Single phase flow
Hanjalic, Launder and Schiestel (1976) proposed to divide the turbulence structures conditionally into two groups. The first one describing the large scale motion and the second describing the transition scale motion leading to dissipation. Using the hypothesis of equilibrium between the transition scale motion and the small scale motion being dissipated the authors derived the following formalism.
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References
Hanjalic, K., Launder, B.E., Schiestel, R.: Multiple time scale concepts in turbulent transport modelling. In: Second symposium on turbulence shear flows, pp. 36–49 (1976)
Haynes, P.-A., Péturaud, P., Montout, M., Hervieu, E.: Strategy for the development of a DNB local predictive approach based on NEPTUNE CFD software. In: Proceedings of ICONE14, International Conference on Nuclear Engineering, Miami, Florida, USA, ICONE14-89678, July 17-20 (2006)
Lopez de Bertodano, M., Lahey Jr., R., Jones, O.C.: Phase distribution of bubbly two-phase flow in vertical ducts. Int. J. Multiphase Flow 20(5), 805–818 (1994)
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Kolev, N.I. (2011). Two group k − eps models. In: Multiphase Flow Dynamics 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20749-5_7
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