تحلیل جریان با عمق محدود حول هیدروفویل‌های دوبعدی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مکانیک دانشگاه فردوسی مشهد

2 دانشجوی گروه مکانیک دانشگاه فردوسی مشهد

3 Mashhad, p.o. box 91775-1111, Iran

چکیده

بررسی پارامترهای هیدرودینامیکی اجسام در حال حرکت و کاملاً غوطه‌ور در سیال به‌منظور شناخت اثرات سرعت، انحنا، ضخامت و زاویه حمله هیدروفویل از سال‌ها پیش و با روش‌های مختلف انجام می‌گیرد. نرم‌افزار محاسباتی فلوئنت امکان حل معادلات حاکم با استفاده از روش VOF برای شبیه‌سازی جریان دوفازی آب و هوا را به‌خوبی فراهم کرده است. مدل آشفتگی استفاده‌شده در این تحقیق نیز، مدل آشفتگی رینولدز RSM است که عموماً مدلی دقیق‌تر می‌باشد. در مطالعه‌ حاضر، اثرات سطح آزاد و کف محدود بر روی هیدروفویل‌های غوطه‌ور به‌طور هم‌زمان بررسی شده و نتایج حاصل با نتایج به‌دست‌آمده از روش المان مرزی، مقایسه شده است. نتایج نشان می‌دهد هیدروفویلی که در عمق بیشتری قرار گرفته، دارای ضرایب برآ و پسای بالاتر و نسبت برآ به پسای بیشتری است. هم‌چنین در آب‌های کم‌عمق هیدروفویل‌های با انحنای بیشتر و زاویه‌ حمله‌ کمتر از عملکرد بهتری برخوردارند و امواج پایین‌دست جریان زودتر میرا می‌شوند.

کلیدواژه‌ها

عنوان مقاله [English]

Analysis of Submerged 2D Hydrofoils with Finite Depth

نویسندگان [English]

  • Mahmoud - Pasandidehfard 1
  • Maryam Saberinia 2
  • Majid Izadfar 3
1 Mechanical engineering, Ferdowsi university of Mashhad
2 Msc. student of Mechanical engineering Ferdowsi university of Mashhad, Iran
3 Mechanical engineering, Ferdowsi university of Mashhad
چکیده [English]

Investigation of the hydrodynamic parameters of the moving objects under the free surface in order to study the effects of velocity, curvature, thickness and angle of attack of hydrofoils has been initiated since many years. The computational fluid dynamics software, FLUENT, provides the solution of the governing equations with VOF method for two phases flows. The RSM turbulence model is used in this article which is more accurate generally. In the present study, the effects of free surface and finite depth on the hydrofoils characteristics are investigated simultaneously and compared with those derived from the BEM method and validated with the existing and experimental values. The results show that for the hydrofoils in the more depth, the lift and drag coefficients and lift to drag fraction increases. Furthermore, in shallow water flows, the hydrofoils with higher camber and lower angle of attack have better performance and the downstream waves damp earlier.

کلیدواژه‌ها [English]

  • Free Surface
  • Hydrofoil
  • Finite Depth
  • Hydrodynamics Coefficients

مراجع

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فایل ها

سابقه مقاله

  • تاریخ دریافت: 16 فروردین 1398
  • تاریخ بازنگری: 11 اسفند 1398
  • تاریخ پذیرش: 03 تیر 1399
  • تاریخ انتشار: 01 اسفند 1398

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