公开(公告)号：US20090114002A1

公开(公告)日：2009-05-07

申请号：US12125409

申请日：2008-05-22

Applicant: MICHAEL M. BERNITSAS ,  KAMALDEV RAGHAVAN

Inventor： MICHAEL M. BERNITSAS ,  KAMALDEV RAGHAVAN

IPC: G01B5/28 ,  G01F1/32

CPC classification number: F15D1/12 ,  B63B2021/504 ,  Y10T137/2087

Abstract: Roughness is added to the surface of a bluff body in a relative motion with respect to a fluid. The amount, size, and distribution of roughness on the body surface is controlled passively or actively to modify the flow around the body and subsequently the Vortex Induced Forces and Motion (VIFM). The added roughness, when designed and implemented appropriately, affects in a predetermined way the boundary layer, the separation of the boundary layer, the level of turbulence, the wake, the drag and lift forces, and consequently the Vortex Induced Motion (VIM), and the fluid-structure interaction. The goal of surface roughness control is to decrease/suppress Vortex Induced Forces and Motion. Suppression is required when fluid-structure interaction becomes destructive as in VIM of flexible cylinders or rigid cylinders on elastic support, such as underwater pipelines, marine risers, tubes in heat exchangers, nuclear fuel rods, cooling towers, SPAR offshore platforms.

Abstract translation: 粗糙度以相对于流体的相对运动的方式被添加到非流线型体的表面。 身体表面的粗糙度的数量，大小和分布被动地或主动地被控制以修改身体周围的流动，随后调节Vortex诱导力和运动（VIFM）。 增加的粗糙度，当设计和实施适当时，以预定的方式影响边界层，边界层的分离，湍流的水平，尾流，阻力和提升力，并因此影响涡旋感应运动（VIM） 和流体 - 结构相互作用。 表面粗糙度控制的目的是减少/抑制涡旋诱导力和运动。 当流体 - 结构相互作用变为破坏性时，如弹性支撑件（如水下管道，海洋立管，热交换器管，核燃料棒，冷却塔，SPAR海上平台）中的柔性气缸或刚性气缸的VIM需要抑制。

公开(公告)号：US20090114001A1

公开(公告)日：2009-05-07

申请号：US12125380

申请日：2008-05-22

Applicant: MICHAEL M. BERNITSAS ,  KAMALDEV RAGHAVAN

Inventor： MICHAEL M. BERNITSAS ,  KAMALDEV RAGHAVAN

IPC: G01B5/28 ,  G01F1/32

CPC classification number: F03B17/06 ,  B63B2021/504 ,  F05B2240/201 ,  F05B2240/32 ,  F15D1/12 ,  Y02E10/28 ,  Y02E10/721 ,  Y10T137/2087

Abstract: Roughness is added to the surface of a bluff body in a relative motion with respect to a fluid. The amount, size, and distribution of roughness on the body surface is controlled passively or actively to modify the flow around the body and subsequently the Vortex Induced Forces and Motion (VIFM). The added roughness, when designed and implemented appropriately, affects in a predetermined way the boundary layer, the separation of the boundary layer, the level of turbulence, the wake, the drag and lift forces, and consequently the Vortex Induced Motion (VIM), and the fluid-structure interaction. The goal of surface roughness control is to increase Vortex Induced Forces and Motion. Enhancement is needed in such applications as harnessing of clean and renewable energy from ocean/river currents using the ocean energy converter VIVACE (Vortex Induced Vibration for Aquatic Clean Energy).