F201 DIRECT NUMERICAL SIMULATION OF TURBULENT WATER FLOW WITH PROPERTY VARIATIONS(DNS and computational procedure for turbulence)

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概要

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• Turbulent water flow in a channel with one wall heated and one wall cooled at the temperature ratio of 1.2 is simulated to study the effect of property variations on the near-wall turbulence structure using the direct numerical simulation technique. Due to the viscosity variation, the mean velocity decreases and increases near the cold and hot walls, respectively, whereas the skin friction shows the opposite behavior. Except very near the wall, cooling enhances the velocity fluctuations whereas heating suppresses them. In the viscous sublayer, the mean-velocity profiles collapse not in wall coordinates but in semi-local coordinates where local values of viscosity are used instead of wall values, but the mean temperature profiles collapse in wall coordinates. Also the rms velocity fluctuations collapses in semi-local coordinates, whereas the rms temperature fluctuations collapses in wall coordinates. In turbulent water flow, heating and cooling of the wall are roughly equivalent to suction and blowing from the wall or negative and positive surface displacements , respectively.

• 一般社団法人日本機械学会の論文
• 2000-10-01

著者

• Yoo Jung

  School Of Mechanical And Aerospace Engineering Seoul National University

• You Jongwoo

  National Crt Center For Turbulence And Flow Control Research Institute Of Advanced Machinery And Des

• Choi Haecheon

  National CRT Center for Turbulence and Flow Control Research, Institute of Advanced Machinery and De

• Choi Haecheon

  National Crt Center For Turbulence And Flow Control Research Institute Of Advanced Machinery And Des

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• F201 DIRECT NUMERICAL SIMULATION OF TURBULENT WATER FLOW WITH PROPERTY VARIATIONS(DNS and computational procedure for turbulence)

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