无网格法在空心弹流场数值模拟中的应用
首发时间:2009-07-20
摘要:本文基于Batina发展的无网格算法思想,引入非结构网格下的耗散模型,给出了无网格法下求解三维Euler方程的具体实现形式,对某空心弹丸在超音速下不同攻角、不同马赫数的绕流流场进行了数值模拟,并分析了其在不同马赫数和不同攻角下的阻力系数、升力系数,与其它算法的结果进行了比较,结果一致。计算结果表明空心弹丸具有很好的低阻特性,其阻力系数和升力系数随攻角以及马赫数的变化规律与普通弹丸一致,而且很好的验证了无网格法在超音速流场数值模拟中的准确性和实用性。
关键词: 无网格法 三维Euler方程 空心弹丸 升力特性 阻力特性
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Flow Field Calculation of Hollow Projectile
Abstract:According to meshless method proposed by Batina, this paper gives the idiographic forms to solve three-dimensional Euler equations. The supersonic flow field around hollow projectile is numerically simulated for different Mach number and different angle of attacks, the drag(lift) coefficients of hollow projectile are analyzed. The simulation result shows that hollow projectile has characteristics of low drag and the corresponding variation between the drag(lift) coefficient and the angle of attacks is the same as common projectile, which is the same as other simulation results based on other grid methods. All these results demonstrate that the proposed meshless method can simulate the supersonic flow field problems accurately and practicability.
Keywords: meshless method three-dimensional Euler equations hollow projectile lift characteristic drag characteristic
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