reynolds number, R e ~ , reads: cq~('o ~tff" e at ) + OXg -:Pot+ ~x j O'~ (fl "~ fit ) Ox j (l l) The source term is defined as follows" Pot = Cot 7P (Re ot -P-,e ot X1 9O- Fo,);, : minlmaxlkee''41~ o 1,,2 t = 500 /2 pU 2 1o 15 0 BL" 8 = 5 0 ~ y 98eL 0BL = Re~________~B.

Ideally, the simulations should be able to predict the particle-distribution, and the velocities and velocity fluctuations of both the continuous and dispersed phases. However, the interaction between the turbulence and the particles, and the presence of walls, leads to strong inhomogeneities and to the clustering of the particles. The understanding of these phenomena is still rather poor, and the success of the simulations is strongly dependent on how the physics involved is incorporated into the models.

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