IJE TRANSACTIONS A: Basics Vol. 31, No. 1 (January 2018) 23-30    Article in Press

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M. Dehghan Manshadi and H. Bagheri Esfe.
( Received: July 17, 2017 – Accepted: 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 30cm×30cm test section. An in-house CFD code is developed using the Roe scheme (1981) to simulate the flow field and detect the location of normal shock in the supersonic wind tunnel. A parallel algorithm is implemented 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 پژوهش یک تونل باد مافوق صوت برای تولید جریان با عدد ماخ 3 با یک مقطع تست cm30cm×30 طراحی می­شود. یک کد CFD با استفاده از روش رو (1981) برای شبیه سازی میدان جریان و تشخیص موقعیت شوک عمودی در تونل باد مافوق صوت توسعه داده شده است. یک الگوریتم موازی با استفاده از روش OpenMp برای کاهش زمان محاسباتی بکار برده شده است. همچنین یک معادله برای پیش بینی تعداد مناسب هسته­های کامپیوتر در اجرای برنامه با اندازه­های مختلف شبکه بدست آمده است. در فرایند طراحی تونل باد، ابتدا هندسه نازل با روش مشخصه­ها تعیین می­شود. در مرحله 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 وسیله روش سعی و خطا تعیین می­شود. در نهایت یک هندسه مناسب برای دیفیوزر انتخاب شده که تمامی معیارهای لازم را ارضاء کند.

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