Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal design of two-dimensional riser fairings for vortex-induced
  vibration suppression based on genetic algorithm   Vortex-induced vibration (VIV) manifests its destructiveness on marine risers
in deep-water oil and gas development. Many types of riser fairings are
employed in the practical applications of ocean engineering due to their
effectiveness in suppressing VIV. However, few reports have been found on the
optimal design of the fairing profile. In this study, we conduct shape
optimization by integrating computational fluid dynamics and genetic algorithm
at a low Reynolds number. The fairing profile is parameterized by B\'ezier
curves with control points adopted as design variables, and lift coefficient is
selected as the objective function to obtain optimal fairing. The optimal
solution shows that the water-drop-shaped fairing presents a high performance
in the condition of two degrees of freedom (DOFs), whereas the caudal
fin-like-shaped fairing has good stability in 3-DOF condition. Optimization
results indicate that the water-drop-shaped fairing suppresses amplitude up to
99% and reduces drag coefficient by almost 51% at Ur=5.0 for the 2-DOF
condition. For the 3-DOF condition, the formation of two symmetric vorticities
with opposite directions generated at the bilateral of the optimal fairing
leads to fairing stability in flow.

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The categories of this paper are: q-bio
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The categories of this paper are: stat
6
The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
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The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: econ