مطالعه مقایسه‌ای جریان آب-هوا در پرش هیدرولیکی به‌کمک نرم‌افزارهای اوپن‌فوم و انسیس فلوئنت

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه، ایران.

10.22059/jwim.2025.388864.1206

چکیده

پرش هیدرولیکی نوعی جریان متغیر سریع بوده که در اثر آن جریان فوق بحرانی در فاصله کوتاهی به جریان زیربحرانی تبدیل می‌شود. این پدیده به‌دلیل کاربردها و مزیت‌های فراوانی که دارد همواره موردتوجه پژوهش‌گران بوده است. در پژوهش حاضر، میدان جریان دوفازی آب- هوا در پرش هیدرولیکی در حالت دوبعدی به‌کمک نرم‌افزارهای متن‌باز اوپن‌فوم و تجاری انسیس فلوئنت شبیه‌سازی شده که پرش هیدرولیکی از نوع کلاسیک برای جریان ورودی با عدد فرود 5/7 و عدد رینولدز 106×4/1 می‌باشد. در شبیه‌سازی عددی فصل مشترک بین دو فاز آب‌وهوا از روش حجم سیال و برای مدل‌کردن آشفتگی از روش RANS استفاده شده نتایج حاصل از مدل‌سازی با استفاده از این دو نرم‌افزار با یکدیگر و نتایج آزمایشگاهی موجود در پیشینه پژوهش مقایسه شده است. نتایج پژوهش که شامل مشخصه‌های هیدرولیکی پرش از قبیل طول غلتک، عمق ثانویه، پروفیل سطح آزاد، حداکثر و حداقل سرعت در مقاطع قائم در طول پرش و غلظت هوای جریان می‌باشد حکایت از تطابق مناسب نتایج عددی و آزمایشگاهی دارد. طول غلتک پرش هیدرولیکی حاصله با استفاده از نرم‌افزارهای اوپن‌فوم و انسیس فلوئنت به‌ترتیب 51/1 و 55/1 متر محاسبه شد که خطا نسبت به مقادیر آزمایشگاهی به‌ترتیب حدود چهار و هفت درصد است. ضریب تعیین پروفیل سطح آزاد در اوپن‌فوم و انسیس فلوئنت به‌ترتیب 99 و 95 درصد بوده و شاخص KGE برای پروفیل سطح آزاد 94/0 و 8/0 است. حداکثر غلظت هوا در ناحیه برشی پرش در عمقی معادل 42/1 برابر عمق اولیه پرش، برابر با 41/0 مشاهده شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A Comparative Study of Air-Water Flow in Hydraulic Jump using OpenFoam and ANSYS Fluent Softwares

نویسندگان [English]

  • Nahid Mirizadeh
  • Mohammad Manafpour
Department of Civil Engineering, Faculty of Engineering, Urmia University, Urmia, Iran.
چکیده [English]

A hydraulic jump is a type of rapidly varied flow that occurs when supercritical flow transitions to subcritical flow over a short distance. This phenomenon has gathered significant attention from researchers due to its numerous advantages. In this study, the air-water two-phase flow field of the hydraulic jump is simulated in two dimensions using two software packages: OpenFoam and ANSYS Fluent. The Froude number for the hydraulic jump is 7.5, and the Reynolds number is 1.4 x 10^6. In order to simulate the flow field, the volume of fluid (VOF) method, along with Reynolds-Averaged Navier-Stokes (RANS) equations, were employed. The results from the two software packages were compared with one another, as well as with existing laboratory results and findings from the literature. The results include various hydraulic characteristics of the jump, such as roller length, secondary conjugate depth, free surface profile, maximum forward and backward velocity along the channel and the air concentration of the flow. These findings indicate an appropriate agreement between numerical simulations and experimental data. The calculated length of the hydraulic jump roller was 1.51 meters using OpenFoam and 1.55 meters using ANSYS Fluent, resulting in errors of approximately four and seven percent, respectively, compared to laboratory values. The coefficient of determination for the free surface profile was 99% for OpenFoam and 95% for ANSYS Fluent, while the Kling-Gupta Efficiency (KGE) index for the free surface profile was 0.94 and 0.8, respectively. The maximum air concentration in the shear region of the roller was observed at a depth of 1.42 times the initial depth of jump, with a concentration value of 0.41.

کلیدواژه‌ها [English]

  • Air-water two-phase flow
  • Computational fluid dynamics
  • Numerical modeling
  • Turbulence
  • Volume of fluid method

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مدیریت آب و آبیاری
دوره 15، شماره 2
شهریور 1404
صفحه 337-354

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