| تعداد نشریات | 285 |
| تعداد نشریات سازمان | 83 |
| تعداد شمارهها | 3,110 |
| تعداد مقالات | 34,666 |
| تعداد مشاهده مقاله | 49,821,987 |
| تعداد دریافت فایل اصل مقاله | 80,169,092 |
بررسی پایداری انرژی ویژه در سرریزهای جانبی همگرا در حضور سازههای هدایت کننده | ||
| تحقیقات مهندسی سازه های آبیاری و زهکشی | ||
| دوره 26، بهار - شماره پیاپی 98، اردیبهشت 1404، صفحه 18-1 اصل مقاله (1.21 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/idser.2025.368890.1610 | ||
| نویسندگان | ||
| امیررضا شهریاری1؛ مهدی دریائی* 2؛ سید محمود کاشفی پور3؛ محمدرضا زایری4 | ||
| 1گروه سازههای آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران. | ||
| 2دانشیار،گروه سازه های آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران. | ||
| 3استاد،گروه سازههای آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران. | ||
| 4استادیار،گروه سازههای آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران. | ||
| چکیده | ||
| این پژوهش به بررسی تغییرات انرژی ویژه در سرریزهای جانبی واقع در کانالهای همگرا در حضور سازههای هدایتکننده پرداخته است. با استفاده از نرمافزار FLOW-3D، جریان در سرریز جانبی همگرا شبیهسازی شد. سازههای هدایتکننده در سه موقعیت مختلف طولی و با زاویههای 60، 90 و 120 درجه نسبت به افق روی تاج سرریز قرار گرفتند. صحتسنجی مدل عددی با دادههای آزمایشگاهی نشان داد که خطای شبیهسازیها کمتر از 4 درصد است. نتایج بهدست آمده نشان داد موقعیت میانی سرریز با کمترین تغییرات انرژی ویژه (0/8 درصد)، بهترین محل برای نصب سازههای هدایتکننده است. تأثیر زاویۀ نصب بر تغییرات انرژی ویژه ناچیز بود و میانگین تغییرات برای زاویه های مختلف بین 1/03 تا 1/22 درصد متغیر بود. بررسی تأثیر عدد فرود جریان ورودی نشان داد که در محدوده اعداد فرود کمتر از 0/3، تغییرات انرژی ویژه کمتر از 0/5 درصد است. با افزایش عدد فرود تا 0/45، این تغییرات به 1/6 درصد میرسد که همچنان در محدوده قابلقبول است. نتایج این تحقیق نشان داد که فرض کلاسیک جریانهای متغیر مکانی با خروجی جانبی مبنی بر ثابت بودن انرژی ویژه در طول سرریز، حتی در شرایط همگرایی کانال و حضور سازههای هدایتکننده، همچنان معتبر است. | ||
| کلیدواژهها | ||
| جریان متغیرمکانی؛ دیمارچی؛ دینامیک سیالات محاسباتی؛ سازههای آبی | ||
| عنوان مقاله [English] | ||
| Investigation of Specific Energy Stability in Converging Side Weirs with Guiding Structures | ||
| نویسندگان [English] | ||
| Amirreza Shahriari1؛ Mehdi Daryaee2؛ SeyedMahmood Kashefipour3؛ Mohammadreza Zayeri4 | ||
| 1Department of Water Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. | ||
| 2Associate Professor,, Department of hydraulic structures,Faculty of water and environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. | ||
| 3Professor, Department of Water Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. | ||
| 4Assistant Professor, Department of Water Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. | ||
| چکیده [English] | ||
| Introduction Side weirs are widely used hydraulic structures in irrigation, drainage, and flood control systems. These structures allow excess water to be diverted from the main channel, helping to manage flow capacity effectively. In converging channels, the presence of guiding structures, such as flow deflectors, can influence the hydraulic performance of side weirs. Recent studies have highlighted the potential of guiding structures to enhance discharge capacity. However, uncertainties persist regarding the impact of convergence and added structures on specific energy variations in the main channel. The classical assumption of spatially varied flow with lateral outflow suggests that specific energy remains constant along the weir. This study aims to evaluate the validity of this assumption in converging channels with guiding structures by investigating specific energy variations using numerical simulations. Methodology A three-dimensional numerical model was developed using FLOW-3D to simulate flow over a converging side weir. The experimental setup by Maranzoni et