Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 23, No. 2 (April 2010) 169-176   

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  ACCELERATION OF BLUFF BODY CALCULATION USING MDGRAPE-2
 
 
T. K. Sheel
MEMA, University Catholique de Louvain, Batiment Euler, 4 Avenue Goerges Lemaitre
1348 Louvain-La-Neuve, Belgium
tarun.sheel@uclouvain.be - tksheel@sust.edu

S. Obi
Department of Mechanical Engineering, Keio University, Tokyo, Japan
 
 
( Received: August 18, 2009 – Accepted in Revised Form: October 05, 2009 )
 
 

Abstract    Bluff body calculation was accelerated by using a special-purpose computer, MDGRAPE-2, that was exclusively designed for molecular dynamics simulations. The three main issues were solved regarding the implementation of the MDGRAPE-2 on vortex methods. These issues were the efficient calculation of the Biot-Savart and stretching equation, the optimization of the table domain, and the round-off error caused by the partially single precision calculation in the MDGRAPE-2. Finally this technique was applied to calculation of flow around a circular cylinder. The drag and lift coefficient was investigated to check the validity of the proposed method.

 

Keywords    Vortex Method, MDGRAPE-2, Bluff Body, Drag and Lift Coefficient

 

چکیده    در این تحقیق محاسبه بدنه خالی با استفاده از یک کامپیوتر ویژه (MDGRAPE-2) که منحصراً برای شبیه‌سازی‌های دینامیک مولکولی طراحی شده است تسریع شد. سه مساله مهم مربوط به اجرای MDGRAPE-2 در روش‌های گردابی حل شد. این سه مساله محاسبه کارآمد Biot-Sarvat و معادله کشش، بهینه سازی حوزه جدول و خطای گرد کردن حاصل از محاسبه دقیق منقرد جزئی در MDGRAPE-2 بود. در نهایت این تکنیک برای محاسبه جریان در اطراف یک استوانه مدور به کار رفت. ضریب کشش و بلند کردن برای کنترل اعتبار مدل پیشنهادی مورد بررسی قرار گرفت.

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