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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 | ||
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