مطالعۀ جریان آشفتۀ شتاب‌دار درون لوله با استفاده از مدل‌های آشفتگی مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

• محمد افسری
• مجید ملک جعفریان

بیرجند

10.22067/fum_mech.v27i2.26852

چکیده

در پژوهش حاضر، جریان آشفتۀ شتاب‌دار خطی در یک لوله برای حوزۀ متغیر از اعداد رینولدز، به‌وسیلۀ پنج مدل مرسوم جریان آشفته شبیه سازی می شود. مدل های آشفتگی موردنظر، مدل جبری بالدوین-لومکس (BL)، مدل یک معادله ای اِسپالارت-آلماراس (SA)، مدلk-ω، مدلk-ε با تصحیح دیوارۀ لام- برِمهورست و مدل k-ε-v2 می باشند. هدف، مطالعۀ دقیق تر جریان و بررسی کارایی و قابلیت مدل‌های مذکور در پیش‌بینی تنش برشی دیواره، تنش رینولدز، لزجت آشفتگی، تأخیر زمانی در پاسخ و سرعت متوسط می باشد. هم‌چنین تغییر عواملی نظیر قطر لوله، نوع سیال، رینولدز اولیۀ شتاب و نرخ شتاب دهی و تأثیر آن بر پارامترهای فوق به‌دقت مورد بررسی قرار می گیرد. به‌منظور راستی‌آزمایی، نتایج حاصل از مدل های آشفتگی با نتایج تجربی و عددی (مدل سازی آشفتگی و شبیه سازی گردابه های بزرگ) دیگر محققان مقایسه گردیده است. نتایج نشان از دقت مطلوب نتایج حاصل از مدل سازی یک‌بعدی جریان آشفتۀ شتاب دار در مقایسه با نتایج شبیه‌سازی گردابه‌های بزرگ (سه‌بعدی) دارد. هم‌چنین تأخیر در پاسخ آشفتۀ پیش بینی شده به‌وسیلۀ مدل ها (به‌جز مدلBL )، تطابق نسبتاً خوبی با مقادیر آزمایشگاهی نشان می دهد. مقایسۀ توزیع سرعت متوسط، انرژی جنبشی آشفته و لزجت آشفتگی نشان از دقت بهتر مدل
k-ε-v2 نسبت به سایر مدل ها دارد.

کلیدواژه‌ها

• جریان آشفتۀ شتاب دار
• تأخیر زمانی
• تنش رینولدز
• مدل آشفتگی

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عنوان مقاله [English]

Accelerated Turbulent Pipe Flow Study using Various Turbulence Models

نویسندگان [English]

• Mohammad Afsari
• Majid Malek Jafarian

Birjand

چکیده [English]

In this paper, linear accelerated turbulent pipe flow has been simulated at various Reynolds numbers using five common turbulence models. The models considered are the Baldwin-Lomax algebraic model, the Spalart-Allmaras one-equation model, the κ-ε model with wall correction of Lam and Bremhorst, the κ-ω model and the κ-ε-ν2 model. The goal is to evaluate the performance and precision of these models for prediction of the wall shear stress, Reynolds stress, turbulence viscosity, delay time in response and mean velocity. Factors such as changes in pipe diameter, fluid type, initial Reynolds number of acceleration and rate of acceleration and its effect on the above parameters has examined carefully. In order to verify the results, the experimental and numerical results (turbulence modeling and Large Eddy Simulation) of other researchers have been compared with the present results. The results show the desired accuracy of the one-dimensional modeling of accelerated turbulent pipe flow in comparison with Large Eddy Simulation results (three-dimensional). The response of delay time, simulated by the models (except BL model) shows relatively good agreement with experimental data. Comparing the distribution of mean velocity, turbulent kinetic energy and turbulent viscosity shows κ-ε-ν2 model leads to a better accuracy compared with the other models.

کلیدواژه‌ها [English]

• Accelerated turbulent flow
• Delay time
• Turbulence shear stress
• Turbulence model

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