فناوری در مهندسی هوافضا

فناوری در مهندسی هوافضا

شبیه سازی میدان جریان گاز رقیق بر روی یک صفحه تخت در شرایط پایا و ناپایا به روش دی اس ام سی

نوع مقاله : علمی پژوهشی

نویسندگان
1 دانشجوی ارشد، دانشکده مهندسی مکانیک، دانشگاه صنعتی شاهرود، سمنان، ایران
2 استادیار، دانشکده مهندسی مکانیک، دانشگاه صنعتی شاهرود، شاهرود، سمنان، ایران
چکیده
در این پژوهش میدان جریان گاز اطراف یک صفحه تخت به کمک روش مستقیم مونت کارلو در شرایط غیر تعادلی شدید از نظر رقیق بودن چگالی جریان، زاویه حمله بالا و نوسانات جریان با استفاده از روش دی اس ام سی مورد شبیه‌سازی عددی قرار گرفته است. ازآنجایی‌که در شرایط فضا محاسبه نیرو‌ی آیرودینامیکی ضریب درگ بسیار حیاتی است و از طرفی، استفاده از حلگرهای مرسوم به دلیل فرض پیوستگی ناکارآمد هستند، روش حاضر می‌تواند بسیار کاربردی باشد. نتایج حاصل از یک صفحه تخت در شرایط جریان گاز رقیق، سرعت‌ و زاویه حمله‌های مختلف استخراج شده، و نتایج حاصل با مراجع دیگر اعتبار‌سنجی شده و دقت مناسب گزارش شده‌است. در ادامه، جهت توسعه نتایج پارامترهای موثر بررسی و خواص جریان در حالتهای مختلفی همچون تغییر سرعت و زاویه حمله در حالات مختلف مورد بررسی قرار گرفته  است. همچنین، در حالت ناپایا و تغییر خواص شرایط شبیه‌سازی در هنگام اجرا (گذر زمان)، شبیه‌سازی توسعه یافته‌است. نشان داده شده‌است که در صورتی که سرعت جریان در حالت پایا از 500 متر بر ثانیه به 2000 متر بر ثانیه زیاد شود، ضریب پسا در لبه حمله ۵ برابر افزایش یافته و همچنین در حالت جریان ناپایا با افزایش زاویه حمله از صفر به 16 درجه، ضریب پسا ۳ برابر و انتقال حرارت حدود ۲ برابر کاهش خواهد یافت
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Simulation of the Flow Field of Rarefied Gas on a Flat Plate in Steady and Unsteady Conditions by the DSMC Method

نویسندگان English

parisa jafari 1
Ramin Zakeri 2
1 M. Sc. Student, Faculty of Mechanical Engineering, Shahrood University of Technology, Semnan, Iran
2 Assistant Professor, Faculty of Mechanical Engineering, Shahrood University of Technology, Semnan, Iran
چکیده English

The rarefied gas flow field around a flat plate was numerically simulated under extreme non-equilibrium conditions using the Direct Simulation Monte Carlo (DSMC) method, considering low flow density, large angles of attack, and inherent unsteadiness. Accurately determining aerodynamic forces, particularly the drag coefficient, is critical in spaceflight scenarios, where continuum-based solvers often fail due to their underlying assumptions. The DSMC method, by contrast, offers a practical and reliable alternative. Drag behavior was evaluated across a range of velocities and angles of attack, and the numerical results were validated against established reference data, demonstrating strong agreement. To extend the findings, the influence of velocity and angle of attack was further analyzed under both steady and unsteady flow regimes. The simulation framework was adapted to capture transient variations in flow properties over time. Under steady-state conditions, increasing the flow velocity from 500 to 2000 m/s resulted in a fivefold increase in the drag coefficient at the leading edge. In unsteady flows, however, increasing the angle of attack from 0° to 16° resulted in a threefold reduction in drag and a twofold decrease in heat transfer.

کلیدواژه‌ها English

rarefied Gas Flow
Monte Carlo Direct Simulation
Flat Plate
Heat Transfer
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  • تاریخ دریافت 08 اسفند 1402
  • تاریخ بازنگری 06 تیر 1403
  • تاریخ پذیرش 09 تیر 1403
  • تاریخ اولین انتشار 03 شهریور 1403