Bionic sharkskin resistance reduction control method for marine riser
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A control method, shark skin technology, applied in design optimization/simulation, instrumentation, sustainable transportation, etc., to achieve the effects of ensuring stable convergence, reducing analysis difficulty, and overcoming unreasonable time steps
Active Publication Date: 2022-07-12
SOUTHWEST PETROLEUM UNIV
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[0005] The invention provides a bionic shark skin drag reduction control method for marine risers to solve the technical problem of overcoming vortex-induced vibrations in marine risers in the prior art, and to provide engineering solutions for marine risers to overcome vortex-induced vibrations based on the principle of bionics. The purpose of feasible technical means
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Embodiment 1
[0090] like figure 1 The shown bionic shark skin drag reduction control method for marine risers includes the following steps:
[0091] Step S1, establishing a cylindrical three-dimensional numerical model with a bionic shark skin surface;
[0092] Step S2, setting the fluid computational domain, and determining the boundary conditions;
[0093] Step S3, dividing a hexahedral mesh;
[0094] Step S4, verify the mesh independence: if the mesh independence verification passes, go to the next step; if the mesh independence verification fails, re-divide the hexahedral mesh;
[0095] Step S5, verifying the numerical model: if the verification of the numerical model passes, go to the next step; if the verification of the numerical model fails, re-establish the three-dimensional numerical model of the cylinder;
[0096] Step S6, using the large eddy simulation method to perform numerical simulation, calculating the root mean square of the lift coefficient and the average value of ...
Embodiment 2
[0099] A marine riser bionic shark skin drag reduction control method, the detailed process is as follows:
[0100] (1) Establishment of a cylindrical 3D numerical model with a bionic shark skin surface
[0101] A standard cylindrical model with a diameter of D and a height of 8D is established; in this embodiment, D=40mm;
[0102] like figure 2 As shown, n arc-shaped grooves uniformly distributed along the circumference are opened on the outer wall of the standard cylinder, and the axis of the arc-shaped groove is parallel to the standard cylinder; wherein 14≤n≤30, and n is an even number;
[0103] like image 3 As shown, the radial depth h and chord length d of the arc-shaped groove are set; wherein: 0.0025D≤h≤0.01D, d is a fixed value, in this embodiment, d=0.07D=2.8mm.
[0104] (2) Set up the fluid computational domain and determine the boundary conditions
[0105] The fluid computational domain is set as a cuboid whose length, width and height are 26D, 12D, and 8D re...
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Abstract
The invention discloses a bionic sharkskin resistance reduction control method for a marine riser. The method comprises the following steps: establishing a cylindrical three-dimensional numerical model with a bionic sharkskin surface; setting a fluid computational domain, and determining boundary conditions; dividing a hexahedral mesh; the grid independence is verified; verifying the numerical model; carrying out numerical simulation by adopting a large vortex simulation method, calculating a lift coefficient mean square root and a resistance coefficient average value based on a simulation result, and collecting a flow field vorticity and a three-dimensional vortex structure; according to the lift coefficient mean square root, the resistance coefficient average value, the flow field vorticity and the three-dimensional vortex structure, the resistance reduction effect is evaluated; and if the resistance reduction effect does not meet the set requirement, the cylindrical three-dimensional numerical model is re-established. The invention provides a bionic sharkskin resistance reduction control method for a marine riser, so as to solve the technical problem of overcoming vortex-induced vibration of the marine riser in the prior art and achieve the purpose of providing a technical means with engineering feasibility for overcoming vortex-induced vibration of the marine riser based on a bionic principle.
Description
technical field [0001] The invention relates to the field of offshore oil and gas development, in particular to a bionic shark skin drag reduction control method for marine risers. Background technique [0002] With the gradual strengthening of the exploration of offshore oil and gas resources and the deepening of the drilling depth, there are more and more technical problems to be solved in the development of offshore oil and gas. For drilling / oil production platforms / ships, the riser is an important channel connecting the subsea wellhead and the offshore platform. The riser is inserted below the mud surface to isolate the seawater to form the drilling and production annulus. The riser can be divided into rigid and flexible, which can be applied to jack-up platform, semi-submersible / floating platform respectively. No matter what kind of riser, vortex-induced vibration is a problem that it needs to face. [0003] Vortex-induced vibration in this field is that when the ocean...
Claims
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