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  Numerical Study on Conceptualized Cross -sections Hydrodynamic Characteristics of

  Submerged floating tunnel (SFT) may suffer from currents and waves long-term actions. Studies have indicated that optimizing SFT cross-section shape could reduce these impacts. This paper further proposed various conceptualized SFT cross-sections and quantitatively analyzed their hydrodynamic characteristics using numerical approaches. Findings are that the chamfer, arched top edge, or guide flow device of cross-section are useful ways to reduce hydrodynamic loads. Though the flow forces of streamlined cross-sections are relatively smaller, the sections vortexes shedding is probably higher-frequency, which may pose the risk of resonance. The asymmetry crosssections with the arched top edges receive a higher overturning moment.

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