دانش و فناوری هوافضا

دانش و فناوری هوافضا

ارزیابی مدل‌های آشفتگی K-ℰ در تحلیل عددی جدایش یک محموله از بال دلتا در جریان گذرصوت

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار، گروه مهندسی هواضا، دانشکده و پژوهشکده فنی مهندسی، دانشگاه جامع امام حسین (ع)
2 دانشیار، مجتمع دانشگاهی مکانیک، دانشگاه صنعتی مالک‌اشتر
3 استاد، مجتمع دانشگاهی مکانیک، دانشگاه صنعتی مالک‌اشتر
چکیده
هدف از انجام این تحقیق ارزیابی مدل‌های توربولانسی k-ɛ شامل نسخه‌های استاندارد، Realizable و RNG در تحلیل عددی جدایش محموله در جریان گذرصوت بوده است. یک مدل استاندارد محموله و بال دلتا در نظر گرفته شده است. ابتدا معادلات حاکم بر سیال روی شبکه‌ی محاسباتی ساکن حل شده که طی آن 3 مؤلفه‌ی نیرو و 3 مؤلفه‌ی گشتاور روی محموله بدست می‌آیند. با توجه به این مؤلفه‌ها و وضعیت اولیه، موقعیت جدید بدست آمده است و با الگوریتم شبکه‌ی متحرک، محموله در موقعیت جدید قرار گرفته و معادلات سیال حول شبکه‌ی متحرک حل و همین روند تکرار شده است. نتایج نشان می‌دهد در مدهای پیچ و یاو، نتایج  لزج تفاوت چندانی با تحلیل غیرلزج ندارد و هر دو انطباق مناسبی با نتایج تجربی دارند، اما در مد رول نتایج غیر لزج خطای بسیار زیادی (43 درصد) داشته و با تحلیل لزج میزان قابل توجهی از خطا کاسته شده که مدل توربولانسی k-ɛ نسخه‌ی RNG دارای کم‌ترین خطا (19 درصد) بوده است. همچنین میزان زمان محاسبات در این حالت 32 درصد بیشتر از حالت غیرلزج بوده است.
کلیدواژه‌ها

عنوان مقاله English

Evaluation of K-ℰ turbulence models in numerical investigation of store separation in transition flow

نویسندگان English

Mohamad Ali Jozv Vaziri 1
Alireza Mostofizade 2
Mojtaba Dehghan Manshadi 3
1 Assistant Professor, Department of Aerospace Engineering, Imam Hossein Jame University, Iran.
2 Associate Professor, Faculty of Mechanics, Malek Ashtar University of Technology, Iran.
3 Professor, Faculty of Mechanics, Malek Ashtar University of Technology, Iran.
چکیده English

The aim of this study is the evaluation of k-Ɛ turbulence models in numerical investigation of store separation in transition flow. We have considered a store standard model and a delta wing as an experimental model. Firstly, the fluid governing equations have been solved on fixed computational grid by which three components of force and torque components on store have been obtained. Secondly, according to the components and 6 components of store initial position, the new position after a time step was obtained. Finally, the store was located in a new position and the fluid equations on moving grid were solved and the same process has been repeated. The results show, there is no significant difference between viscous and non-viscous analysis results in pitch and yaw modes and both are compliance with experimental data. In roll mode, the non-viscous analysis results there is a significant error (43 percent) and using viscous analysis the error is reduced significantly (19 percent in kƐ RNG). Also, the calculation time in viscous analysis is 32 percent more than the non-viscous analysis.

کلیدواژه‌ها English

Store separation
Dynamic mesh
Transonic flow
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