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... conditions have an important role in the flow simulation; accurate result can be obtained by specifying an appropriate initial and boundary conditions. ANSYS-CFX code contains several boundary conditions such as inlet, outlet, opening, wall and symmetry (Figure 2). Inlet boundary condition specified at inlet section with the average velocity, water and air volume fraction. ...
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... Pelimpah direncanakan mempunyai desain yang fungsional dan ekonomis, sehingga parameter hidrolik seperti kecepatan liran, ketinggian muka air dan debit dapat diketahui dengan tepat [1]. Bagian dari bangunan pelimpah antara lain saluran pengarah, saluran pengatur, saluran peluncur dan kolam olak. ...
Pada pemodelan numerik, terdapat aspek pendukung yaitu data teknis bangunan dan debit banjir rancangan Q100th, Q1000th, dan QPMF. Hasil dari pemodelan numerik dilakukan perbandingan dengan perhitungan teoritis berupa nilai tinggi muka air dan kecepatan. Verifikasi menggunaan metode Brier-Skill Score (BSS). Hasil perhitungan teoritis menunjukkan kondisi aliran memenuhi kriteria hidrolika, tidak terjadi aliran getar dan kavitasi. Pada pemodelan numerik menggunakan Autodesk CFD terdapat ketinggian muka air yang melebihi tinggi jagaan pada QPMF. Hasil verifikasi menjukkan bahwa tinggi muka air pada Q100th dan Q1000th menghasilkan klasifikasi Bries-skill Score kategori excellent, sementara itu pada QPMF didapatkan klasifikasi good. Pada kecepatan aliran menghasilkan klasifikasi Bries-skill Score yaitu excellent. Berdasarkan klasifikasi, maka model numerik cukup mampu untuk merepresentasikan perhitungan teoritis
... Pelimpah tipe lain yang juga biasanya ditemui adalah pelimpah ogee yang kontrolnya diatur melalui pintu. Pelimpah tipe ini biasanya dibangun pada bendungan urugan untuk mengalirkan debit banjir dari waduk untuk mencegah terjadinya overtopping pada tubuh bendungan (Ahmed & Aziz, 2018). Pelimpah harus memiliki desain yang ekonomis dan fungsional, oleh karena itu, parameter hidrolik seperti debit, kedalaman aliran dan kecepatan harus diketahui secara akurat. ...
Jumlah variabel yang diperlukan dalam proses perancangan struktur hidrolik sangat menyulitkan jika semua parameter didefinisikan secara matematis. Model numerik adalah salah satu alternatif yang sudah banyak digunakan oleh para ahli dalam menyelesaikan kesulitan tersebut. Studi ini dilakukan untuk mengkaji model tiga dimensi (3D) yang direpresentasikan dengan Digital Terrain Model (DTM) dari data pengukuran lapangan untuk mengetahui kemampuan model numerik yang diimplementasikan pada struktur pelimpah Bendungan Leuwikeris dapat mendekati model fisik yang sebelumnya sudah pernah dilakukan. Simulasi numerik dilakukan dengan menggunakan Open Foam software sebagai alat komputasi fluida dinamis (CFD). Simulasi dilakukan dalam tiga skenario yaitu pada aliran debit QPMF, Q1000, dan Q100. Masing – masing skenario akan meninjau gaya tekanan air yang bekerja pada dinding saluran peluncur dan performa redaman energi kolam olak. Hasil studi menunjukkan elevasi air di hulu pelimpah pada aliran debit QPMF, Q1000, dan Q100 telah sesuai dengan hasil pemodelan fisik yang telah dilakukan. Elevasi muka air pada tembok yang berhadapan dengan pelimpah dan pintu air perlu melebihi elevasi tembok desain yang ada untuk QPMF. Apabila limpasan saat QPMF tidak diijinkan, maka elevasi puncak tembok perlu ditambah sampai pada elevasi +155,00 m. Kolam olak belum mampu meredam aliran pada debit rencana Q100 tahun sehingga perlu dilakukan modifikasi desain yang ada.
The purpose of this research is to examine the performance of rectangular broad and sharp-crested
weirs in terms of cavity index and discharge coefficient. For this purpose, a computational fluid
dynamics CFD code FLUENT is applied. Firstly, the code verified applies to the experiments work of
Hager et al 1994 the results show excellent agreements between CFD and Hager et al 1994. Secondly,
the code is applied on both broad and sharp-crested weirs. The results demonstrate that broad-crested
weirs have a lower discharge coefficient than sharp-crested weirs, implying that broad-crested weirs
have a lower ability to discharge flow than sharp-crested weirs. While the cavity index of a broad
crested weir is lower than that of a sharp-crested weir, the risk of cavitation is lower for a broad
crested weir. Finally, designers should use caution when deciding which type of crest to use in their
designs.
The purpose of this research is examining the performance of rectangular broad and sharp crested weirs in terms of cavity index and discharge coefficient. For this purpose, a computational fluid dynamics CFD code FLUENT is applied. Firstly, the code verified by applies on the experiments work of Hagre et al 1994 the results show excellent agreements between CFD and Hager et al 1994. Secondly the code applied on both broad and sharp crested weirs. The results demonstrate that broad crested weirs have a lower discharge coefficient than sharp crested weirs, implying that broad crested weirs have a lower ability to discharge flow than sharp crested weirs. While the cavity index of a broad crested weir is lower than that of a sharp crested weir, the risk of cavitation is lower for a broad crested weir. Finally, designers should use caution when deciding which type of crest to use in their designs.
Introduction. The authors present one of methods for measuring water flows through the intake of a hydroelectric power plant. The new structure has a metal frame and a folding rotary row. The authors analyzed the advantages of the proposed, and mase strength and hydraulic analyses. Computational studies of the stress-strain state, made with account taken of the actual hydrodynamic pressure, allow choosing the optimal position of measurement points, designing a frame structure, and making highly accurate measurements of energy characteristics.
Materials and methods. Top international publications, as well as archived materials, were analyzed to select the universal frame structure. The most promising directions were identified; the advantages and disadvantages of the proposed solutions were taken into account. Complex computational studies were performed using ANSYS Mechanical, a universal industrial software package, and ANSYS CFX, a specialized module for modeling flows of liquids and gases with account taken of turbulence.
Results. The position of measurement points that ensure the least distortion of the flow and tilt angles of hydraulic turntables were determined during the hydraulic simulation. The flow loads were taken into account when the stress-strain state of the universal frame structure was calculated; optimal design solutions were selected to ensure the strength and reliability of metal elements. Stress concentration zones were identified for monitoring purposes during installation.
Conclusions. Given the mathematical modeling data and experimental field studies, a universal frame structure for energy tests was substantiated. The new design ensures a measurement error of ±0.67 %, which corresponds to the leading world standards.
