بررسی عددی جریان لایه ای حول دو استوانه بیضوی با آرایش های مختلف داخل یک کانال، با استفاده از روش شبکه بولتزمن

نویسندگان

1 دانشگاه شیراز

2 دانشگاه شریف

3 دانشگاه تهران

چکیده

در این مقاله جریان دوبعدی آرام حول دو استوانه بیضوی داخل یک کانال با آرایش های مختلف به طور عددی با استفاده از روش شبکه بولتزمن در اعداد رینولدز مختلف بررسی شده است. برای مدل‌سازی شرط عدم لغزش در مرز منحنی جامد از یک شرط مرزی منحنی مرتبه دوم استفاده شده است. روش عددی به همراه شرایط مرزی به کار رفته در شبیه سازی جریان حول یک استوانه دایروی صحت‌سنجی شده است. طبق این نتایج، استوانه اول با توجه به موقعیتش در برابر جریان در آرایش ردیفی بیشترین مقدار نیروی پسا و در آرایش درکنارهم کمترین مقدار آن را دارد. البته، استوانه دوم به دلیل تاثیرپذیری از استوانه اول دارای رفتار پیچیده تری است. برخلاف جریان دائم که در آن بیشترین مقدار نیروی برآ در آرایش درکنارهم بر استوانه ها وارد می شود، در جریان غیردائم به دلیل ریزش گردابه ها و اثرات تداخلی ناشی از وجود گردابه ها در آرایش جابجاشده مقدار نیروی برآی بیشتری بر استوانه‌ها وارد می شود. در ضمن، عدد اشتروهال در آرایش ردیفی از آرایش جابجاشده بیشتر بوده و در آرایش درکنارهم ریزش گردابه مشاهده نشد.

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