Numerical investigation on a container ship navigating in irregular waves by a fully nonlinear time domain method. (1st March 2021)

• Record Type: Journal Article
• Authors: Tang, Ying; Sun, Shi-Li; Ren, Hui-Long
• Is Part Of: Ocean engineering. Volume 223(2021)
• Publication Date: 2021-03-01
• Subjects: Wave-body interaction -- Fully nonlinear boundary conditions -- MEL method -- Auxiliary functions method -- Irregular waves; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2021.108705
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: A three dimensional fully nonlinear time domain method is introduced to simulate ship advancing in regular and irregular waves with forward speed. The mixed Eulerian-Lagrangian (MEL) method and boundary element method are adopted to solve the boundary value problem. Spring analogy method is utilized to guarantee the optimization mesh of the transient free surface and wetted hull body. A local coordinate system is introduced, and the fully nonlinear disturbed wave is separated from the total wave. Auxiliary functions are deduced to decouple the strongly nonlinear hydrodynamic forces and ship motion. Then the motion and velocity potential can be updated with the fourth-order Runge Kutta method. A 13500 TEU container ship is chosen to verify the numerical codes, the numerical results in regular waves and irregular waves are both in good agreement with experimental data. The instantaneous pressure distribution around wetted body surface and wave elevation on the free surface of dangerous moments are presented and the strongly nonlinear states in the harsh irregular waves are analyzed. Highlights: A 3D fully nonlinear time domain method is presented to simulate ship advancing in waves with forward speed. The present numerical results coincide well with experimental data in regular and irregular waves. Cases of airy waves, 5th stokes waves as well as irregular waves are simulated and analyzed. Tranisient pressure distribution and wave elevation are studied, nonlinearity in harsh irregular waves are analyzed.