Otterboard hydrodynamic performance testing in flume tank and wind tunnel facilities

Mellibovsky, Fernando; Prat, Josep; Notti, Emilio; Sala, Antonello

doi:10.1016/j.oceaneng.2017.12.034

Cited by 12 publications

(3 citation statements)

References 13 publications

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“…Mesh independent dilakukan untuk menentukan meshing yang tepat dan mendapatkan ukuran dan solusi mesh yang optimal [20]. Dengan melakukan variasi seperti ukuran elements, kualitas mesh dapat dibagi menjadi beberapa sesuai kebutuhan.…”

Section: Materials Dan Metodologiunclassified

Simulasi 3D dan Studi Eksperimental Aliran Udara pada Variasi Geometri Menggunakan Wind Tunnel

Firmansyah,

Wirardi,

Naryanto

et al. 2023

j.rekayasa.mesin.

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Aliran udara laminar memberikan dampak positif bagi benda yang bergerak diudara jika dibandingkan dengan aliran tubulansi. Secara teori, jenis aliran laminar dan turbulansi dapat diketahui dari nilai Reynold number, namun tidak bisa dilihat secara visual tanpa ada alat khusus yang menggunakan asap atau kabut. Wind smoke tunnel merupakan alat yang dapat digunakan untuk mensimulasikan dan memperlihatkan aliran udara serta benda yang bergerak didalam aliran udara. Pentingnya visualisasi aliran udara adalah untuk melihat efek dari berbagai bentuk benda terhadap sifat aerodinamis. Visualisasi aliran udara dapat memberikan gambaran aliran udara yang melewati benda atau obyek tanpa menggunakan perhitungan yang komplek. Benda yang digunakan dapat berupa benda asli atau benda dalam bentuk model yang diatur skala perbandingannya. Wind tunnel dibuat dengan panjang 2 m dengan dimensi seksi uji adalah 50 cm x 30 cm x 20 cmm. Dengan kondisi batas tersebut selanjutnya akan dihitung dimensi untuk construction dan diffuser wind tunnel. Selanjutnya adalah membuat smoke generator yang akan digunakan untuk memperlihatkan aliran udara disekitar benda uji. Smoke generator dibuat dengan mekanisme pembakaran fuel yang kemudian disambungkan pada pipa yang terpasang pada wind tunnel. Benda uji yang telah dibuat kemudian dipasang pada test section kemudian dijalankan fan pada wind tunnel sehingga menghisap udara untuk melewati benda uji dan akan memperlihatkan pola aliran disekitar benda uji.

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Section: Materials Dan Metodologiunclassified

Simulasi 3D dan Studi Eksperimental Aliran Udara pada Variasi Geometri Menggunakan Wind Tunnel

Firmansyah,

Wirardi,

Naryanto

et al. 2023

j.rekayasa.mesin.

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“…Due to factors such as high costs, the time-consuming nature, and uncontrollable testing conditions, offshore measurements are significantly affected. Consequently, model experiments and numerical simulations are widely applied, due to their convenience and controllable testing conditions [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Study on the Hydrodynamic Performance of the Beam Used in the Antarctic Krill Beam Trawl

Li,

Liu,

Wang

et al. 2023

Fishes

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The beam trawl is one of the primary operational trawls for Antarctic krill, and its beam provides horizontal expansion support for the trawl net. The hydrodynamic performance of the beam significantly affects the vertical expansion and sinking performance of the trawl, as well as impacts the energy consumption of the fishing vessel. In this study, the beam of the Antarctic krill trawl used on the “Shen Lan” fishing vessel served as a prototype. Three types of beams, cylindrical, airfoil, and elliptical, were designed. The hydrodynamic performances of beams with different shapes at different angles of attack were studied using numerical simulation, and the accuracy of the numerical simulation was validated through the flume test. The results show that the cylindrical beam has a higher drag coefficient and a lower lift coefficient, compared to the airfoil beam and the elliptical beam. Under different angles of attack, the cylindrical beam’s drag coefficient is, on average, 49.54% higher than that of the airfoil beam and 59.74% higher than that of the elliptical beam. Its lift coefficient is 87.79% lower than that of the airfoil beam and 85.06% lower than that of the elliptical beam, respectively. At different angles of attack, the hydrodynamic coefficients of the airfoil beam and the elliptical beam are similar, and their trends, with respect to the angle of attack, are generally consistent. The drag coefficients increase with an increasing angle of attack, while the lift coefficients show a trend of initially increasing and then decreasing with an increasing angle of attack. The absolute values of the lift coefficients for the airfoil beam and the elliptical beam both reach their maximum values at an angle of attack of 45°, with values of 0.703 and 0.473, respectively. Compared to the cylindrical beam, the hydrodynamic performances of the airfoil beam and elliptical beam are superior.

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“…Wind tunnels have been previously used to successfully describe the hydrodynamics of other towed fishing gears (Reite and Sørensen, 2006;Paschen et al, 2008;Mellibovsky et al, 2015Mellibovsky et al, , 2018. Within a Reynolds number based test regime, it is often advantageous to conduct experiments in a wind tunnel rather than in a flume tank.…”

Section: Introductionmentioning

confidence: 99%

Understanding the hydrodynamics of a size sorting grid in a crustacean fishery

et al. 2020

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Otterboard hydrodynamic performance testing in flume tank and wind tunnel facilities

Cited by 12 publications

References 13 publications

Simulasi 3D dan Studi Eksperimental Aliran Udara pada Variasi Geometri Menggunakan Wind Tunnel

Simulasi 3D dan Studi Eksperimental Aliran Udara pada Variasi Geometri Menggunakan Wind Tunnel

Study on the Hydrodynamic Performance of the Beam Used in the Antarctic Krill Beam Trawl

Understanding the hydrodynamics of a size sorting grid in a crustacean fishery

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