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شبیه‌سازی عددی شناوری اجسام با اصلاح فشار در روش SPH با الگوریتمهای دلتا و شیفت | ||
| مکانیک سیالات و آیرودینامیک | ||
| مقاله 3، دوره 11، شماره 2 - شماره پیاپی 30، اسفند 1401، صفحه 23-36 اصل مقاله (1.13 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| علی اصغر پیر خلیلی1؛ محمود رستمی ورنوسفادرانی* 2؛ مجتبی دهقان منشادی3 | ||
| 1کارشناسی ارشد، دانشگاه صنعتی مالک اشتر، تهران، ایران | ||
| 2استادیار، دانشگاه صنعتی مالک اشتر، تهران، ایران | ||
| 3استاد، دانشگاه صنعتی مالک اشتر، شاهین شهر، ایران | ||
| تاریخ دریافت: 04 تیر 1401، تاریخ بازنگری: 08 آذر 1401، تاریخ پذیرش: 30 بهمن 1401 | ||
| چکیده | ||
| در این مقاله از روش هیدرودینامیک ذرات هموار (SPH) با شرط مرزی دینامیک برای شبیه‌سازی دوبعدی شناوری اجسام استفاده شده است. نوسانات شدید در میدان فشار و سرعت یکی از مشکلات عمده در این روش است. در این مقاله، نوسانات با استفاده از الگوریتمهای دلتا و شیفت اصلاح شدهاند. شبیه‌سازی عددی با سه مدل لزجت شامل لزجت واقعی سیال (لایهای و آشفته)، سیال ایدئال (بدون لزجت) و لزجت مصنوعی انجام شد. اعتبارسنجی این روش حاکی از آن بود که در حالت لزجت مصنوعی و همچنین سیال ایدئال باید از الگوریتم دلتا و در حالت لزجت واقعی سیال باید از الگوریتمهای دلتا و شیفت استفاده کرد تا تطابق خوبی با دادههای آزمایشگاهی حاصل شود. نهایت با شبیه‌سازی آزمایش شناوری با مدلهای عددی بهینه به دست آمده، نتایج بیانگر این بودند که روش بهینه در حالت لزجت واقعی سیال نسبت به روشهای بهینه دیگر، عملکرد بهتری در مدل‌سازی حرکتهای افقی، عمودی و چرخشی جسم شناور داشته است. | ||
| کلیدواژه‌ها | ||
| هیدرودینامیک ذرات هموار؛ مدلهای لزجت؛ الگوریتمهای تصحیح فشار و سرعت؛ شناوری | ||
| عنوان مقاله [English] | ||
| Numerical Simulation of Floating of Objects with by pressure field correction of SPH Method | ||
| نویسندگان [English] | ||
| Ali Asghar Pirkhalili1؛ Mahmoud Rostami Varnousfaaderani2؛ Mojtaba Dehghan Manshadi3 | ||
| 1Master's degree, Malik Ashtar University of Technology, Tehran, Iran | ||
| 2Assistant Professor, Malik Ashtar University of Technology, Tehran, Iran | ||
| 3Professor, Malik Ashtar University of Technology, Shahin Shahr, Iran | ||
| چکیده [English] | ||
| In this paper, the Smoothed Particle Hydrodynamics (SPH) method with dynamic boundary condition has been used to simulate 2D floating of objects. Severe fluctuations in the field of pressure and velocity is one of the major problems in this method. In this paper, the fluctuations have been corrected using Delta and Shift algorithms. The simulation was numerically performed with three viscosity models including real fluid viscosity (laminar and turbulence), ideal fluid (without viscosity) and artificial viscosity. Validation of this method indicated that in the case of artificial viscosity and also ideal fluid, the Delta algorithm should be used and in the case of real fluid viscosity, using Delta and Shift algorithms could establish good agreement with experimental data. Finally, by simulating the floating experiment with the obtained optimal numerical models, the results showed that the optimal method in the case of real fluid viscosity had a better performance in modeling the horizontal, vertical and rotational movements of the floating body than other optimal methods. | ||
| کلیدواژه‌ها [English] | ||
| SPH, viscosity models, pressure and velocity correction algorithms, floating objects | ||
| مراجع | ||
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