al., (2017) was used as a reference for model validation. The numerical domain consisted of a converging channel with a side weir, and guiding structures were placed on the weir crest at three different longitudinal positions (upstream, middle, and downstream) with installation angles of 60°, 90°, and 120° relative to the horizontal. The Reynolds-averaged Navier-Stokes (RANS) equations were solved using the RNG k-ε turbulence model. Boundary conditions included a specified flow rate at the inlet, a pressure outlet at the downstream boundary, and wall conditions for the channel boundaries. Grid independence was ensured by testing different mesh resolutions, with the final model consisting of approximately 1.5 million cells. The numerical model was validated against experimental data, with a maximum simulation error of less than 4%. Results and Discussion The numerical results showed that guiding structures influenced specific energy variations along the weir. The middle position of the weir exhibited the least change in specific energy (0.8%) , making it the optimal location for installing guiding structures. In contrast, upstream and downstream placements resulted in greater energy variations, with mean differences of 1.17% and 1.37%, respectively. The effect of installation angle on specific energy variations was negligible. Across different angles, the mean variation ranged from 1.03% to 1.22%, indicating that the angle of installation had little impact on energy conservation. The influence of the inflow Froude number was also examined. For Froude numbers below 0.3, specific energy variations remained under 0.5%. As the Froude number increased to 0.45, energy variations reached 1.6%, which is still within an acceptable range. These findings suggest that specific energy variations are more sensitive to the location of guiding structures than their installation angle. The results confirm that the classical assumption of constant specific energy in spatially varied flow with lateral outflow holds even in converging channels with guiding structures. Although minor deviations were observed, they were within acceptable limits for practical applications. Conclusions In this study, by comparing the simulation results with experimental data, it was found that the model used for simulating flow over side weirs possesses high accuracy and reliably predicts the actual performance of these structures. One of the key aspects of this research is the accurate simulation of side weirs in converging channels. Despite numerous studies in this area, especially in recent years, certain aspects of the design and hydraulic behavior of these types of weirs still require more detailed investigation and numerical modeling. The findings of this study demonstrated that the classical concept of specific energy stability in gradually varied flow with decreasing discharge remains valid even under converging conditions and in the presence of guiding structures. The average difference in specific energy between the upstream and downstream of the weir in all simulations was 1.24%. Additionally, the influence of the Froude number on the increase in specific energy variations was clearly observed. However, within the range of Froude numbers less than 0.5, which is typically dominant in irrigation and drainage channels, specific energy variations did not exceed 3%. Finally, for future research, it is recommended to investigate the effects of factors such as the crest height of the side weir, the presence of orifices within the weir structure, and the influence of supercritical flow regimes on specific energy variations along side weirs, in order to develop a more comprehensive understanding of their hydraulic behavior. Acknowledgement We are grateful to the Research Council of Shahid Chamran University of Ahvaz for financial support (GN: SCU.WH1402.31370). | ||
