ارزیابی مدل آشفتگی جدید GEKO در جریان همراه با کاویتاسیون بر روی پرتابه‌های استوانه‌ای سرتخت و سر کروی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه فردوسی مشهد

چکیده

تحلیل جریان سیال همراه با کاویتاسیون در کاربردهای هیدرودینامیکی بسیار حائز اهمیت است. در این ارتباط پیش بینی دقیق ابعاد کاویتی و نوزیع فشار و دینامیک جریان اطراف و داخل کاویتی بخصوص در محل بسته شدن کاویتی بسیار مورد توجه بوده است. در این مقاله جریان همراه با کاویتاسیون حول پرتابه­های استوانه­ای با دماغه سر تخت و نیم کروی بصورت عددی بررسی شده است. بدین منظور در مقاله حاضر چهار مدل آشفتگی k-ε-Realizeable، K-ω، k-ω SST و GEKO توسط نرم افزار فلوئنت بررسی شده است.  مدل کاویتاسیون زوارت برای تحلیل جریان استفاده گردیده است. در این پژوهش جریان با دامنه اعداد کاویتاسیون مختلف (8/1 تا 1/0) با نتایج تجربی و عددی دیگران مورد مقایسه قرار گرفته است. نتایج به‌دست آمده نشان می‌دهد مدل آشفتگی اخیر ارائه شده توسط منتر بنام GEnelarilized-KOmega (GEKO) که دو معادله اضافی حل می­کند و جدیدا به نرم افزار فلوئنت افزوده شده است خصوصا برای اعداد کاویتاسیون بزرگتر به همراه مدل کاویتاسیون زوارت جواب به مراتب بهتری ارائه می‌دهد. 

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the New GEKO Turbulence Model For Flows with Cavitation Around Projectiles with Flat and Hemispherical Heads

نویسندگان [English]

  • ramin fadaeiroodi
  • mahmod pasandidehfard
frdwosi uni of mashhhad
چکیده [English]

In hydrodynamic applications, accurately predicting fluid flows with cavitation is very important. In this regard, prediction of the cavity dimensions and the pressure distribution and the flow dynamics, inside and around the cavity, specifically at the closing point has frequently been under consideration. In this study, cavitating flow around cylindrical projectiles with flat or hemispherical heads is considered numerically. To this end, four turbulence models of k-ε-Realizeable, k-ω Standard, k-ω SST, and GEKO, in combination with the Zwart cavitation model are considered using the Fluent software. Flows with a vast range of cavitation numbers (0.1-1.8) are considered in comparison with the experimental and numerical results of other researchers. Our results show that the last turbulence model proposed by Menter, namely the GEnelarilized-KOmega )GEKO( model, in which two extra equations are solved, predicts the results much better, particularly for higher cavitation numbers.

کلیدواژه‌ها [English]

  • Cavitation
  • Flat Cylinder Head
  • Hemispherical Cylinder Head
  • GEKO Turbulence Model

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سابقه مقاله

  • تاریخ دریافت: 28 اسفند 1399
  • تاریخ بازنگری: 28 تیر 1400
  • تاریخ پذیرش: 29 شهریور 1400
  • تاریخ انتشار: 01 خرداد 1400

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