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FLOW AND HEAT TRANSFER IN CROSS-STREAM TYPE T-JUNCTIONS: A COMPUTATIONAL STUDY

Benjamin Krumbein
Institute of Fluid Mechanics and Aerodynamics, Technische Universitat Darmstadt Allarich-Weiss-Strasse 10, 64287 Darmstadt, 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

Vincenzo Termini
Institute of Fluid Mechanics and Aerodynamics, Technische Universitat Darmstadt Allarich-Weiss-Strasse 10, 64287 Darmstadt, Germany

Anna Mizobuchi
Institute of Fluid Mechanics and Aerodynamics, Technische Universitat Darmstadt Allarich-Weiss-Straße 10, 64287 Darmstadt, Germany; Department of Mechanical Engineering, Keio University Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522, Japan

Cameron Tropea
Technische Universität Darmstadt, Institute of Fluid Mechanics and Aerodynamics, Center of Smart Interfaces, International Research Training Group Darmstadt-Tokyo on Mathematical Fluid Dynamics, Germany

Résumé

The present computational study is concerned with the thermal mixing of flow-crossing streams in a T-shaped junction, focussing primarily on a configuration subjected to temperature dependent fluid property conditions. The reference experimental investigation is conducted by Hirota et al. (2010). Preliminary, a quasi-two dimensional configuration with constant fluid properties, for which the reference DNS (Direct Numerical Simulation) database is made available by Hattori et al. (2014), is simulated. The presently applied computational model is based on a VLES (Very Large Eddy Simulation) formulation of Chang et al. (2014). The residual turbulence is modeled employing the RANS-based (Reynolds-Averaged Navier-Stokes) elliptic-relaxation eddy viscosity model of Hanjalic et al. (2004). In addition to the VLES, both flow configurations are computed applying the background RANS model representing the constituent of the VLES method. Whereas the eddy viscosity model describes fully-modeled turbulence in the RANS framework, it relates to the unresolved sub-scale turbulence within the VLES methodology. Unlike the RANS method, the VLES method is capable of capturing the spectral dynamics of turbulence to an extent complying with the underlying grid resolution. The results obtained with the present VLES model follow closely the reference DNS data in the Hattori et al. (2014) case. In the more complex Hirota et al. (2010) configuration, the flow field is captured reasonably well, while the computationally obtained thermal fields suggest a more intensive mixing relative to the reference experiment.