| کلیدواژهها [English] | ||
| CFD, De Marchi, Spatially varied flow, Water structures | ||
| مراجع | ||
|
Abbasi, S., Fatemi, S., Ghaderi, A., & Di Francesco, S. (2020). The effect of geometric parameters of the antivortex on a triangular labyrinth side weir. Water, 13(1), 14. Abdollahi, A., Kabiri-Samani, A., Asghari, K., Atoof, H., & Bagheri, S. (2017). Numerical modeling of flow field around the labyrinth side-weirs in the presence of guide vanes. ISH Journal of Hydraulic Engineering, 23(1), pp.71-79 Ahadiyan, J., Pipelzadeh, S., & Omidvarinia, M. (2016). Hydraulic Simulation of Sewage Discharge in an Irrigation and Drainage System by Changing the Vertical Angle of the Bottom Circular Buoyant Jet. Irrigation and Drainage Structures Engineering Research, 16(65), pp.1-18 (In Persian) Alahdadi, K., & Shafai-Bajestan, M. (2020). The flow discharge over side weirs in rectangular channels with a decreasing width downstream of the weir. 18th Iranian Hydraulics Conference, University of Tehran. Iran. (In Persian) Azimi, H., Shabanlou, S., & Kardar, S. (2018). Turbulent Flow in the Vicinity of Side Weirs in Subcritical Conditions. Mathematical Models and Computer Simulations, 10(6), pp.784-797 Bacco, M. D., & Scorzini, A. R. (2020). Experimental analysis on sediment transport phenomena in channels equipped with inclined side weirs. 8th IAHR International Symposium on Hydraulic Structures ISHS2020, Santiago, Chile. Bagheri Seyyed Shekari, N., Eghbalzadeh, A., Javan, M. (2018). 'The Effect of Downstream Water Depth on Hydraulic Jump Characteristics Along Side Weir', Water and Soil Science, 28(3), pp. 195-208 (In Persian) Bagherifar, M., Emdadi, A., Azimi, H., Sanahmadi, B., & Shabanlou, S. (2019). Numerical evaluation of turbulent flow in a circular conduit along a side weir. Applied Water Science, 10(1). Balmforth, D. J., & Sarginson, E. J. (1983). The effects of curvature in supercritical side weir flow. Journal of Hydraulic Research, 21(5), pp.333-343 Bernoulli, D. (1738). Hydrodynamica, sive, De viribus et motibus fluidorum commentarii. Sumptibus Johannis Reinholdi Dulseckeri, typis Joh. Henr. Deckeri, Typographi Basiliensis. Borghei, S. M., & Parvaneh, A. (2011). Discharge characteristics of a modified oblique side weir in subcritical flow. Flow Measurement and Instrumentation, 22(5), pp.370-376 Citrini, D. (1942). Canali rettangolari con portata e larghezza gradualmente variabili. Società Editrice Riviste Industrie Eletriche. Daryaee, M., Sharifi, S. M., Shahriari, A., Kashefipour, S., & Zayeri, M. (2025). Numerical Modeling of the Effect of Orifices in Stepped Spillways on Flow Energy Dissipation Using the FLOW-3D Model. Iranian Journal of Soil and Water Research. (In Persian) De Marchi, G. (1934). Saggio di teoria del funzionamento degli stramazzi laterali (Theoretical knowledge on the functioning of sideweirs). L'Energia Elettria, 11(11), pp.849-860 El-Khashab, A., & Smith, K. V. H. (1976). Experimental Investigation of Flow Over Side Weirs. Journal of the Hydraulics Division, 102(9), pp.1255-1268 Ghaderi, A., Dasineh, M., Abbasi, S., & Abraham, J. (2019). Investigation of trapezoidal sharp-crested side weir discharge coefficients under subcritical flow regimes using CFD. Applied Water Science, 10(1). Ghodsian, M. (2004). Flow over Triangular Side Weir. Scientia Iranica, 11(1). Ghorbannia, D., & Eghbalzadeh, A. (2018). Numerical study of the effect of length change on the flow pattern around a side weir in a converging channel. Acta Mechanica, 229(10), pp.4101-4111 Hager, W. H. (1987). Lateral outflow over side weirs. Journal of Hydraulic Engineering, 113(4), pp.491-504 Hirt, C. W., & Nichols, B. D. (1981). Volume of fluid (VOF) method for the dynamics of free boundaries. Journal of Computational Physics, 39(1), pp.201-225 