Time-Domain Simulation of Lifting Bodies Acting at or Near the Free Surface with Vortex Particle Wakes

Stephanie Fitzpatrick (1) , Rachel Gouveia (1) , Amanda Costa (1) , David Kring (1)

1 Navatek LTD

Boundary Element Method (BEM) potential-flow solvers are regularly used in industrial applications due to their quick setup and computational time. In aerodynamics, Vortex Particle Methods (VPM) are widely used with BEM potential-flow solvers for modeling lift. However, they are seldom applied to the ocean environment. This paper discusses the implementation of a VPM into Aegir, an existing time-domain, seakeeping, medium-fidelity, BEM potential-flow solver. The wake in the VPM is modeled using both a small dipole buffer wake sheet as well as vortex particles. It has been observed that this method captures both the details of complex wake patterns behind lift-producing surfaces and the expected lift force, thus improving the accuracy of the solution. Two new contributions presented in this paper include the extension of the VPM from previous source-based methods to a potential formulation and full interaction with free surface waves.

Mots clés: Vortex Particle Method; Aegi; Potential Flow

Domaines: Mécanique des structures [physics.class-ph]

Stephanie Fitzpatrick, Rachel Gouveia, Amanda Costa, David Kring. Time-Domain Simulation of Lifting Bodies Acting at or Near the Free Surface with Vortex Particle Wakes. 17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2017), Dec 2017, Maui, United States. ⟨hal-02981061⟩