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Numerical simulation of wave dissipation property of a new-type open breakwater
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摘要: 通过改进已有的防波堤模型，建立了一种新型水平斜板透空式防波堤模型。基于VOF方法建立了波浪与水平斜板防波堤相互作用的数值模型。经数值模拟研究了该新型水平斜板防波堤结构对波浪透射系数的影响，主要考虑了斜板角度、波陡、相对板间距、相对板宽和相对出水高度等因素对防波堤消波效果的影响。模拟结果显示：①水平斜插板透空式防波堤比水平板透空式防波堤的消波效果好。在斜插板作用下，随着斜板角度增大，透射系数逐渐增大，但增幅逐渐减小；②随着波陡增大，透射系数先减后增；③随着水平板间距增加，透射系数增大；④随着防波堤相对板宽的增大，透射系数逐渐减小；⑤随着防波堤出水高度增加，透射系数先减后增。结果表明，该新型结构防波堤的消波效果显著，可以很好地消减波浪，应用前景良好。Abstract: By improving the existing models for the breakwaters, a model for the new-type horizontal-inclined-plate open breakwater is developed in this study. Based on the VOF method, a numerical model for interaction between the waves and the horizontal-inclined-plate breakwater is established. Studies of impacts of a new type of the horizontal-inclined-plate breakwater upon the wave transmission coefficients are carried out by numerical simulation. The main impacts such as the wave steepness H/L, relative plate spacing D/H, relative plate width B/L, relative freeboard d/H and inclined-plate angle on the wave dissipation effects of the breakwater have been considered in this paper. From the analysis results it is found that the above factors have great influences on the wave dissipation effects of the breakwater, and the results are as follows: ①the horizontal-inclined-plate permeable breakwater has a better wave-absorbing effect than the horizontal-plate permeable breakwater. Under the action of the inclined plate, the transmission coefficients increase with the increase in the angle of the inclined plate, but the increase magnitude gradually decreases; ②with the increase in wave steepness, the transmission coefficients decrease first and then increase; ③with the increase in horizontal-plate spacing, the transmission coefficients increase; ④with the increase in the relative plate width of the breakwater, the transmission coefficients decrease; ⑤with the increase in breakwater level, the transmission coefficients decrease first and then increase. The analysis results show that the new-type breakwater structure has remarkable effects on wave energy dissipation and has a good application prospect in ocean engineering.
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Key words:
- horizontal inclined plate /
- breakwater /
- numerical simulation /
- transmission coefficient
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图 3 不同波高条件下透射系数随斜板角度的变化
Figure 3. Variations in transmission coefficients with angle of inclined plate under different wave heights
图 4 不同水平板间距条件下透射系数随波陡的变化
Figure 4. Variations in transmission coefficients with wave steepness under different horizontal plate spacings
图 5 不同波高条件下透射系数随相对板间距的变化
Figure 5. Variations in transmission coefficients with relative plate spacing under different wave heights
图 6 不同波高条件下透射系数随相对板宽的变化
Figure 6. Vriations in transmission coefficients with relative plate width under different wave heights
图 7 不同板宽条件下透射系数随相对出水高度的变化
Figure 7. Variations in transmission coefficients with relative water outlet height under different plate widths
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