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A non-body conformal grid method for simulations of laminar and turbulent flows with a compressible large eddy simulation solver.

机译：使用可压缩大涡模拟求解器模拟层流和湍流的非体保形网格方法。

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摘要

A non-body conformal grid method for simulation of laminar and turbulent flows within complex geometries is developed and incoporated into a compressible large eddy simulation (LES) solver. The underlying finite volume solver for the filtered compressible Navier-Stokes equations is based on a second-order dual-time step approach with preconditioning for low Mach number flow simulations. The time marching was done with an implicit lower-uppersymmetric-Gauss-Seidel (LU-SGS) scheme. The small scale motions were modeled by a dynamic subgrid-scale (SGS) model. The code was developed in a multiblock framework and parallelized using the message passing interface (MPI).;To satisfy the boundary conditions on an arbitrary immersed interface, the velocity field at the grid points near the interface is reconstructed locally without smearing the sharp interface. To treat the moving interface situation, a field extension strategy is used which resolved the velocity and pressure issues when a moving solid grid point becomes a fluid grid point.;A variety of laminar and turbulent flow problems are considered to validate the accuracy and range of applicability of the method. In particular, flow over a circular cylinder with different Reynolds numbers and Mach numbers is simulated and an order of accuracy analysis is conducted. A turbulent pipe flow is also solved with a Cartesian grid and good agreement of the simulation results with experimental results validates the capability of the current solver in turbulent flow simulations. Then a rectangular duct containing a cylindrical rod is studied and the simulation results are compared to those obtained from body-fitted grid methods. Next, turbulent heated flow simulations with a non-body conformal grid method are discussed. Laminar flow over a heated cylinder with different Reynolds numbers and temperature ratios is simulated first. The characteristic flow properties such as drag and lift coefficients, Strouhal number and Nusselt number are compared to experimental results. Then the simulation of heated turbulent pipe flow with an isoflux boundary condition is presented using the non-body conformal grids. To demonstrate the applicability of the non-body conformal grid method in compressible flows, transonic and supersonic flow over a cylinder are simulated and qualitative results are studied. Next flow over an oscillating cylinder is studied to demonstrate the capability in solving flow over moving objects. Finally, as a representative of complex geometry flow, subchannel flow surrounding two cylindrical rods in a rectangular duct is studied and the simulation results are compared to simulation and experimental results by other investigators.
机译：开发了一种用于模拟复杂几何形状内的层流和湍流的非人体保形网格方法，并将其并入可压缩的大涡流模拟（LES）求解器中。滤波后的可压缩Navier-Stokes方程的基础有限体积求解器基于具有低马赫数流模拟的预处理的二阶双时间步方法。时间行进是使用隐式下上对称高斯-赛德尔（LU-SGS）方案完成的。小规模的运动是通过动态亚网格规模（SGS）模型建模的。该代码是在多块框架中开发的，并使用消息传递接口（MPI）进行了并行化；为了满足任意浸入式接口的边界条件，在接口附近的网格点处的速度场是在不弄脏尖锐接口的情况下本地重建的。为了处理运动界面情况，使用场扩展策略来解决当移动的实心网格点变为流体网格点时的速度和压力问题。;考虑了各种层流和湍流问题，以验证流场的精度和范围该方法的适用性。特别地，模拟了具有不同雷诺数和马赫数的圆柱体上的流动，并进行了精度分析的顺序。笛卡尔网格也解决了湍流问题，仿真结果与实验结果吻合良好，验证了电流求解器在湍流仿真中的能力。然后研究了包含圆柱形杆的矩形风管，并将模拟结果与通过体网格方法获得的结果进行了比较。接下来，讨论了利用非共形网格方法进行的湍流热流模拟。首先模拟具有不同雷诺数和温度比的加热气缸上的层流。将流动特性如阻力系数和升力系数，斯特劳哈尔数和努塞尔数与实验结果进行了比较。然后，利用非体形保形网格，对等流边界条件下的热湍流管道流动进行了仿真。为了证明非本体共形网格方法在可压缩流中的适用性，对圆柱体上的跨音速和超音速流进行了模拟，并对定性结果进行了研究。研究了振荡缸上的下一个流动，以证明解决移动物体上的流动的能力。最后，作为复杂几何流动的代表，研究了矩形管道中围绕两个圆柱杆的子通道流动，并将模拟结果与其他研究人员的模拟和实验结果进行了比较。

著录项

  • 作者

    Wang, Wen.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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