ارزیابی رهیافت URANS در مدلسازی آشفتگی ناپایای جت عرضی در جریان جانبی

نوع مقاله : مقاله پژوهشی

نویسنده

عضو هیات علمی / پژوهشگاه فضایی ایران

چکیده

هدف مقالة حاضر توسعة مدلسازی جریان آشفته ناپایا با استفاده از رهیافت آشفتگی  URANS در عین حفظ راندمان عددی و ارزیابی این روش نسبت به رویکرد RANS در شبیه‌سازی عددی یک جت صوتی در جریان جانبی مافوق صوت است. مدل آشفتگی مورد استفاده در هر دو رهیافت، مدل آشفتگی اسپالارت آلماراس می‌باشد. برای بهبود دقت محاسبات از شبکه‌بندی چندبلوکی باسازمان و برای تسریع محاسبات از روش پردازش موازی به‌روش OMP استفاده شده ‌است. در این مقاله، ابتدا روابط حاکم بر هر دو رهیافت URANS و RANS تشریح می‌شود و سپس کد توسعه‌یافته، برای تحلیل جریان یک جت سه‌بعدی در جریان جانبی مورد استفاده قرار می‌گیرد و نتایج آنها در تشکیل ساختار جریان و توزیع فشار و سرعت با نتایج تجربی مقایسه می‌شود. نتایج بیانگر دقت مناسبتر رهیافت URANS در مدلسازی پدیدة جت صوتی در جریان عرضی نسبت به مدلسازی آشفته RANS می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment of the URANS algorithm in unsteady turbulence modeling of a jet in cross flow

نویسنده [English]

  • Ramin Kamali Moghadam
چکیده [English]

The main goal of the present paper is development of the unsteady turbulence modeling using the URANS algorithm and preservation of numerical performance and assessment of this method respect to the RANS model in numerical simulation of a sonic jet in supersonic cross flow. The turbulence modeling used in both algorithms is the Spalart Almaras model. To improve accuracy of the computations, the structured multi block grid is used and to decrease the computational cost, the OMP parallel processing is applied. In this paper, firstly, the governing equations of both the RANS and URANS are described and then the developed code is used to analyze a 3D jet in cross flow. The results including flow structure, distribution of the pressure and velocity profile are compared with experimental data. The URANS method show more accurate results than the RANS model in numerical simulation of the sonic jet in supersonic cross flow.

کلیدواژه‌ها [English]

  • numerical simulation of turbulence flow
  • URANS and RANS turbulence models
  • jet in cross flow
  • multi block method
  • parallel processing

مراجع

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