Prediction of ship motions via a three-dimensional time-domain method following a quad-tree adaptive mesh technique

• Autorzy: Zhang T. , Ren J. , Liu L.
• Języki publikacji: EN

Abstrakty

EN

A three-dimensional (3D) time-domain method is developed to predict ship motions in waves. To evaluate the FroudeKrylov (F-K) forces and hydrostatic forces under the instantaneous incident wave profile, an adaptive mesh technique based on a quad-tree subdivision is adopted to generate instantaneous wet meshes for ship. For quadrilateral panels under both mean free surface and instantaneous incident wave profiles, Froude-Krylov forces and hydrostatic forces are computed by analytical exact pressure integration expressions, allowing for considerably coarse meshes without loss of accuracy. And for quadrilateral panels interacting with the wave profile, F-K and hydrostatic forces are evaluated following a quad-tree subdivision. The transient free surface Green function (TFSGF) is essential to evaluate radiation and diffraction forces based on linear theory. To reduce the numerical error due to unclear partition, a precise integration method is applied to solve the TFSGF in the partition computation time domain. Computations are carried out for a Wigley hull form and S175 container ship, and the results show good agreement with both experimental results and published results

• Wydawca: -
• Czasopismo: Polish Maritime Research
• Rocznik: 2020
• Tom: 27
• Numer: 1
• Opis fizyczny: p.29-38,fig.,ref.

Twórcy

autor

Zhang T.

• Dalian Maritime University, 1 Linghai Road, 116026 Dalian, China

autor

Ren J.

• Dalian Maritime University, 1 Linghai Road, 116026 Dalian, China

autor

Liu L.

• Dongbei University of Finance and Economics, 217 Jianshan Street, Shahekou District, 116025 Dalian, China

Bibliografia

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Identyfikatory

DOI

10.2478/pomr-2020-0003