In this paper, 2-D computational analyses were conducted for unsteady high Reynolds number flows around a smooth circular cylinder in the supercritical and upper-transition flow regimes, i.e. 8.21×104〈Re〈1.54&#...In this paper, 2-D computational analyses were conducted for unsteady high Reynolds number flows around a smooth circular cylinder in the supercritical and upper-transition flow regimes, i.e. 8.21×104〈Re〈1.54×106. The calculations were performed by means of solving the 2-D Unsteady Reynolds-Averaged Navier-Stokes （URANS） equations with a k-ε turbulence model. The calculated results, produced flow structure drag and lift coefficients, as well as Strouhal numbers. The findings were in good agreement with previous published data, which also supplied us with a good understanding of the flow across cylinders of different high Reynolds numbers. Meanwhile, an effective measure was presented to control the lift force on a cylinder, which points the way to decrease the vortex induced vibration of marine structure in future.展开更多
The continuous acceleration of the modernization process and the continuous development of science and technology have not only brought about economic progress, but also accelerated the consumption of energy and the d...The continuous acceleration of the modernization process and the continuous development of science and technology have not only brought about economic progress, but also accelerated the consumption of energy and the demand of the ore industry, bringing severe challenges to China's energy production and distribution. This paper further discusses the related exploration methods by understanding the main problems in deep geological prospecting in China, hoping to provide some references and suggestions for the mineral industry in China.展开更多
基金Foundation item： Supported by Supported by the National Natural Science Foundation of China （Grant No. 51009070）.
文摘In this paper, 2-D computational analyses were conducted for unsteady high Reynolds number flows around a smooth circular cylinder in the supercritical and upper-transition flow regimes, i.e. 8.21×104〈Re〈1.54×106. The calculations were performed by means of solving the 2-D Unsteady Reynolds-Averaged Navier-Stokes （URANS） equations with a k-ε turbulence model. The calculated results, produced flow structure drag and lift coefficients, as well as Strouhal numbers. The findings were in good agreement with previous published data, which also supplied us with a good understanding of the flow across cylinders of different high Reynolds numbers. Meanwhile, an effective measure was presented to control the lift force on a cylinder, which points the way to decrease the vortex induced vibration of marine structure in future.
文摘The continuous acceleration of the modernization process and the continuous development of science and technology have not only brought about economic progress, but also accelerated the consumption of energy and the demand of the ore industry, bringing severe challenges to China's energy production and distribution. This paper further discusses the related exploration methods by understanding the main problems in deep geological prospecting in China, hoping to provide some references and suggestions for the mineral industry in China.
