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Dependence of Statistics of Low-Reynolds Number Compressible Turbulent Channel Flow on Non-Dimensional Parameters 2nd Report Energy Exchange and Reynolds Stress Transfer.

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  • 低レイノルズ数圧縮性チャネル乱流の乱流統計量の無次元パラメータ依存性  第2報  エネルギーの変換およびレイノルズ応力の輸送
  • テイレイノルズスウ アッシュクセイ チャネル ランリュウ ノ ランリュウ トウケイリョウ ノ ムジゲン パラメータ イゾンセイ ダイ2ホウ エネルギー ノ ヘンカン オヨビ レイノルズ オウリョク ノ ユソウ

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Abstract

In the second report, the dependence of the energy exchange and Reynolds stress transfer on the non-dimensional parameters, the Mach number and the Reynolds number, is investigated using the DNS data of the low-Reynolds number compressible turbulent channel flow between isothermal walls. The Mach number M is based on the bulk velocity and sound speed at the wall. The Reynolds number Re is based on the bulk density, bulk velocity, channel half-width, and viscosity at the wall. The main results of this report are as follows : (1) The absolute values of the production and dissipation terms of the turbulent kinetic energy decrease with the increase of M and increase with the increase of Re. These terms are more sensitive to Re than M. (2) The absolute value of the pressure work decreases with the increase of M because of the decrease of the mean pressure, while it increases with the increase of Re because of the increase of the absolute value of the mean dilatation. The pressure-dilatation correlation term has a slight contribution to the energy transfer and is almost independent of M and Re. (3) The absolute value of the pressure-strain correlation term decreases with the increase of M and increases with the increase of Re. (4) The dependence of the turbulence intensities of M and Re is explained by using the budgets of the transport equations of the Reynolds stresses.

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