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Energy transport between turbulent structures and polymer in drag-reducing channel flow by using beads-spring-dashpot chain model

Masanobu Fujimura
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-26 Naka-cho, Koganei-shi, Tokyo 184-8588, Japan

Hiroya Mamori
Department of Mechanical Engineering, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522,Japan; Department of Mechanical Systems Engineering Tokyo University of Agriculture and Technology 2-24-16 Koganei City Naka Town Tokyo; Tokyo University of Science,6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan

Kaoru Iwamoto
Department of Mechanical Engineering, Tokyo University of Science, Noda-shi, Chiba 278-8510; Department of Mechanical System Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

Akira Murata
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

M. Masuda
National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8568, Japan

H. Ando
National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan

Abstrakt

Numerical simulation of a drag-reducing turbulent channel flow due to polymer is performed. The beads-spring-dashpot chain model is employed as a model of polymer. The model consists of beads, springs, and dashpot to represent polymer dynamics. Energy exchange between the polymer and the fluid is mainly focused to discuss the drag-reduction mechanism. Results show that the energy transport by the polymer models enhances the streamwise velocity fluctuation and strengthen the turbulence anisotropy.

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