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مطالعه وقوع پدیده کاویتاسیون با استفاده از روش شبکه بولتزمن چندفازی و با اعمال معادلات حالت مختلف | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 3، دوره 53، شماره 5 (Special Issue)، مرداد 1400، صفحه 3151-3170 اصل مقاله (2.51 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2020.17997.6705 | ||
| نویسندگان | ||
| اسلام عزت نشان* 1؛ حامد واثق نیا2 | ||
| 1گروه مهندسی هوافضا، دانشکده مهندسی فناوریهای نوین، دانشگاه شهید بهشتی، تهران، ایران | ||
| 2گروه مهندسی هوافضا، دانشکده مهندسی فناوری های نوین، دانشگاه شهید بهشتی، تهران، ایران | ||
| چکیده | ||
| در مطالعه حاضر، یک روش شبکه بولتزمن چندفازی برای شبیهسازی عددی جریانهای کاویتاسیونی توسعه داده شدهاست. برهمکنش و جدایش فازهای مایع و بخار با اعمال روش اختلاف دقیق صورت گرفته و جهت دستیابی به پایداری عددی با حداقل جریانهای غیرفیزیکی و انطباق ترمودینامیکی بهتر نتایج عددی، از معادلههای حالت مناسب استفاده شدهاست. در این راستا، معادلات حالت مکعبی شان-چن و کارناهان-استارلینگ و معادله حالت غیرمکعبی پنگ-رابینسون اعمال شدهاند. دقت و کارآیی الگوریتم با شبیهسازی وقوع کاویتاسیون همگن و غیرهمگن مطالعه شده و نتایج بدستآمده با نتایج دیگران مقایسه شدهاست. الگوریتم توسعهیافته برای بررسی وقوع و رشد حبابهای کاویتاسیونی و دینامیک آن به کار گرفته شده و با استفاده از هر یک از معادلات حالت، تاثیر آبدوستی و آبگریزی سطوح دیواره بر پایداری عددی و نحوه برهمکنش بین جامد و سیال و اثرگذاری آن در چگونگی وقوع پدیده کاویتاسیون در گلوگاه یک نازل همگرا-واگرا مورد مطالعه قرارگرفتهاست. ارزیابی نتایج حاصل از روش حاضر با نتایج موجود در مراجع نشان میدهد که روش شبکه بولتزمن چندفازی با استفاده از یک معادله حالت مناسب، قابلیت و توانمندی بسیار خوبی برای شبیهسازی جریانهای کاویتاسیونی در هندسههای کاربردی را دارا بوده و دینامیک پیچیده حبابهای کاویتاسیونی را بهخوبی تسخیر میکند. | ||
| کلیدواژهها | ||
| وقوع پدیده کاویتاسیون؛ روش شبکه بولتزمن چندفازی؛ معادلات حالت؛ روش اختلاف دقیق | ||
| عنوان مقاله [English] | ||
| Study of cavitation inception using multiphase lattice Boltzmann method with incorporating equations of state | ||
| نویسندگان [English] | ||
| Eslam Ezzatneshan1؛ Hamed Vaseghnia2 | ||
| 1Aerospace Engineering Group, Dep. New Technologies Engineering, Shahid Beheshti University, Tehran, Iran | ||
| 2Aerospace Engineering Group, Faculty of New Technologies Engineering, Shahid Beheshti University, Tehran, Iran | ||
| چکیده [English] | ||
| In the present study, a multiphase lattice Boltzmann method is implemented for simulation of the cavitation bubbles dynamics and characteristics of cavitating flows. The effect of employing various equations of state is investigated on the computing of interaction forces and the phase separation between the liquid and its vapor in the cavitating flows. Herein, the cubic equations of state of Shan-Chen and Carnahan-Starling and the non-cubic equation of state of Peng-Robinson are applied and the exact difference method is imposed to improve the numerical stability. The efficiency of the present method is examined by comparison of the results obtained for the homogeneous and heterogeneous cavitation with those reported in the literature. Then, the implemented multiphase lattice Boltzmann method is used for studying the inception and growth of the cavitation bubbles in the throat of a venturi. The effect of hydrophobicity and hydrophobicity of the nozzle wall on the cavitation dynamics is investigated and a detailed discussion is made for the results from the physical point of view. Evaluation of the present results shows that the multiphase lattice Boltzmann method with incorporating an appropriate equation of state has an excellent capability for prediction of the bubble dynamics and cavitating flow characteristics in applied geometries. | ||
| کلیدواژهها [English] | ||
| Cavitation inception, Multiphase lattice Boltzmann method, Equations of state, Exact difference method | ||
| مراجع | ||
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