Parameter computation for a Lagrangian mechanical system model of a submerged vessel moving near a free surface

Jung, Seyong; Brizzolara, Stefano; Woolsey, Craig A.

doi:10.1016/j.oceaneng.2021.108988

Cited by 4 publications

(2 citation statements)

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“…The boundary element method (BEM), Aegir [16], has been used in the past for the computation of parameters used in the LNMS model [7,8]. Aegir is a high-order timedomain Rankine-source BEM (using third-order B-splines for panel geometry and source distribution) that is able to include the effects of a free surface.…”

Section: Boundary Element Methodsmentioning

confidence: 99%

“…A framework for the LNMS model was developed from first-principle energy considerations by Battista et al using potential flow formulations [2,5,6]. The model was further reformulated to allow for parameter computation using a three-dimensional boundary element method (BEM) [7,8]. The reformulation process enabled the direct use of fluid potential functions generated by a boundary element method to populate the coefficient-based LNMS model.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of a Linear Free Surface Boundary Condition on the Steady-State Wave-Making of Shallowly Submerged Underwater Vehicles

Lambert

Brizzolara

Woolsey

2023

JMSE

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Near-surface simulation methods for shallowly submerged underwater vehicles are necessary for the population of a variety of free-surface-affected, coefficient-based maneuvering and seakeeping models. Simulations vary in complexity and computational costs, often sacrificing accuracy for simplicity and speed. One particular simplifying assumption, the linearization of the free surface boundary conditions, is explored in this study by comparing the steady-state wave-making characteristics of a shallowly submerged prolate spheroid using two different simulation methods at several submergence depths and forward speeds. Hydrodynamic responses are compared between a time-domain boundary element method that makes use of a linearized free surface boundary condition and an inviscid, volume of fluid Reynolds-Averaged Navier–Stokes computational fluid dynamics code that imposes no explicit free surface boundary condition. Differences of up to 22.6%, 32.5%, and 33.3% are found in the prediction of steady state surge force, heave force, and pitch moment, respectively. The largest differences between the two simulation methods arise for motions occurring at small submergences and large wave-making velocities where linear free-surface assumptions become less valid. Nonlinearities that occur in such cases are revealed through physical artifacts such as wave steepening, wave breaking, and high-energy waves. A further examination of near-surface viscous forces reveals that the viscous drag on the vessel is depth dependent due to the changing velocity profile around the body.

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Section: Boundary Element Methodsmentioning

confidence: 99%