A Ghost-Cell Immersed Boundary Method for Wave–Structure Interaction Using a Two-Phase Flow Model
Abstract
:1. Introduction
2. Numerical Model
2.1. Governing Equation
2.2. Level Set Method
2.3. Numerical Scheme Based on Projection Method
2.4. Evaluation of Forcing Term and Ghost Cell
2.5. The Numerical Procedure
- Equation (9) is solved to obtain the intermediate velocity without consideration of the forcing term . However, at this moment does not satisfy the boundary condition at the rigid body surface.
- The velocity at the forcing point is computed using the interpolation method and hence the forcing term in Equation (12) is obtained.
- Equation (9) is recalculated to provide a new . As the forcing term and intermediate velocity are implicit variables, an iterative scheme between steps 2 and 3 is used to ensure the convergence of both and .
- Pressure is computed via the Pressure Poisson equation of Equation (10).
- The velocity is corrected using Equation (11).
- In the successive time step, the velocity, forcing function, and pressure calculated from the previous time step are employed to be the initial conditions. The above explained procedure is iterated until the required time step is completed.
3. Results and Discussion
3.1. Monochromatic Wave Generations
3.2. Wave Transformation Over a Trapezoidal Submerged Breakwater
3.2.1. Validation
3.2.2. Wave Transformation with Three Wavelengths
3.3. Progressive Waves Over Three Types of Submerged Breakwaters
3.3.1. Wave Transformations
3.3.2. Velocity Patterns Around the Objects
3.3.3. Simulations of Drag and Lift Forces
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Tsai, Y.-S.; Lo, D.-C. A Ghost-Cell Immersed Boundary Method for Wave–Structure Interaction Using a Two-Phase Flow Model. Water 2020, 12, 3346. https://doi.org/10.3390/w12123346
Tsai Y-S, Lo D-C. A Ghost-Cell Immersed Boundary Method for Wave–Structure Interaction Using a Two-Phase Flow Model. Water. 2020; 12(12):3346. https://doi.org/10.3390/w12123346
Chicago/Turabian StyleTsai, Yuan-Shiang, and Der-Chang Lo. 2020. "A Ghost-Cell Immersed Boundary Method for Wave–Structure Interaction Using a Two-Phase Flow Model" Water 12, no. 12: 3346. https://doi.org/10.3390/w12123346