乱流が現れるＲｅ＝ｌ５００の回転二重円筒内流れの直接数値計算と実験値による検証

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  • Direct Numerical Simulation of Three-Dimensional Navier-Stokes Equations for Turbulent Circular Couette Flows (Re=1500) and Experimental Verification.
  • ランリュウ ガ アラワレル Re 1500 ノ カイテン 2ジュウ エントウナ

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The three-dimensional flow field of high Reynolds number (Re=1500) circular Couette flow was numerically simulated by a direct numerical simulation. We calculated instantaneous velocity vector diagrams and flow characteristics (mean velocity distributions, turbulent intensity distributions and auto-correlation coefficients) in a circular Couette flow developed quasi-steady state, and compared them with experimental data. Calculated results agree fairly well with the experimental data obtained by using a Laser Doppler Velocimeter (LDV). These results show that direct numerical simulation by using a third-order upstream finite-difference scheme for the convection term whose computational cell size is roughly two times the averaged Kolmogorov micro-scale of the flow predicts the flow fields of high Reynolds number circular Couette flows in which turbulent flows exist well.<BR>Since tangential velocities near the vortex (cell) boundaries are greatly changed by fluctuations of flow patterns, the intensities become larger than the θ-Z plane average. Both high and low velocity regions originating in the inner and the outer cylinders exist in the central region of γ-θ plane. So the maximum fluctuating velocities in the central region appear as two times the velocity of those in the inner and outer cylinder surface regions. Auto-correlation coefficients indicate that the flow field at Re=1500 has both periodic and turbulent characteristics.

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