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STRUCTURES AND MECHANISM OF HEAT AND MASS TRANSPORT PHENOMENA IN TURBULENT BOUNDARY LAYER WITH SEPARATION AND REATTACHMENT

Hirofumi Hattori
Information and Analysis Technologies Division, Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showaku, Nagoya 466-8555, JAPAN

Tomoki Noda
Department of Mechanical Engineering Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-8555, JAPAN

Masato Tagawa
Department of Electronical and Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, JAPAN

Yasutaka Nagano
Nagoya Industrial Science Research Institute; Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Аннотация

This paper presents observations and investigations of the detailed structure and mechanism of turbulent heat and mass transfer in turbulent boundary layer with separation and reattachment by means of direct numerical simulation. In order to observe turbulent heat and mass transfer in a boundary layer with reattachment and separation, DNSs of boundary layer with heat and mass transfer over a forward-facing step or a 2-dimensional block are carried out. The present DNSs demonstrate near-wall distributions of statistics of turbulent quantities which relate to heat and mass transfer around separation and reattachment points. Also, instantaneous turbulent heat and mass transfer are indicated so as to investigate a relation between instants and statistics of turbulent quantities, which can show heat and mass transfer mechanism in turbulent boundary layer with separation and reattachment. The quadrant analysis is carried out to investigate the turbulence motion for the production of Reynolds shear stress and wall-normal turbulent heat flux, in which it is revealed that Q1 and Q3 events (i.e., interactions) affect these quantities on the 2-D block.