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Optimizing the Aquaculture Net Washer's Washing System

Ghahremani Saheb Divan, Mohammad Reza | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57991 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Khorasanchi, Mahdi; Mehdigholi, Hamid
  7. Abstract:
  8. In this project, experimental investigation and optimal design of the aquaculture netwasher process for biofouling removal have been studied. In the first phase, various types of marine biological deposits and their characteristics were examined, and the most prevalent type with the highest adhesion was selected for the net. In the second phase, different cleaning methods were evaluated, and the most efficient method considering cost, equipment, and speed was chosen. Following an assessment of the challenges, advantages, and disadvantages of the mentioned methods, a rotational disk system was selected as the preferred system due to its cost-effectiveness, cleaning speed, reduced damage to cage net, and energy efficiency. Subsequently, field experiments were conducted to assess the method's impact on fish cage fouling. In the third phase, numerical modeling using Simcenter STAR-CCM+ and employing the CFD-DEM approach simulated the biofouling removal process. The influence of key parameters on cleaning speed, including robot speed, nozzle angle, and nozzle quantity, was analyzed. For experimental trials in this study, the Aqua Insight netwasher robot was designed and fabricated. Field experiments were conducted on active cages at Bandar Aftab. The maximum modeling error compared to experimental results was 16.445%, with the minimum calculated error being 7.702%. Specifically, in terms of cleaning width, the maximum error was 55 mm, and the minimum error was 32 mm. The most significant discrepancy encountered was in the adhesion level of ship-fouling, attributed to differences in the adhesion methodology between numerical and experimental modeling. Among nozzle quantities of 3, 4, and 5, and angles of 30°, 38.5°, 45°, and 60°, the maximum cleaned width values in numerical modeling for nozzle angle 45° and nozzle quantity 5 at transfer speeds of 0.5 and 1 m/s were identified. Under these conditions, the cleaned widths were measured as 0.56034 and 0.58083 meters, respectively. The parameter of nozzle quantity demonstrated the greatest influence under constant nozzle angle and transfer speed conditions. Time savings in the cleaning operations of actual cage dimensions using the optimized disk and robot speeds of 1 and 0.5 m/s were determined to be 21.5 and 10.5 hours, respectively
  9. Keywords:
  10. Floating Fish Cage ; Biofouling ; Robot ; Optimization ; Fishes ; Netwasher Robot ; Aquaculture

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