Hussein, B. S., & Jalil, S. A. (2024). Hydrodynamic Behavior Simulation of Flow Performance over Labyrinth Side Weir. Polish Journal of Environmental Studies, 33(2), pp.1159-1171 Idrees, A. K., & Al-Ameri, R. (2023). Investigating a new approach to enhance the discharge capacity of labyrinth weirs. Journal of Hydroinformatics, 25(2), pp.300-317 Kalateh, F., Aminvash, E. (2023). Numerical Simulation of the Effect of Channel bed Slope on the Hydraulic Performance of Sharp-Crested Rectangular Side Weir with Subcritical and Supercritical Regimes, Iranian Journal of Soil and Water Research, 54(1), pp. 67-84 (In Persian) Maranzoni, A., & Tomirotti, M. (2021). 3D CFD analysis of the performance of oblique and composite side weirs in converging channels. Journal of Hydraulic Research, 59(4), pp.586-604 Maranzoni, A., Pilotti, M., & Tomirotti, M. (2017). Experimental and Numerical Analysis of Side Weir Flows in a Converging Channel. Journal of Hydraulic Engineering, 143(7). Neysi, K., Daryaee, M., Kashefipour, S. M., Shahriari, A., & Zayeri, M. (2025). Improving Water Diversion Efficiency in Converging Side Weirs through Side Vane Installation: a numerical simulation. Journal of Irrigation Sciences and Engineering, 47(4), pp.93-104 Novak, P., Guinot, V., Jeffrey, A., & Reeve, D. E. (2018). Hydraulic modelling: An introduction: Principles, methods and applications. CRC Press. Paris, E., Solari, L., & Bechi, G. (2012). Applicability of the De Marchi Hypothesis for Side Weir Flow in the Case of Movable Beds. Journal of Hydraulic Engineering, 138(7), pp.653-656 Parsi, E., Allahdadi, K., Bahrebar, A. and Farhadi, R. 2021. Effect of downstream contraction on side weirs discharge. Iranian Journal of Irrigation & Drainage, 15, pp.455-466 (In Persian) Robinson, D. I., & McGhee, T. J. (1993). Computer Modeling of Side‐Flow Weirs. Journal of Irrigation and Drainage Engineering, 119(6), pp.989-1005 Saffar, S. , Solimani Babarsad, M. , Mahmoodian Shooshtari, M. , Poormohammadi, M. H. and Riazi, R. (2022). Experimental study of flow converging section side weir hydraulics. Journal of Marine Science and Technology, 21(3), pp.23-32 (In Persian) Saffar, S., Safaei, A., Aghaee Daneshvar, F., & Solimani Babarsad, M. (2024). Flow-3D numerical modeling of converged side Weir. Iranian Journal of Science and Technology, Transactions of Civil Engineering, 48(1), pp.431-440 Shahriari, A., Daryaee, M., Kashefipour, S., & Zayeri, M. (2024). Numerical Simulation of the Effect of Single Guide Vane Installation on the Hydraulic Performance of Side Weirs in Converging Channels. Iranian Journal of Science and Technology, Transactions of Civil Engineering, pp.1-11 Spurk, J. H., & Aksel, N. (2019). Fluid Mechanics. Springer International Publishing. Subramanya, K., & Awasthy, S. C. (1972). Spatially Varied Flow over Side-Weirs. Journal of the Hydraulics Division, 98(1), pp.1-10 Vatankhah, A. R. (2012a). Analytical solution for water surface profile along a side weir in a triangular channel. Flow Measurement and Instrumentation, 23(1), pp.76-79 Vatankhah, A. R. (2012b). Briefing: Water surface profile over side weir in a trapezoidal channel. Proceedings of the Institution of Civil Engineers - Water Management, 165(5), pp.247-252 Vatankhah, A. R. (2013). Water surface profile along a side weir in a parabolic channel. Flow Measurement and Instrumentation, 32, pp.90-95 Venutelli, M. (2008). Method of solution of nonuniform flow with the presence of rectangular side weir. Journal of irrigation and drainage engineering, 134(6), pp.840-846 Yakhot, V., Orszag, S. A., Thangam, S., Gatski, T., & Speziale, C. (1992). Development of turbulence models for shear flows by a double expansion technique. Physics of Fluids A: Fluid Dynamics, 4(7), pp.1510-1520 | ||
|
آمار تعداد مشاهده مقاله: 626 تعداد دریافت فایل اصل مقاله: 372 |
||