Physics-Based Simulation of Ocean Scenes in Marine Simulator Visual System

Li, Haijiang; Ren, Hongxiang; Qiu, Shaoyang; Wang, Chang

doi:10.3390/w12010215

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…All the rigid bodies, including the bounding box were sampled as boundary particles using Poisson Disk Sampling method [46]. The single layer nonuniform boundary particle model [47] is adopted to deal with the two-way coupling between boundary particles and fluid particles. In all test ocean scenarios, the adaptive time step [45] is adopted unless stated otherwise.…”

Section: Resultsmentioning

confidence: 99%

A Unified Anisotropic Particle-Based Ocean Wave Simulation Framework for Marine Simulator Visual System

Ren

Wang

et al. 2020

IEEE Access

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It is urgent to improve the physical reality of ocean scenes in marine simulator for the maritime industry. In this paper, we propose a unified anisotropic particle-based ocean wave simulation framework for marine simulator. In the unified framework, a novel hybrid SPH method is applied to model the ocean waves, which combines a series of nonlinear density constraints and divergence-free velocity field constraints. By solving density constraints, the particle position distribution is directly adjusted to keep a constant density. Experiments show that the hybrid SPH method has advantages in compressibility and stability. Moreover, a novel stochastic fluctuating wind field model is integrated into the hybrid SPH method. The Perlin noise and a modified log wind profile are introduced to enrich the details of wind field. We also introduce a novel oil spill model for marine simulator based on number density, which can achieve a desired sharp density changes at interfaces between multiple fluids. For real-time surface reconstruction, we propose an improved anisotropic particle transformation method based on the distribution of the neighboring particles. The problem of particle deformation near the boundary is solved by our piecewise correction function, with the sharp features and anisotropy maintained. When calculating the covariance matrix and weighted position, the contribution of neighboring particles in other fluid phases is considered to eliminate gaps between multiple fluids in the oil spill scenes. The simulation results show that our unified anisotropic framework based on the SPH concept can easily integrate other models, has strong expansibility, and is very applicable to simulate complex ocean scenes. INDEX TERMS marine simulator, SPH, ocean wave, wind field, oil spill, anisotropic transformation.

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Section: Resultsmentioning

confidence: 99%

A Unified Anisotropic Particle-Based Ocean Wave Simulation Framework for Marine Simulator Visual System

Ren

Wang

et al. 2020

IEEE Access

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“…The authors of paper [7] investigated the realistic simulation of ocean scenes, improving a smoothed particle hydrodynamics (SPH) model. The solver combines nonlinear constant density constraints and a divergence-free velocity field constraint.…”

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Hydraulic Dynamic Calculation and Simulation

Aricò

2021

Water

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An Improved Meshless Divergence-Free PBF Framework for Ocean Wave Modeling in Marine Simulator

Ren

Duan

et al. 2020

Water

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It is a challenging work to simulate wind and waves in virtual scenes of marine simulators. In this paper, a divergence-free position based fluid (DFPBF) framework is introduced for ocean wave modeling in marine simulators. We introduce a set of constant density constraints and divergence-free velocity constraints to enforce incompressibility. By adjusting the position distribution of fluid particles, the particle density is forced to be constant. Constraining the divergence-free velocity field can keep the density change rate at zero. When correcting the position and velocity of particles, we introduced a relaxation correction scheme to accelerate the convergence of the framework. The simulation results show that as the scene scale expands and the number of fluid particles increases, this acceleration effect will be more significant. Secondly, we propose a novel particle-based three-dimensional stochastic fluctuating wind field. The Perlin noise is introduced to disturb the constant horizontal wind field to form a stochastic wind field. On this basis, a stochastic fluctuating wind field simulation framework is proposed. By adjusting the pulse period and pulse width, users can flexibly control the fluid turnover under the action of the wind field. This wind field framework can be easily integrated into the DFPBF model. Based on this wind field model, we simulated some typical wind wave scenarios, including interaction scenarios with lighthouse and lifebuoy, and verified the effectiveness of the wind field model.

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Physics-Based Simulation of Ocean Scenes in Marine Simulator Visual System

Cited by 3 publications

References 38 publications

A Unified Anisotropic Particle-Based Ocean Wave Simulation Framework for Marine Simulator Visual System

A Unified Anisotropic Particle-Based Ocean Wave Simulation Framework for Marine Simulator Visual System

Hydraulic Dynamic Calculation and Simulation

An Improved Meshless Divergence-Free PBF Framework for Ocean Wave Modeling in Marine Simulator

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