شبیه‌سازی عددی شناوری اجسام با اصلاح فشار در روش SPH با الگوریتم‌های دلتا و شیفت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشگاه صنعتی مالک اشتر، تهران، ایران

2 استادیار، دانشگاه صنعتی مالک اشتر، تهران، ایران

3 استاد، دانشگاه صنعتی مالک اشتر، شاهین شهر، ایران

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

عنوان مقاله [English]

Numerical Simulation of Floating of Objects with by pressure field correction of SPH Method

نویسندگان [English]

  • Ali Asghar Pirkhalili 1
  • Mahmoud Rostami Varnousfaaderani 2
  • Mojtaba Dehghan Manshadi 3
1 Master's degree, Malik Ashtar University of Technology, Tehran, Iran
2 Assistant Professor, Malik Ashtar University of Technology, Tehran, Iran
3 Professor, 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

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مراجع

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مکانیک سیالات و آیرودینامیک
دوره 11، شماره 2 - شماره پیاپی 30
پاییز و زمستان 1401
اسفند 1401
صفحه 23-36

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سابقه مقاله

  • تاریخ دریافت: 04 مرداد 1401
  • تاریخ بازنگری: 08 آذر 1401
  • تاریخ پذیرش: 20 بهمن 1401
  • تاریخ انتشار: 11 اسفند 1401

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