بررسی عددی برهمکنش سیال-سازه برای پره انعطاف پذیر غیرمتصل در پشت یک استوانه دایره‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی، دانشگاه خلیج فارس، بوشهر، ایران

چکیده

یکی از چالش بر انگیزترین پدیده‌های مشاهده شده در محیط پیرامون، برهم‌کنش سیال-سازه است که می‌تواند نقش عمده‌ای در انتقال حرارت، کاهش نیروی پسا و برآ و همچنین برداشت انرژی داشته باشد. امروزه از این پدیده که برگرفته از پدیده‌های مشابه در طبیعت است برای افزایش بازده تجهیزات در حوزه مهندسی همچون توربین‌های بادی استفاده می‌شود. رفتار دینامیکی سازه‌های انعطاف‌پذیر در کنش با سیالات، به عنوان یک بحث در حال تکامل مهندسی در حوزه‌های صنعتی شامل سازه‌های استاتیکی، وسایل و شناورهای دریایی، مبدل‌های حرارتی و همچنین انتقال سیال شناخته می‌شود. در این پژوهش اثر بکارگیری پره‌‌ی انعطاف پذیر غیر متصل به استوانه دایره‌ای در جریان تراکم ناپذیر ناپایا با رژیم آشفته در حالت دوبعدی بررسی می‌گردد. همچنین جهت شبیه‌سازی عددی این مسئله، از روش عددی حجم محدود و روش اجزای محدود به صورت هم‌زمان و همچنین برای بررسی جریان آشفته از مدل کا-امگا اس اس تی باتوجه به قابلیت‌های آن استفاده می‌شود. اثر فاصله پره منعطف (0/5، 1و1/5 برابر قطر استوانه)، موقعیت قرار گرفتن آن ( بالادست یا پایین دست استوانه) و مدول یانگ بر مشخصات حرارتی و هیدرودینامیکی جسم بررسی گردید. نتایج نشان داد تاثیر موارد بررسی شده بر الگوی جریان، عدد ناسلت و ضرایب پسا و برا قابل توجه است. همچنین مقایسه حالت انعطاف‌پذیر پره با حالت صلب آن، نشان داد که انتقال حرارت تا 5% افزایش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical investigation of fluid-structure interaction of a detached flexible plate behind a circular cylinder

نویسندگان [English]

  • Iman Zahed
  • Yasser Amini
  • Ehsan Izadpanah
Department of Mechanical Engineering, Persian Gulf University, Bushehr, 75169, Iran
چکیده [English]

Fluid-structural interaction is one of the most challenging phenomena observed in the surrounding environment, which can play a major role in increasing heat transfer, reducing drag and lift coefficients, energy dissipation, and reducing pressure drop. By inspiration from similar phenomena in nature, the dynamic behavior of flexible structures that interact with fluid is recognized as a novel application in industrial processes such as marine equipment, heat exchangers, and fluid transports. So, this phenomenon should be considered as a way to increase efficiency, eliminate defects, and prevent possible damage in industrial issues on a smaller scale. In this study, the effect of a detached flexible plate, which is placed at a specific distance from a circular cylinder, on aerodynamic and thermal parameters is investigated. This study is simulated by the finite volume method and the finite element method, simultaneously, and also kw-SST model is considered as the turbulent flow model. The fin is placed at different distances of 0.5D, 1D, and 1.5D in upstream and downstream of the circular cylinder, where D is the diameter of the cylinder. The results show that placing the fin at a distance 1D from cylinder downstream increases the Nusselt up to 5%. Moreover, the maximum reduction of the drag coefficient is obtained in this situation.

کلیدواژه‌ها [English]

  • Fluid-structure interaction
  • Flexible fin
  • Vortex Shedding
  • Heat transfer
  • Turbulent flow

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 55، شماره 7
مهر 1402
صفحه 819-836

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