بررسی ضریب دبی سرریزهای کنگره‌ای منقاری مثلثی با استفاده از نرم‌افزار FLUENT و الگوریتم‌های گرگ خاکستری و انتخابات

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب دانشگاه تبریز

2 گروه مهندسی کامپیوتر، دانشکده فنی و مهندسی، دانشگاه بناب

3 گروه علوم و مهندسی آب، دانشگاه تبریز

10.22091/cer.2021.6942.1250

چکیده

سرریز‌های کنگره‌ای از جمله سازه‌های هیدرولیکی مهم جهت تنظیم سطح آب و کنترل جریان در کانال‌ها، رودخانه‌ها و مخازن سد‌ها محسوب می‌شوند. جهت استفاده بهینه از این نوع سرریزها، برآورد مقدار ضریب دبی ضروری است. در همین راستا، در این پژوهش با استفاده از مجموعه داده‌ای شامل 120 داده آزمایشگاهی جمع‌آوری شده توسط کومار و همکاران (2011) و عددی شبیه‌سازی شده توسط نرم‌افزار FLUENT با استفاده از مدل آشفتگی (k-ε RNG) به برآورد بهینه ضریب دبی سرریزهای کنگره‌ای منقاری مثلثی که در یک کانال مستطیلی به عرض 0.28 متر، طول 12 متر و ارتفاع 0.41 متر تعبیه شده، با استفاده از الگوریتم‌های فراابتکاری نوین گرگ خاکستری (GWO) و انتخابات (EA)، پرداخته شد. برای بررسی اثر ضریب دبی، زوایای 30، 60، 90، 120، 150 و 180 درجه با ارتفاع سرریز، 10 سانتی‌متر انتخاب و شرایط جریان در تمامی حالات به‌صورت زیربحرانی، آشفته و جریان ریزشی در نظر گرفته شد. تابع هدف مجموع مربعات اختلاف بین دبی محاسباتی و مشاهداتی است که به‌صورت کمینه تعریف شد. مقایسه نتایج الگوریتم‌های GWO و EA و نرم‌افزار FLUENT با کسب مقادیر R2=0.96 و NRMSE=0.052 در مقایسه با مقادیر مشاهداتی، نشان‌دهنده تطابق مناسب بین مقادیر مشاهداتی و محاسباتی می‌باشد. با توجه به نتایج حاصل از اجرای الگوریتمهای GWO و EA مقدار ضریب دبی جریان بهینه در بین سرریزهای کنگرهای منقاری مثلثی مورد بررسی در سرریز با زاویه رأس 60 درجه و به‌ترتیب برابر با مقادیر 0.44 و 0.5 به‌دست آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Discharge Coefficient of Triangular Duckbill Labyrinth Weirs Using Fluent Software and Gray Wolf and Elections Algorithms

نویسندگان [English]

  • Somayeh Emami 1
  • Javad Parsa 1
  • Hojjat Emami 2
  • Akram Abbaspour 3
1 Water Engineering Department of Tabriz
2 Assistant Professor of Computer Engineering, Faculty of Engineering, University of Bonab
3 Associate Professor, Department of Water Engineering, University of Tabriz
چکیده [English]

Labyrinth weirs are important hydraulic structures for water level regulation and flow control in canals, rivers, and reservoirs. Due to the uneven distribution of hydraulic head on the weir crest, the discharge coefficient changes along the labyrinth weirs are noticeable. For optimal use of this type of weir, it is necessary to estimate the discharge coefficient. In this regard, in this study, using a data set including 120 experimental data collected by Kumar et al. (2011) and numerical (simulated by FLUENT software using k-ε RNG turbulence model) to optimally estimate the discharge coefficient of triangular-duckbill labyrinth weir embedded in a rectangular channel 0.28 m wide, 12 m long and 0.41 m high was addressed using modern gray wolf meta-heuristic (GWO) and election (EA) algorithms. To investigate the effect of discharge coefficient, angles of 30, 60, 90, 120, 150 and 180 degrees with weir height of 10 cm were selected and the flow conditions in all cases were considered as subcritical, turbulent and falling flow. The objective function is the sum of the squares of the difference between the computational flow and the observations defined as the minimum. Comparison of the results of GWO and EA algorithms and FLUENT software with values of R2=0.96 and NRMSE=0.052 in comparison with the observed values, shows a good agreement between the observed and computational values.

کلیدواژه‌ها [English]

  • Flow Control
  • optimization
  • Meta-Heuristic Algorithms
  • Turbulence Model
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