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بررسی احتمالاتی وقوع کاویتاسیون روی سرریز نیلوفری با کمک مدل سازی عددی و روش سطح پاسخ | ||
| مدل سازی در مهندسی | ||
| دوره 22، شماره 78، آبان 1403، صفحه 201-216 اصل مقاله (1.42 M) | ||
| نوع مقاله: مقاله عمران | ||
| شناسه دیجیتال (DOI): 10.22075/jme.2024.31043.2480 | ||
| نویسندگان | ||
| مسعود غفاری1؛ مهدی اژدری مقدم* 2؛ غلامرضا عزیزیان3؛ محسن راشکی4 | ||
| 1دانشجوی دکتری، گروه مهندسی عمران، دانشگاه سیستان و بلوچستان، زاهدان، ایران. | ||
| 2استاد، گروه مهندسی عمران، دانشگاه سیستان و بلوچستان، زاهدان، ایران. | ||
| 3دانشیار، گروه مهندسی عمران، دانشگاه سیستان و بلوچستان، زاهدان، ایران. | ||
| 4استادیار، گروه مهندسی معماری، دانشگاه سیستان و بلوچستان، زاهدان، ایران. | ||
| تاریخ دریافت: 03 تیر 1402، تاریخ بازنگری: 02 اسفند 1402، تاریخ پذیرش: 14 اسفند 1402 | ||
| چکیده | ||
| تخمین آسیب کاویتاسیون بر روی سرریزهای نیلوفری به دلیل عدم قطعیتهای مؤثر بر ایجاد خلأزایی مانند سرعت بالا و فشار منفی جریان دارای اهمیت زیادی میباشد. در این تحقیق ارزیابی قابلیت اطمینان آسیب کاویتاسیون بر روی نقاط مختلف سرریز نیلوفری سد هراز در کشور ایران با در نظر گرفتن عدم قطعیتهای مدل بررسی شد. با توجه به عدم وجود تابع حالت حدی صریح در تعیین قابلیت اطمینان کاویتاسیون، ابتدا با استفاده از روش لاتین هایپر کیوب ، 35 شبیه‌سازی با کمک آزمون شاپیرو-ویلک بر مبنای مشخصات آماری و توزیع احتمالاتی عدم قطعیتها با در نظرگرفتن همبستگی بین آنها، تولید میشود و با انجام آنالیزهای مدل عددی ANSYS Fluent-3D پاسخ کاویتاسیون برای نمونههای تولیدی بدست میآید و تابع حالت حدی ضمنی برای 4 نقطه بحرانی بر روی سرریز نیلوفری ایجاد میشود. برای تولید تابع حالت حدی صریح از روش سطح پاسخ استفاده شد و سپس با به کارگیری روشهای مرتبه اول، مرتبه دوم قابلیت اطمینان و روش مونت کارلو، قابلیت اطمینان آسیب کاویتاسیون تخمین زده میشود. نتایج نشان میدهند که با استفاده از روش سطح پاسخ میتوان احتمال خرابی کاویتاسیون بر روی سرریز نیلوفری را با خطای ناچیز و دقت قابل قبول تخمین زد. | ||
| کلیدواژه‌ها | ||
| سرریز نیلوفری؛ قابلیت اطمینان کاویتاسیون؛ مدل سازی عددی؛ تابع شرایط حدی ضمنی و صریح؛ روش سطح پاسخ | ||
| عنوان مقاله [English] | ||
| Probabilistic Investigation of Cavitation Occurrence on Morning-Glory Spillways Using Numerical Modeling and Response Surface Method | ||
| نویسندگان [English] | ||
| Masoud Ghaffari1؛ Mehdi Azhdary Moghaddam2؛ Gholamreza Azizian3؛ Mohsen Rashki4 | ||
| 1PhD Student, Civil Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran | ||
| 2Professor, Civil Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran | ||
| 3Associate Professor, Civil Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran | ||
| 4Assistant Professor, Architectural Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran | ||
| چکیده [English] | ||
| Estimating the cavitation damage to morning-glory spillways is quite important due to the uncertainties that affect cavitation (e.g., high velocity, negative flow pressure, etc.). This paper aims to develop the model uncertainties to address the reliability assessment of the cavitation damage to different points of the Haraz Dam morning-glory spillway in Iran. As an explicit limit state function was lacking to determine the cavitation reliability, 35 samples were produced based on the statistical features, probability distribution and inter-correlation of the uncertainties. Using the Latin Hypercube Simulation (LHS) method and Shapiro-Wilk Test, the cavitation response was found for them through the ANSYS Fluent-3D numerical model analyses, and the implicit LSF was created for 4 critical points on the morning-glory spillway. To do so, the Response Surface Method (RSM) was utilized to generate the explicit LSF and the reliability of the cavitation damage was estimated using the Monte Carlo and first and second order reliability methods. The obtained results show that P4, with pf > 80%, is the most critical overflow point whereas the lowest RMSE is between SORM and MCS method. | ||
| کلیدواژه‌ها [English] | ||
| Morning-glory spillway, Cavitation reliability, Numerical modeling, Implicit/explicit limit state function, Response surface method | ||
| مراجع | ||
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