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The prediction accuracy and control effectiveness of hydrodynamic noise for underwater vehicles directly impact their overall performance. Accurately grasping the distribution characteristics of pulsating pressure is the fundamental and critical basis for assessing hydrodynamic noise levels and conducting low-noise design. This study takes an axisymmetric underwater structure as the research object, conducts numerical simulations of pulsating pressures based on Large Eddy Simulation (LES), and analyzes their distribution patterns in different regions. Using the Q-criterion, the vortex structures in various typical regions of the axisymmetric structure are captured and the characteristics of pulsating pressures in each region are analyzed in conjunction with vorticity distribution. By comparing the simulated pulsating pressure results with experimental data, the accuracy of the simulation method was verified. Based on this, research on pulsating pressure control methods in the flank array region of an underwater vehicle was conducted, and it proposes adding a guide fillet at the transition position between the front end of the flank array and the hull. The study shows that this measure can effectively suppress the horseshoe vortex induced by the geometric discontinuity of the flank array, reducing the overall pulsating pressure level at typical locations by over 5 dB.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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