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. 

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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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