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A numerically upgraded instability-sensitized Reynolds stress model for complex turbulent flow applications

DOI: 10.1615/ICHMT.2015.THMT-15.550
pages 299-302

R. Maduta
Outotec GmbH, Ludwig-Erhard-Strasse 21, D-61440 Oberursel, Germany

Suad Jakirlic
Department of Mechanical Engineering Institute of Fluid Mechanics and Aerodynamics (SLA) / Center of Smart Interfaces (CSI) Technische Universitat Darmstadt Petersenstrasse 17, D-64287 Darmstadt, Germany

M. Ullrich
Institute of Fluid Mechanics and Aerodynamics / Center of Smart Interfaces, Technische Universität Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany

Abstract

The present work deals with an upgrade of the recently developed instability-sensitized Reynolds stress model of turbulence. A coupling procedure hybridizing direct introduction of the Reynolds stress tensor, originating from a corresponding transport equation, into the relevant equation of motion with that expressing it via the Boussinesq correlation, enables more robust use of higher order discretization methods making it especially suitable for coarser grid resolutions. This is of particular interest concerning industrially-relevant applications at higher flow Reynolds numbers. Before showing the model performances in a complex hydro-cyclone two-phase flow configuration illustrating a typical industrial case where the use of coarser grids is often the only affordable option, the model's predictive capabilities is demonstrated by computing some generic flow cases including the homogeneous isotropic turbulence decay as well as channel/pipe flows in a reasonable Reynolds number range. The model is applied in conjunction with universal wall functions.

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