...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Fluids and Structures >Drag reduction induced by the addition of a multi-cavity at the base of a bluff body
【24h】

Drag reduction induced by the addition of a multi-cavity at the base of a bluff body

机译：通过在钝体的底部添加多腔来减少阻力

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present a three-dimensional numerical study on the drag reduction of a D-shaped body, of chord length L, height H and spanwise width W, with H/W 1, aligned with a turbulent incompressible free-stream of velocity U_∞, density ρ and viscosity μ. In particular, an extensive parametric study is performed numerically using the IDDES turbulent model, at a Reynolds number, Re = ρU_∞H/μ = 20 000, to analyze the effect on the drag coefficient, C_D, of adding a single or a multi-cavity of variable depth, h, at the base of the body. It has been observed that, in the range 0 ≤ h/H ≤ 0.3, the average drag decreases monotonically reaching an asymptotic value in both cases. However, shorter cavity depths are necessary to reach the same reduction in the case of the body with a multi-cavity. On the other hand, the temporal evolution of the drag shows a considerable reduction of the flow randomness with the addition of a multi-cavity, which translates into a much less chaotic and quasi-two dimensional wake.
机译：我们提出了一个三维数值研究，它是弦长L，高度H和翼展方向宽度W的D形物体的减阻作用，H / W 1，与速度U_的湍流不可压缩自由流对齐∞，密度ρ和粘度μ。特别是，使用IDDES湍流模型以雷诺数Re =ρU_∞H/μ= 20 000进行数字形式的广泛参数研究，以分析添加一个或多个对阻力系数C_D的影响。 -在主体底部的深度可变的洞h。已经观察到，在两种情况下，在0≤h / H≤0.3的范围内，平均阻力单调下降，达到渐近值。但是，在具有多腔体的情况下，需要较短的腔体深度以实现相同的减小。另一方面，阻力的时间演变显示，由于增加了多腔，流动随机性显着降低，这转化为更少的混沌和准二维尾流。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号