دوره 14، شماره 27 - ( 4-1397 )
جلد 14 شماره 27 صفحات 48-35 |
برگشت به فهرست نسخه ها
1- دانشگاه آزاد اسلامی واحد اصفهان (خوراسگان)
2- دانشگاه آزاد اسلامی واحد زنجان
3- دانشگاه آزاد اسلامی واحد بندر انزلی
2- دانشگاه آزاد اسلامی واحد زنجان
3- دانشگاه آزاد اسلامی واحد بندر انزلی
چکیده: (5529 مشاهده)
در این مقاله، مسئله ورود به آب یک پرتابه کروی به صورت عددی و آزمایشگاهی شبیهسازی شده است. برای مدلسازی اندرکنش بین سازه و سیال، یک تحلیل دینامیکی صریح با استفاده از فورمولبندی کوپل اویلرین - لاگرانژین که در نرمافزار اجزای محدود آباکوس موجود است، به کار گرفته شده است. مقایسه نتایج شبیهسازی عددی و آزمایشگاهی مربوط به تغییرات جابجایی و سرعت پرتابه کروی در عمق آب بر حسب زمان با نتایج تئوری، تطابق خوب این نتایج با یکدیگر و دقت و کاربرد الگوریتم عددی مورد استفاده را آشکار میسازد. نتایج نشان داد که زمان جدایش حباب، تابع ضعیفی از جرم پرتابه و سرعت برخورد آن با سطح آزاد آب است؛ اما عمق جدایش حباب با افزایش این مولفهها، به طور قابل توجهای افزایش مییابد. همچنین افزایش جرم پرتابه تاثیر نامحسوسی بر استهلاک انرژی ویسکوزیته دارد؛ در حالی که افزایش سرعت برخورد پرتابه با سطح آزاد آب منجر به کاهش استهلاک انرژی میشود.
واژه‌های کلیدی: کوپل اویلرین – لاگرانژین، پرتابه کروی، ورود به آب، زمان و عمق جدایش حباب، انرژی ویسکوزیته
نوع مطالعه: مقاله پژوهشي |
موضوع مقاله:
هیدروديناميك سازه های ساحلی و فراساحلی
دریافت: 1397/1/7 | پذیرش: 1397/3/19
دریافت: 1397/1/7 | پذیرش: 1397/3/19
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