As a critical component of the miner, the front collector directly relates to the miner's working performance. The collection form of the front collector includes the mechanical type [10], the hydraulic type [11] and the compound mechanical-hydraulic type [5]. Currently, the hydraulic type collector has been widely applied due to its advantages of high efficiency, great environmental protection, and low cost [12]. Researchers have carried out a large number of studies on the collection mechanism of polymetallic nodule hydraulic collectors through experimental tests and numerical simulations. [PERSON] et al. [13] manufactured a hydraulic collector with water-jet piping and baffle plates. They also analyzed the collection efficiency of the hydraulic collector through experimental tests, and an operation condition with high collection efficiency was identified. [PERSON] and [PERSON] [14] designed a hydraulic collector consisting of two rows of jet nozzles and a conducting nozzle. The influence of the main parameters of this collector on the mining performance was explored through experimental tests. The geometric considerations and related power consumption were provided in their research. [PERSON] et al. [15] analyzed the flow field characteristics with outflow discharge from a collecting device in deep seawater while gathering manganese nodules through computational fluid dynamics simulation. [PERSON] et al. [16] adopted the CFD-DEM method to establish a solid-liquid two-phase flow model in which a single particle leaves the ground and enters the lifting pipe under the action of suction from the vertical pipe. Through this, the flow field and motion state of the single particle was explored. [PERSON] et al. [17] studied and analyzed the operating performance of three different types of hydraulic collectors, and they found that the Coanda-effect-based hydraulic collector has the most promising application due to its combination of low energy consumption and small flow field disturbances. [PERSON] et al. [18] conducted a study on the shape of ellipsoidal polymetallic nodules on the collection suction force. By adopting the particle image velocimetry (PIV) technique and numerical method, [PERSON] et al. [19] investigated the flow velocity distribution of two polymetallic-nodule-collecting devices. [PERSON] et al. [20] conducted a theoretical analysis and numerical simulation study of a Coanda effect-based hydraulic collector, and they found that the Coanda effect became stronger  
Figure 1: Polymetallic nodules. Figure 2: Miner for the collection of polymetallic nodules. with increasing initial velocity, increasing non-dimensional jet slot height, and decreasing non-dimensional wall height. [PERSON] et al. [21] also investigated the new Coanda effect-based hydraulic polymetallic nodule collector with a logarithmic spiral surface. [PERSON] and [PERSON] [22] studied the erosion phenomenon of deep-sea sediments during nodule collection by a Coanda-effect-based hydraulic collector. On this basis, [PERSON] et al. [23] developed and designed a Coanda-effect-based hydraulic polymetallic nodule collector, as well as conducted CFD numerical analysis and experimental tests. The results showed that the designed collector can realize collection operations with high collection efficiency and low deep-sea sediment disturbance. With the resolved computational fluid dynamics discrete element method, [PERSON] et al. [24] investigated the motion characteristics of the coarse particles during the hydraulic collecting process. The essential role of a hydraulic collector is to aggregate the polymetallic nodules located on the seabed and to store them in a container on the mining vehicle for transportation to the sea surface through a pipeline. Therefore, the hydraulic collector needs to perform the two functions of peeling and lifting the nodules from the seabed, as well as transporting the nodules to the container in the mining vehicle.