Time domain vortex-induced lift force determination method of deep-water riser

A determination method and riser technology, which is applied in the field of time-domain vortex-induced lift determination of deep-water risers, can solve the problems of not considering the velocity effect of deep-water risers, small calculation results, and low vibration frequency of deep-water risers

Inactive Publication Date: 2014-02-26
OCEAN UNIV OF CHINA
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Problems solved by technology

Therefore, the calculated deepwater riser vibration frequency is low;
[0007] (2) The velocity effect of the cross-flow vibration of the deep-water riser is not considered, and the viscous resistance caused by the relative velocity change between the deep-water riser and the fluid is ignored, so the calculation result is too small

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  • Time domain vortex-induced lift force determination method of deep-water riser
  • Time domain vortex-induced lift force determination method of deep-water riser
  • Time domain vortex-induced lift force determination method of deep-water riser

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Embodiment Construction

[0090] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0091] The traditional vortex-induced vibration theory believes that the downstream vortex-induced vibration of deepwater risers is very small and can be ignored. Therefore, the vortex-induced vibration of the deep-water riser is the vibration that is perpendicular to the fluid flow direction and is accepted by people. "Vortex-induced vibration" only means the vertical flow direction vibration of the deepwater riser, which can be proved from the calculation methods of many commercial softwares. Orcaflex, VIVA and Shear7 are currently recognized deepwater riser vortex-induced vibration analysis software in the ocean engineering community, and are widely used in deepwater riser vortex-induced vibration and fatigue analysis. However, these software only provide lateral vortex-induced vibration analysis results. Of course, there is no downstream vortex-induced v...

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Abstract

The invention relates to a research method of an ocean deep-water riser, in particular to a time domain vortex-induced lift force determination method of a deep-water riser. The method introduces viscous drag and additional mass force which are generated by transverse flow direction vibration speed and acceleration of the deep-water riser into the calculation of vortex-inducted lift force. Moreover, an iterative method is adopted to calculate the vortex-induced lift force of a time domain, so as to create a complete fluid-solid coupling time domain vortex-induced lift force calculation method. Since the viscous drag and the additional mass force which are generated by the vibration speed and the acceleration of the deep-water riser are added, compared with the existing method, the method is more accordant with the stress status of cylinder transverse flow direction vortex-induced vibration.

Description

Technical field [0001] The invention relates to a research method of marine deep-water riser, in particular to a method for determining the time-domain vortex-induced lift of a deep-water riser. Background technique [0002] Vortex-induced lift is an alternating fluid load perpendicular to the direction of fluid flow on the cylinder, which is caused by the vortex discharge at the wake of the cylinder. For an elastic cylinder, the vortex-induced lift will cause the cylinder to vibrate perpendicular to the direction of fluid flow. For a rigid cylinder, the vortex-induced lift does not cause the cylinder to vibrate. This means that no matter whether the cylinder vibrates or not, the vortex-induced lift always exists. [0003] The alternating frequency of the vortex-induced lift is equal to the frequency of the vortex discharge, and the frequency of the vortex discharge depends on the velocity of the fluid flowing through the cylinder, and the magnitude of the vortex-induced lift dep...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L23/00G01M7/02
Inventor 黄维平孙铭远刘震
Owner OCEAN UNIV OF CHINA
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