Three-dimensional analysis of local scouring induced by a rotating ship propeller

Penna, Nadia; D’Alessandro, Felice; Gaudio, Roberto; Tomasicchio, Giuseppe Roberto

doi:10.1016/j.oceaneng.2019.106294

Cited by 28 publications

(9 citation statements)

References 28 publications

(52 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This would promote eutrophication, worsening the water quality even more. Studies from other countries (Penna et al, 2019;Hong et al, 2015) also point out the problem of the sediment eddying in connection with shipping.…”

Section: Interval Of Yearsmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of the Vranov Reservoir Functions

Oppeltová

Priehoda

2022

Ekológia (Bratislava)

View full text Add to dashboard Cite

Study area – Vranov reservoir on the river Dyje lies in the South Moravian region in the Czech Republic. A multipurpose reservoir, Vranov, is a significant hydraulic structure whose primary purpose is water retention, including managing flood conditions. The reservoir itself and its surroundings are intensively used for recreation, and a hydroelectric power station has also been built there. In 1982, the reservoir began to be used as a source of drinking water. The objective of this study is to elaborate hydrological data – daily total precipitation and daily surface runoff – from 1981 to 2019, evaluate the influence of the Vranov water work, focusing on the hydrological extremes, and evaluate individual functions of this reservoir. The results showed an increase in the number of days of hydrological drought. The influence of the dam as a flood protection element is significant – in summer 2006, a peak of flow rate value of 551 m3 s−1 was transformed to 234 m3 s−1. The reservoir itself and its catchment area have multipurpose usage. Problems may arise in connection with extreme hydrological events when the reservoir cannot perform all its functions at the same time as it does at normal water levels and runoffs. Whether in times of flood or drought, it is necessary to resort to emergency manipulation of the reservoir and choose which of the purposes of the reservoir will be primary at that time.

show abstract

Section: Interval Of Yearsmentioning

confidence: 99%

“…The conflict caused by shipping is amplified in cases of low water levels. Leakages of harmful substances would then be much more concentrated, but increased sediment eddying would also occur (Penna et al, 2019).…”

Section: Interval Of Yearsmentioning

confidence: 99%

Evaluation of the Vranov Reservoir Functions

Oppeltová

Priehoda

2022

Ekológia (Bratislava)

View full text Add to dashboard Cite

show abstract

“…Photogrammetry is used in different fields such as topographic mapping, architecture, engineering, cultural heritage and geology e.g., [37][38][39]. Following the procedure described in Penna et al [40], a Nikon D5200 camera was used, equipped with a Nikkor 18-55 mm f/3.5-5.6 G VR lens. The resulting 3D point cloud was at first transformed into an unstructured triangular mesh by using the software PhotoScan (Agisoft, St. Petersburg, Russia).…”

Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

Turbulent Flow Field around Horizontal Cylinders with Scour Hole

Penna

Coscarella

Gaudio

2020

Water

Self Cite

View full text Add to dashboard Cite

This study presents the results of an experimental investigation on the flow-structure interactions at scoured horizontal cylinders, varying the gap between the cylinder and the bed surface. A 2D Particle Image Velocimetry (PIV) system was used to measure the flow field in a vertical plane at the end of the scouring process. Instantaneous and ensemble-averaged velocity and vorticity fields, viscous and Reynolds stresses, and ensemble-averaged turbulence indicators were calculated. Longitudinal bed profiles were measured at the equilibrium. The results revealed that suspended and laid on cylinders behave differently from half-buried cylinders if subjected to the same hydraulic conditions. In the latter case, vortex shedding downstream of the cylinder is suppressed by the presence of the bed surface that causes an asymmetry in the development of the vortices. This implies that strong turbulent mixing processes occur downstream of the uncovered cylinders, whereas in the case of half-buried cylinders they are confined within the scour hole.

show abstract

“…ρ adalah densitas, p adalah tekanan , gaya benda sehingga terjadinya tegangan viskositas. Kemudian jika menggunakan persamaan RANS model [5], dapat ditulis ulang sesuai dengan Pers. (2).…”

unclassified

“…Pada saat ini studi, formula standar ITTC (International Towing Tank Conference) [6], ditentukan dengan menggunakan pendekatan Pers. (3)(4)(5)(6).…”

unclassified

Analisa Teknis dan Ekonomis Perbaikan Controllable Pitch Propeller (CPP) Kapal KM. Dharma Kencana 3611 GRT

Suharto

Sulaiman

2021

j.rekayasa.mesin.

View full text Add to dashboard Cite

Baling-baling adalah bagian penting dari kapal. Stabilitas, usia pemakaian dan biaya pemakaian memiliki peran penting dalam pemilihan propeller. Pengaruh modifikasi juga ditinjau dari pengaruh penambahan ketebalan material propeller , pada sistem propulsi kapal yang berpengaruh terhadap performa propeller kapal serta hubunganya terhadap biaya reparasi perbaikan dari propeller. Tujuan penelitian ini, menganalisis desain propeller untuk direparasi dan biaya pereparasian propeller untuk mendapatkan performa terbaik dari mesin penggerak propeller sehingga merepresentasikan perbandingan kinerja dari propeller sebelum dan sesudah redesain. Simulasi perhitungan dengan metode finite elemen berbasis persamaan matematik yang menggambarkan karakteritik hidostatik propeller. Perencanaan dan pengunaan material sangat menentukan kekuatan dari proses perbaikan propeller memerlukan perencanaan yang tepat dari segi desain dan material yang akan digunakan. Metode perhitungan dengan numerik ini membantu dalam merekonstruksi desain awal propeller yang telah mengalami kerusakan. Saat putaran propeller pada rpm mesin yang optimum tegangan terjadi pada daun propeller. Hasil analisa menunjukan desain baru dapat memberikan nilai tambah rata-rata 0,24 % untuk nilai L/DT dan terhadap nilai nilai Da / Df memiliki nilai tambah rata-rata 0,46 % . Sementara biaya proses manufaktur dapat berkurang sebesar 38 % karena waktu produksi dan penyesuaian yang tidak terulang ulang kembali.

show abstract

Three-dimensional analysis of local scouring induced by a rotating ship propeller

Cited by 28 publications

References 28 publications

Evaluation of the Vranov Reservoir Functions

Evaluation of the Vranov Reservoir Functions

Turbulent Flow Field around Horizontal Cylinders with Scour Hole

Analisa Teknis dan Ekonomis Perbaikan Controllable Pitch Propeller (CPP) Kapal KM. Dharma Kencana 3611 GRT

Contact Info

Product

Resources

About