شبیه‌سازی حرکت جسم جامد در یک سیال نیوتونی با استفاده از یک روش مرزمستور شبه‌طیفی موازی‌شده تاوایی‌مبنا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه هوافضا- دانشگاه آزاد اسلامی-واحد علوم و تحقیقات

2 عضو هیئت علمی-گروه هوافضا-دانشگاه آزاد اسلامی-واحد علوم و تحقیقات- تهران

چکیده

در مقاله حاضر روشی عددی برای شبیه‌سازی اندرکنش‌ دوسویه یک جسم جامد صلب با یک سیال تراکم‌ناپذیر نیوتونی در یک پیکربندی دوبعدی تشریح می‌شود. در این روش مرزهای جامد متحرک توسط توابع پایه شعاعی مدل شده، به یک حل‌گر مرز مستور شبه­طیفی معادلات ناویر-استوکس در شکل تاوایی-سرعت اعمال شده‌اند. در ابتدای هر گام زمانی سرعت­هایی بقایی که شرایط مرز مستور متحرک را نیز ارضاء می­کنند، به همراه یک میدان تاوایی اصلاح شده، مستقیماً و بدون نیاز به تعریف یک تابع نیروی خارجی برای اصلاح جمله‌های جابجایی و پخش، مورد استفاده قرار می‌گیرند. با توجه به استقلال شرط‌مرزی‌های مؤلفه‌های سرعت از یکدیگر، در هر گام زمانی، معادلات پواسن سرعت به‌صورت موازی حل شده‌اند. دینامیک جسم جامد با دقت مرتبه دوم زمانی دنبال می‌شود که در آن نیروهای حاصل از اندرکنش مرز جامد و سیال از یک روش انتگرالی بر پایه تاوایی محاسبه شده‌اند. انتگرال­گیری زمانی از یک روش رانج کوتای مرتبه سوم موازی‌شده انجام شده است. استفاده از حل‌گر سریع شبه‌طیفی به‌همراه موازی‌سازی حل معادلات پواسون سرعت و موازی‌سازی انتگرال‌گیری زمانی؛ در ترکیب با مدل‌کردن مرز جامد با استفاده از توابع پایه شعاعی، الگوریتمی بسیار سریع و کارآمد را نتیجه می­دهد که شبیه‌سازی زمان واقعی را (که نیازمند حداقل 21 نمایش از میدان جریان در هر ثانیه است) امکان‌پذیر ساخته است. دقت و کارایی روش از طریق حل چند مسئله نمونه نشان داده ‌شده ‌است.

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