Simulation of fluid-structure interaction for surface ships with linear/nonlinear deformations

Paik, Kwang-Jun

doi:10.17077/etd.vszmn6up

Cited by 4 publications

(6 citation statements)

References 76 publications

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“…On the other hand, when the standard method is implemented the resulting position of the cylinder is shifted upwards and does not agree well with the measurements. This finding is consistent with the previously discussed (see section 3.3) limitation of the standard method, which over predicts the net force acting on the structure. To quantitatively compare the accuracy of the two methods, the temporally averaged error of the position of the cylinder is calculated using the following expression:…”

Section: Force Calculation Test Case: Static Buoyant Cylinder Casesupporting

confidence: 93%

“…Some of these studies treat the problem as a single-phase flow, i.e. instead of solving for the two phases, only the water side is computed while the effect of the air is introduced by satisfying the kinematic and dynamic boundary conditions on the free surface (see for example [1,2,3]). Reducing the problem to single-phase flow, and thus neglecting the effect that the air has on the motion of the floating structure, may be a reasonable simplification in specific applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Level set immersed boundary method for coupled simulation of air/water interaction with complex floating structures

Calderer

Kang

Sotiropoulos

2014

Journal of Computational Physics

103

101

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We propose a new computational approach for simulating the coupled interaction between air-water flows and arbitrarily complex floating rigid bodies. The numerical method integrates the fluid-structure interaction (FSI) curvilinear immersed boundary (CURVIB) method of Borazjani et al. (2008) with a level set approach for simulating free surface flows in arbitrarily complex domains. We show that when applying the CURVIB method to simulate two-phase flow FSI problems the approach used to calculate the force imparted on the body is critical for determining the overall accuracy of the method. We develop and demonstrate the accuracy of a new approach for calculating the force, namely the pressure projection boundary condition (PPBC), which is based on projecting the pressure on the surface of the body using the momentum equation along the local normal to the body direction. Extensive numerical tests show that the new approach greatly improves the ability of the method to correctly predict the dynamics of the floating structure motion. To demonstrate the predictive capabilities of the method and its ability to simulate non-linear free surface phenomena, such as breaking waves, we apply it to various two and three-dimensional problems involving complex rigid bodies interacting with a free surface both with prescribed body motion and coupled FSI. We show that for all cases the proposed method yields results in very good accuracy with benchmark numerical data and available experiments. The simulations also reveal the onset of dynamically rich, energetic coherent structures in the air phase induced by the waves generated as the rigid body interacts with the free surface.

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Section: Force Calculation Test Case: Static Buoyant Cylinder Casesupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Level set immersed boundary method for coupled simulation of air/water interaction with complex floating structures

Calderer

Kang

Sotiropoulos

2014

Journal of Computational Physics

103

101

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show abstract

“…In this work, a blended k−ω /k−ε model for turbulence and dynamic overset grids to resolve large amplitude motions were used (Carrica, et al, 2007, Paik, 2010. For large deformations, a nonlinear structure solver based on the FEM (Bhatti, 2006) was applied.…”

Section: Methodsmentioning

confidence: 99%

Multi-Physics Coupled FEM Method to Simulate the Formation of Crater-Like Taylor Cone in Electrospinning of Nanofibers

Liu

Tian

et al. 2014

JNanoR

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Crater-like Taylor cone electrospinning is a novel, simple, and powerful approach to mass produce nanofibers. The Taylor cone, crater-like liquid bump on the free liquid surface, in this electrospinning process plays a key role to produce multiple fluid jets which finally solidifies nanofibers. A multi-physics coupled FEM method was employed to simulate the dynamic formation process of crater-like Taylor Cone in crater-like electrospinning. A blended k−ω /k−ε model for turbulence and dynamic overset grids to resolve large amplitude motions were used to simulate two-dimensional uncompressed flow, which was described in axisymmetrical coordinates. The numerical calculation results were obtained by a computational fluid dynamics (CFD) method. The effect of gas flow on the formation of crater-like Taylor cone and the production of nanofibers were also discussed. The experiments were carried out to validate the numerical results. The Polyvinyl Alcohol (PVA)/ distilled water solution with 18wt% and the air pressures ranged varied from 4 to 50kPa were used in our experiments. The results showed that the numerical results were in good agreement with the experimental results. This work provides a deep understanding of the mechanisms of micro fluid jets production in electrospinning processes and two-phase flow in specific type of industrial equipment.

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“…The mode superposition is applied, assuming small deformation response so that the modal responses are independent of each other. The elastic degrees of freedom in terms of the added-mass of water over the ship's hull should be accounted, which corresponds to results from "Wet modes" (Paik, 2010). Fluid structure interaction by accounting for added mass effects in transient dynamic slamming response is described briefly by Thomas et al (2003).…”

Section: Introductionmentioning

confidence: 99%

Whipping response analysis by one way fluid structure interaction—A case study

et al. 2015

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Simulation of fluid-structure interaction for surface ships with linear/nonlinear deformations

Abstract: Interior grid near the bar surface of the fluid boundary layer gird for Case 3: initial grid (top) and deformed grid (bottom) .

Cited by 4 publications

References 76 publications

Level set immersed boundary method for coupled simulation of air/water interaction with complex floating structures

Level set immersed boundary method for coupled simulation of air/water interaction with complex floating structures

Multi-Physics Coupled FEM Method to Simulate the Formation of Crater-Like Taylor Cone in Electrospinning of Nanofibers

Whipping response analysis by one way fluid structure interaction—A case study

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