Transient Numerical Study to Determine the Effect of Inlet Angle Variation on Flow Conditions inside a Circular Aquaculture Tank

  • Ahmad Wali El-Haq Department of Mechanical & Industrial Engineering, Faculty of Engineering, Universitas Gadjah Mada
  • Ryan Anugrah Putra Department of Mechanical & Industrial Engineering, Faculty of Engineering, Universitas Gadjah Mada
Keywords: Recirculating Aquaculture System, CFD, Circular Tank, Numerical Study, Inlet Angle


Seeing how great the contribution and potential of the aquaculture sector to the fulfillment of food for the people of Indonesia, the development of aquaculture including the Recirculating Aquaculture System (RAS) is very important to be carried out intensively. An important aspect that should be considered for the development of RAS is maintaining water quality as the main medium of cultivation. Optimization of the aquaculture tank is an effort that can be conducted to achieve this goal. A transient numerical study to determine the effect of inlet angle variation on flow conditions inside a circular aquaculture tank was conducted to assess the optimum geometry for the application. Single-phase CFD simulations using the k-ω SST turbulent model were carried out to evaluate the effect of inlet nozzle angle variations. Three angle variations 0°, 45°, and 90° were selected and the resultant fluid flow conditions were analyzed. From the CFD results, it can be known that the optimum condition for the circular aquaculture tank is achieved for the angle 0° among the tested angle in this present study.


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Subdirektorat Statistik Demografi, “Proyeksi Penduduk Indonesia 2015-2045,” BPS RIBPS-Stat. Indones., 2015.

P. Oki, “Konservasi perairan sebagai upaya menjaga potensi kelautan dan perikanan indonesia,” Dir. Jenderal Pengelolaan Ruang Laut, 2020, Accessed: Oct. 12, 2022. [Online]. Available:

L. Napitupulu et al., “Trends in Marine Resources and Fisheries Management in Indonesia: A Review,” Dec. 2022, Accessed: Apr. 28, 2023. [Online]. Available:

R. Waite and M. Beveridge, “Improving Productivity and Environmental Performance of Aquaculture,” Apr. 2014, Accessed: Apr. 28, 2023. [Online]. Available:

I. N. Putriantini, A. Dityanawarman, I. Inaiyah, and H. Rahman, “A Model of Fish Consumption Among Indonesian Youth with the Moderation on Their Perception of Fish Quality Assurance,” J. Perikan. Univ. Gadjah Mada, vol. 24, no. 1, Art. no. 1, Jun. 2022, doi: 10.22146/jfs.68366.

A. Suherman, “KKP | Kementerian Kelautan dan Perikanan,” 2020. (accessed Apr. 28, 2023).

FAO, The State of World Fisheries and Aquaculture 2020: Sustainability in action. in The State of World Fisheries and Aquaculture (SOFIA), no. 2020-SOFIA 2020. Rome, Italy: FAO, 2020. doi: 10.4060/ca9229en.

A. K. Jacinda, “Resirculating Aquaculture System (RAS) Technology Applications in Indonesia : A Review,” J. Perikan. Dan Kelaut., vol. 11, no. 1, Art. no. 1, Jun. 2021, doi: 10.33512/jpk.v11i1.11221.

M. Badiola, D. Mendiola, and J. Bostock, “Recirculating Aquaculture Systems (RAS) analysis: Main issues on management and future challenges,” Aquac. Eng., vol. 51, pp. 26–35, Nov. 2012, doi: 10.1016/j.aquaeng.2012.07.004.

H. Yavuzcan Yildiz, L. Robaina, J. Pirhonen, E. Mente, D. Domínguez, and G. Parisi, “Fish Welfare in Aquaponic Systems: Its Relation to Water Quality with an Emphasis on Feed and Faeces—A Review,” Water, vol. 9, no. 1, Art. no. 1, Jan. 2017, doi: 10.3390/w9010013.

H.-F. Liu, X. Ren, B. Xue, C.-W. Bi, Y.-P. Zhao, and Y. Liu, “Systematic optimization of the square arc angle aquaculture tank combining CFD methodology and multi-objective genetic algorithm,” Aquac. Eng., vol. 101, p. 102326, May 2023, doi: 10.1016/j.aquaeng.2023.102326.

C.-H. An, U.-S. Kim, K.-H. Kim, R.-G. Jon, and M.-G. Sin, “Self-cleaning performance of three bottom drain modes in circular culture tank: Experimental and numerical study,” Aquac. Eng., vol. 101, p. 102329, May 2023, doi: 10.1016/j.aquaeng.2023.102329.

ANSYS, “ANSYS Fluent Theory Guide.” 2015.

C.-H. An, M.-G. Sin, M.-J. Kim, I.-B. Jong, G.-J. Song, and C. Choe, “Effect of bottom drain positions on circular tank hydraulics: CFD simulations,” Aquac. Eng., vol. 83, pp. 138–150, Nov. 2018, doi: 10.1016/j.aquaeng.2018.10.005.

M.-G. Sin, C.-H. An, S.-J. Cha, M.-J. Kim, and H.-N. Kim, “A method for minimizing the zone of low water flow velocity in a bottom center drain circular aquaculture tank,” J. World Aquac. Soc., vol. 52, no. 6, pp. 1221–1233, 2021, doi: 10.1111/jwas.12792.

Y. Zhang et al., “Effect of inlet pipe design on self-cleaning ability of a circular tank in RAS,” Front. Mar. Sci., vol. 10, 2023, Accessed: Apr. 28, 2023. [Online]. Available:

S. T. Summerfelt, F. Mathisen, A. B. Holan, and B. F. Terjesen, “Survey of large circular and octagonal tanks operated at Norwegian commercial smolt and post-smolt sites,” Aquac. Eng., vol. 74, pp. 105–110, Sep. 2016, doi: 10.1016/j.aquaeng.2016.07.004.

How to Cite
Ahmad Wali El-Haq and Ryan Anugrah Putra, “Transient Numerical Study to Determine the Effect of Inlet Angle Variation on Flow Conditions inside a Circular Aquaculture Tank”, JI, vol. 8, no. 1, pp. 180-186, May 2023.