## 1 Introduction  
The challenging and intricate nature of oceanic environments complicates direct human intervention in surveys. Therefore, autonomous underwater vehicles (AUVs) have become vital tools for achieving efficient and convenient oceanic monitoring [1]. Equipped with a variety of sensors, AUVs can perform diverse tasks in civilian applications, including mine surveys, environmental monitoring, underwater equipment maintenance, and hydrological surveys [2; 3; 4]. In the execution of underwater exploration research, the turbulent boundary layer (TBL) and turbulent interference occur in AUVs due to the high Reynolds numbers and complex oceanic environments. The flow noise caused by AUVs not only increases energy consumption during the working process, but also undermines their accuracy and system stability, thereby decreasing the signal-to-noise ratio as the propulsion speed increases [5; 6; 7; 8]. Additionally, along with gradually reducing the mechanical noise of AUVs, flow noise has become one of the main sources of noise. Further studies indicate that low-frequency vibrations induced by flow noise reduce the stability of marine engineering equipment and compromise its stealth characteristics, thereby increasing the risk to sustainable development [9; 10; 11]. Therefore, in order to further enhance the requirements of geological exploration, it is necessary to reduce the flow noise of AUVs. The current research on mitigating the flow noise of AUVs is primarily classified into two categories. Some researchers approach the problem by employing structural designs that aim to diminish resistance and subsequently flow noise as the AUVs progresses. Notably, [PERSON] [12] utilizes the study and modeling of the physical dimensions of the humpback whale to propose a bionic hull shape for AUVs. This design is purported to be highly suitable for extended-distance and high-speed applications. Additionally, [PERSON] [13] conceptualized a multidisciplinary design optimization framework and applied it to a 200 kg AUV with the goal of maximizing its endurance. [PERSON] [14] designed a single flexible side fin with adequate proportions and stiffness for the energy-saving propulsion system of biomimetic unmanned underwater vehicles, further improving the mechanical performance of the system. Researchers have focused on the overall structural design of AUVs, reducing overall flow noise from a structural design perspective. Nowadays, biomimetic surfacing, designs that replicate the morphology of biological surfaces, has been introduced to reduce flow noise. Researchers utilize bionic design approaches to modify the skin of the interaction surface, aiming to reduce low-frequency flow noise. [PERSON] [15] reports on the experimental investigation of the effect of sinusoidal riblets on the near-wall characteristics of the TBL. Direct numerical simulation results demonstrate a notable decline in energy levels at separation area [16]. In the comparative analysis of flow and noise control studies, [PERSON] [17] concluded that micro-grooves could decrease drag, and speculated that a reduction in TBL energy could subsequently result in a decrease in internal noise. The initial research exploring noise reduction with micro-grooving was conducted by [PERSON] and [PERSON] [18], researchers have applied micro-groove surface coatings to ships to conduct experiments on drag reduction and noise minimization, and obtained noise reduction results. Later, [PERSON] [19] utilized the Northwestern Polytechnical University's water hole to investigate flow noise from underwater vehicles with biomimetic surfaces, where researchers found that noise reduction could reach up to 5 dB. In research aimed at reducing flow noise by utilizing surfaces as research objects, several comprehensive studies have delved into many noise reduction technologies derived from shark skin [20; 21].