Dynamic design method of spiral strake vortex-induced vibration suppression device
A technology of spiral strakes and vortex-induced vibration, applied in design optimization/simulation, complex mathematical operations, special data processing applications, etc., can solve time-consuming calculations, high computing resource requirements, unsuitable optimization design of spiral strake structures, etc. problem, to achieve the effect of occupying less computing resources and less computing time
Pending Publication Date: 2022-05-06
海油发展珠海管道工程有限公司
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However, this method requires very high computing resources, and the calculation is very time-consuming, so it is not suitable for the optimal design of spiral strake structures in engineering
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Embodiment 1
[0108] The ocean current velocity range that the riser mainly bears is 0.25m / s~2m / s. The designed spiral strake vortex-induced vibration suppression device is as follows: figure 2 As shown, the hydraulic diameter D=508mm, the fin height is 0.25D, the pitch is 16D, the slope of the fin is 10°, and the groove width is 0.069D. The first 50 frequencies of a 1500 m long bare riser with fixed ends are calculated. image 3 The calculation results of the 27th mode are shown in .
[0109] Such as Figure 4 As shown, the riser with twice the pitch length is used as the modeling object. Figure 4 A schematic diagram of the riser structure after adding spiral strakes is shown in . The mass of the bare riser with two pitch lengths (considering the mass of the fluid medium in the pipe) is m clean = 6802.4 kg. by formula S t = f v D / U shows that when the incoming flow velocity is 0.25m / s, the subcritical interval S t ≈0.2, can be converted to f v ≈0.0985Hz. When the frequency of ...
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The invention discloses a dynamic design method of a spiral strake vortex-induced vibration suppression device. The dynamic design method comprises the following steps: determining an ocean current range; the natural vibration frequency of the vertical pipe is obtained through modal calculation; reversely deducing vortex diarrhea frequency corresponding to the minimum vortex-induced resonance excitation flow velocity according to a Storrage Haar number formula; searching the inherent frequency of the riser closest to the vortex flow frequency; the method comprises the following steps: taking a section of riser (which can be additionally provided with a spiral strake), establishing a fluid-solid coupling dynamics simulation model based on a computational fluid dynamics (CFD) method, a structural dynamics theory (CSD) and a nested grid technology, and predicting the transverse flow amplitude suppression efficiency and the dragging force coefficient of the riser section (which can be additionally provided with the spiral strake). And if the suppression efficiency and the dragging force coefficient meet the requirements, the designed spiral strake structure meets the requirements. And if the requirement is not met, redesigning the structural parameters of the spiral strake, and calculating again until the requirement is met. By adopting the method, the requirement of rapid design of the spiral strake structure in engineering can be met.
Description
technical field [0001] The invention relates to a vortex-induced vibration suppression device for a spiral strake, in particular to a dynamic design method for a vortex-induced vibration suppression device for a spiral strake. Background technique [0002] The vortex-induced vibration (VIV, vortex-induced vibration) problem of marine risers is a typical nonlinear fluid-structure interaction dynamics problem, and it is the main cause of fatigue damage of marine risers identified by the API code of the United States and the DNV code of Norway. When the vortex discharge frequency is close to the natural frequency of the standpipe, vortex-induced resonance will occur, and the amplitude will increase significantly in a certain flow velocity range, which will lead to fatigue damage of the standpipe and cause huge economic losses. [0003] In engineering, the vortex-induced vibration of the standpipe is mainly weakened by installing some turbulence devices to destroy the vortex str...
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IPC IPC(8): G06F30/23G06F30/28G06F17/11
CPCG06F30/23G06F30/28G06F17/11Y02T90/00
Inventor 杨加栋康学君张晓灵陈东阳相政乐吴文通贾振孔瑞林王铭浩张祥陆娟由乐彭传伟
Owner 海油发展珠海管道工程有限公司