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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Hybrid atomistic-continuum multiscale method for fluid flow with density variation in microchannels
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Hybrid atomistic-continuum multiscale method for fluid flow with density variation in microchannels

机译：微通道内密度变化的流体混合原子连续体多尺度方法

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摘要

Purpose - This paper aims to extend the hybrid atomistic-continuum multiscale method developed by Vu et at (2016) to study the gas flow problems in long microchannels involving density variations. Design/methodology/approach - The simulation domain is decomposed into three regions: the bulk where the continuous Navier-Stokes and energy equations are solved, the neighbourhood of the wall simulated by molecular dynamics and the overlap region which connects the macroscopic variables (density, velocity and temperature) between the two former regions. For the simulation of long microanochannels, a strategy with multiple molecular blocks all along the fluid/solid interface is adopted to capture accurately the macroscopic velocity and temperature variations. Findings - The validity of the hybrid method is shown by comparisons with a simplified analytical model in the molecular region. Applications to compressible and condensation problems are also presented, and the results are discussed. Originality/value - The hybrid method proposed in this paper allows cost-effective computer simulations of large-scale problems with an accurate modelling of the transfers at small scales (velocity slip, temperature jump, thin condensation films, etc.).
机译：目的-本文旨在扩展Vu等（2016）开发的混合原子连续体多尺度方法，以研究涉及密度变化的长微通道中的气体流动问题。设计/方法/方法-模拟域分解为三个区域：求解连续Navier-Stokes和能量方程的主体，通过分子动力学模拟的壁的邻域和连接宏观变量（密度，前两个区域之间的速度和温度）。为了模拟长的微/纳米通道，采用了在整个流体/固体界面上具有多个分子嵌段的策略，以精确地捕获宏观速度和温度变化。研究结果-通过与分子区域简化分析模型进行比较，显示了混合方法的有效性。还介绍了可压缩和冷凝问题的应用，并讨论了结果。原创性/价值-本文提出的混合方法可以对大型问题进行经济高效的计算机模拟，并在小规模（速度滑移，温度跃变，薄的凝结膜等）上进行精确的模型转换。

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