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首页> 外文期刊>Granular matter >Modeling of high speed gas-granular flow over a 2D cylinder in the direct simulation Monte-Carlo framework
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Modeling of high speed gas-granular flow over a 2D cylinder in the direct simulation Monte-Carlo framework

机译：在直接模拟蒙特卡洛框架中对2D圆柱体上的高速气态颗粒流进行建模

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摘要

In this work, we propose a new computational model to carry out gas-granular flow dynamics within the framework of the direct simulation Monte-Carlo method. The effect of granular particles in hypersonic flow of argon over a 2D cylinder is investigated. In this computational model, the gas-gas collisions are modeled through regular procedures of the direct simulation Monte-Carlo method. The granular particle is considered as a hard solid sphere undergoing inelastic collisions with gas and granular particles. The granular-granular particle collisions are modeled deterministically while considered dissipative with a finite coefficient of restitution. On the other hand, gas-granular interaction is modeled by the consideration of volumetric forces ( drag) exerted by gas on the granular particles. In addition to the drag, the skin friction heating associated with gas-granular interaction is also modeled in the present work. The total loss of collision energy in a cell during dissipative granular-granular and gas-granular interactions is then accommodated as heat locally to the surrounding gas. With the new computational approach in hand, we have tested gas-granular flow dynamics in high speed flow regime. We have brought out the important effects of granular particles on pure gas flow structures, such as shocks, wakes, and flow/surface properties in high speed flows.
机译：在这项工作中，我们提出了一种新的计算模型，以在直接模拟蒙特卡洛方法的框架内进行气体颗粒流动动力学。研究了颗粒颗粒在2D圆柱体上超音速氩气流中的作用。在该计算模型中，通过直接模拟蒙特卡洛方法的常规程序对气体-气体碰撞进行了建模。粒状颗粒被认为是与气体和粒状颗粒发生非弹性碰撞的硬质固体球体。确定性地对粒-粒粒子碰撞进行建模，同时考虑其耗散性与有限的恢复系数。另一方面，通过考虑气体在颗粒上施加的体积力（阻力）来模拟气-粒相互作用。除阻力外，在当前工作中还模拟了与气-粒相互作用相关的皮肤摩擦加热。然后，在耗散的颗粒-颗粒和气体-颗粒相互作用期间，单元中碰撞能量的全部损失被作为热量局部吸收到周围的气体中。借助新的计算方法，我们已经在高速流动状态下测试了气粒流动力学。我们已经提出了颗粒状颗粒对纯气体流动结构的重要影响，例如冲击，尾流以及高速流动中的流动/表面特性。

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