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Ocean Systems Engineering Volume 9, Number 3, September 2019 , pages 241-259 DOI: https://doi.org/10.12989/ose.2019.9.3.241 |
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VIV simulation of riser-conductor systems including nonlinear soil-structure interactions |
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Maokun Ye and Hamn-Ching Chen
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| Abstract | ||
| This paper presents a fully three-dimensional numerical approach for analyzing deepwater drilling riser-conductor system vortex-induced vibrations (VIV) including nonlinear soil-structure interactions (SSI). The drilling riser-conductor system is modeled as a tensioned beam with linearly distributed tension and is solved by a fully implicit discretization scheme. The fluid field around the riser-conductor system is obtained by Finite-Analytic Navier-Stokes (FANS) code, which numerically solves the unsteady Navier-Stokes equations. The SSI is considered by modeling the lateral soil resistance force according to nonlinear p-y curves. Overset grid method is adopted to mesh the fluid domain. A partitioned fluid-structure interaction (FSI) method is achieved by communication between the fluid solver and riser motion solver. A riser-conductor system VIV simulation without SSI is firstly presented and served as a benchmark case for the subsequent simulations. Two SSI models based on a nonlinear p-y curve are then applied to the VIV simulations. Also, the effects of two key soil properties on the VIV simulations of riser-conductor systems are studied. | ||
| Key Words | ||
| CFD simulation; vortex induced vibrations; fluid-structure interaction; nonlinear soil-structure interaction; riser-conductor system | ||
| Address | ||
| Maokun Ye: Department of Ocean Engineering, Texas A&M University, USA Hamn-Ching Chen: Zachry Department of Civil Engineering and Department of Ocean Engineering, Texas A&M University, USA | ||
