Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 1 (January 2018) 128-135   

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  A LOW COST NUMERICAL SIMULATION OF A SUPERSONIC WIND-TUNNEL DESIGN
 
H. Bagheri-Esfe and M. Dehghan Manshadi
 
( Received: July 17, 2017 – Accepted in Revised Form: September 08, 2017 )
 
 

Abstract    In the present paper, a supersonic wind-tunnel is designed to maintain a flow with Mach number of 3 in a 30cm30cm test section. An in-house CFD code is developed using the Roe scheme to simulate flow-field and detect location of normal shock in the supersonic wind-tunnel. In the Roe scheme, flow conditions at inner and outer sides of cell faces are determined using an upwind biased algorithm. The in-house CFD code has been parallelized using OpenMp to reduce the computational time. Also, an appropriate equation is derived to predict the optimum number of cores for running the program with different grid sizes. In the design process of the wind-tunnel, firstly geometry of the nozzle is specified by the method of characteristics. The flow in the nozzle and test section is simulated in the next step. Then, design parameters of the diffuser (convergence and divergence angles, area of the throat, and ratio of the exit area to the throat area) are determined by a trial and error method. Finally, an appropriate geometry is selected for the diffuser which satisfies all necessary criteria.

 

Keywords    Geometrical Design, OpenMp, Recovery Factor, Roe Scheme, Supersonic Wind-tunnel

 

چکیده    در این مقاله یک تونل باد مافوق صوت برای تولید جریان با عدد ماخ 3 با یک مقطع تست cm30cm30 طراحی میشود. یک کد CFD با استفاده از روش رُو برای شبیه سازی میدان جریان و تشخیص موقعیت شوک عمودی در تونل باد مافوق صوت توسعه داده شده است. در روش رُو، خواص جریان در طرفهای داخلی و خارجی صفحات سلول با استفاده از یک الگوریتم مبتنی بر بالادست جریان تعیین میشود. کد CFD توسعه داده شده با استفاده از روش OpenMp موازی شده تا زمان محاسباتی کاهش یابد. همچنین، یک معادله برای پیش بینی تعداد مناسب هستههای کامپیوتر در اجرای برنامه با اندازههای مختلف شبکه به دست آمده است. در فرایند طراحی تونل باد، ابتدا هندسهی نازل با روش مشخصهها تعیین میشود. در مرحلهی بعدی، جریان در نازل و محل تست شبیه سازی میگردد. سپس، پارامترهای طراحی دیفیوزر (زاویههای همگرایی و واگرایی، مساحت گلوگاه و نسبت مساحت خروجی به مساحت گلوگاه) به وسیلهی روش سعی و خطا تعیین میشود. در نهایت یک هندسهی مناسب برای دیفیوزر انتخاب شده که تمامی معیارهای لازم را ارضاء کند.

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