Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles
Abstract
:1. Introduction
2. Methodology
2.1. Governing Equations
2.2. Free Surface Capture
2.3. Numerical Wave Tank
2.4. Boundary Conditions
- (i)
- At the inlet boundary, the velocity for the water is given according to the wave theory, while the air velocity is zero. The pressure is set as a zero normal gradient boundary condition.
- (ii)
- At the outlet of the domain, the velocities for both water and air are set to zero. The zero normal gradient condition is applied for the pressure.
- (iii)
- At the top boundary, the velocity for the inflow is calculated from the flux in the patch-normal direction. The velocity for the outflow is set as the zero normal gradient boundary condition. The patch pressure on the top boundary is obtained by subtracting the dynamic pressure from the total pressure, expressed as follows,
- (iv)
- The no-slip condition is employed in four boundaries, i.e., front, back, bottom, and the cylinder’s surface, where the velocity is zero. Meanwhile, the wall functions are employed on these boundaries. The distance of the first layer center to the wall is 0.002 D, where D is the diameter of the cylinder. It ensures that the dimensionless wall distance for the present simulation is at the range of 40–200.
2.5. Calculation of Wave Forces
2.6. Numerical Scheme
3. Numerical Implementation
3.1. Setup of the Numerical Wave Tank
3.2. Grid and Time-Step Refinement Studies
4. Results
4.1. Validation of the Numerical Model
4.1.1. Comparisons of the Present Numerically Simulated Results with the Published Data for a Vertical Cylinder
4.1.2. Comparisons of the Present Numerically Simulated Results with the Published Data for an Inclined Cylinder
4.2. Characteristics of the Free Surface Elevations and the Breaking Wave Forces on the Standing Cylinder with Different Transverse Inclined Angles
4.3. The Processes of Breaking Waves past the Cylinder
5. Conclusions and Future Work
Author Contributions
Funding
Conflicts of Interest
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Case | Transverse Inclined Angle θ (°) |
---|---|
A | 0 |
B | 15 |
C | 30 |
D | 45 |
E | 60 |
F | 75 |
Mesh | Near the Cylinder (m) Max(Δx, Δy, Δz) | At Wave Generator (m) Max(Δx, Δy, Δz) | Number of Total Grids |
---|---|---|---|
Coarse mesh | (0.12, 0.1, 0.08) | (0.15, 0.10, 0.08) | 5,791,152 |
Medium mesh | (0.10, 0.06, 0.05) | (0.12, 0.08, 0.05) | 7,787,600 |
Fine mesh | (0.08, 0.06, 0.045) | (0.10, 0.08, 0.045) | 8,564,864 |
Case | Total Horizontal Wave Forces FT (N) | Low-Order Wave Forces FL (N) | High-Order Wave Forces FH (N) |
---|---|---|---|
A | 11,952 | 4554 | 7458 |
B | 8103 | 4058 | 4605 |
C | 8793 | 4459 | 4962 |
D | 9553 | 5161 | 4963 |
E | 14228 | 6957 | 8200 |
F | 25,965 | 13,213 | 15,016 |
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Qu, S.; Liu, S.; Ong, M.C.; Sun, S.; Ren, H. Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles. Appl. Sci. 2020, 10, 1347. https://doi.org/10.3390/app10041347
Qu S, Liu S, Ong MC, Sun S, Ren H. Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles. Applied Sciences. 2020; 10(4):1347. https://doi.org/10.3390/app10041347
Chicago/Turabian StyleQu, Sen, Shengnan Liu, Muk Chen Ong, Shuzheng Sun, and Huilong Ren. 2020. "Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles" Applied Sciences 10, no. 4: 1347. https://doi.org/10.3390/app10041347
APA StyleQu, S., Liu, S., Ong, M. C., Sun, S., & Ren, H. (2020). Numerical Simulation of Breaking Wave Loading on Standing Circular Cylinders with Different Transverse Inclined Angles. Applied Sciences, 10(4), 1347. https://doi.org/10.3390/app10041347