J091022 様々な周波数と振幅で振動する立方体容器内の熱対流構造([J09102]流体関連の騒音と振動(2))

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In this study, the authors numerically investigate the forced-oscillation-frequency responses on the three-dimensional thermal convection in a cubic cavity heated below in the gravitational field, concerning flow characteristics such as the flow structure and a global quantity the spatially-averaged kinetic energy T. The authors assume incompressible fluid with a Prandtl number Pr = 7.1 (water) and a Rayleigh number Ra 1.0x 104 and 4.0 x 104. The direction of a forced sinusoidal oscillation is parallel to that of the terrestrial gravity. The authors especially focus upon the influences of the forced oscillation amplitude j and frequency co in non-dimensional forms, whose test ranges are 1.5 < < 15 and 10 < co < 103. The obtained results are as follows. For both Ra's, we can observe the optimum frequency where the amplitude of k- attains the maximum at each q. For Ra = 4.0x 104, as well as for Ra = 4.0 x104, the optimum frequency becomes the minimum at 11 = 1.5 ? 2.0, being affected by the initial conditions. At < 1.5, the optimum frequency uniquely exists at each pi. On the other hand, at ri > 1.5, we can observe not single but plural optimum frequencies at each pi. The plural optimum frequencies suggest the appearances of various flow structures such as S1, S2, S4, S5, S6 and S8. This correspondence is also affected by the initial conditions. In addition, we have revealed the details of the flow structure S8.
一般社団法人日本機械学会の論文
2011-09-11

J091022 様々な周波数と振幅で振動する立方体容器内の熱対流構造([J09102]流体関連の騒音と振動(2))

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