首页> 外文期刊>Mathematics and computers in simulation >Numerical solutions of unsteady flows with low inlet Mach numbers
【24h】

Numerical solutions of unsteady flows with low inlet Mach numbers

机译:低入口马赫数非定常流动的数值解

获取原文
获取原文并翻译 | 示例

摘要

This study deals with a numerical solution of a 2D unsteady flow of a compressible viscous fluid in a channel for low inlet airflow velocity. The unsteadiness of the flow is caused by a prescribed periodic motion of a part of the channel wall with large amplitudes, nearly closing the channel during oscillations. The channel is a simplified model of the glottal space in the human vocal tract and the flow can represent a model of airflow coming from the trachea, through the glottal region with periodically vibrating vocal folds, and to the human vocal tract. The flow is described by a system of Navicr-Stokes equations for laminar flows. The numerical solution is implemented using the finite volume method (FVM) and the predictor-corrector MacCormack scheme with Jameson artificial viscosity using a grid of quadrilateral cells. Due to the unsteadiness of the grid (motion of the grid), the basic system of conservation laws is considered in a changed form using the Arbitrary Lagrangian-Eulerian (ALE) method. The numerical solution has been carried out for a symmetric and a non-symmetric flow field in two computational domains. The numerical results for unsteady flows in the channel are presented for inlet Mach number M_∞ = 0.012, Reynolds number Re = 5 × 10~3 and wall motion frequency 100Hz. The authors present the numerical solution and simulations of flow fields in the channel, acquired from a program that has been developed exclusively for this purpose. The reason for using a numerical simulation was the lack of data from experimental results of flows through the glottal region, and the capability of such simulation to model the problem.
机译:这项研究涉及可压缩粘性流体在通道中的二维非定常流动的数值解,以降低进气速度。流体的不稳定是由于通道壁的一部分以较大幅度进行规定的周期性运动而引起的,在振荡过程中通道几乎被关闭。该通道是人声道中声门空间的简化模型,并且流动可以表示从气管,通过具有周期性振动的声带的声门区域到人声道的气流模型。用层流的Navicr-Stokes方程系统描述流量。数值解决方案是使用有限体积法(FVM)和具有詹姆逊人工粘度的预测器-校正器MacCormack方案使用四边形单元格来实现的。由于网格的不稳定性(网格的运动),使用任意拉格朗日-欧拉(ALE)方法以变化的形式考虑了守恒定律的基本系统。已经在两个计算域中对对称和非对称流场进行了数值解。对于入口马赫数M_∞= 0.012,雷诺数Re = 5×10〜3和壁运动频率100Hz,给出了通道中非恒定流的数值结果。作者介绍了从专门为此目的开发的程序中获得的通道中流场的数值解和模拟。使用数值模拟的原因是缺乏通过声门区域流动的实验结果得到的数据,以及这种模拟对问题进行建模的能力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号