Dissertation > Excellent graduate degree dissertation topics show

2D / 3D dynamic mesh movement method

Author: ZhangZhanQun
Tutor: GuanZhenQun
School: Dalian University of Technology
Course: Engineering Mechanics
Keywords: Dynamic mesh Unstructured grids Large mesh deformation Mapping method Spring approximation Elastomer France
CLC: O35
Type: Master's thesis
Year: 2011
Downloads: 186
Quote: 0
Read: Download Dissertation

Abstract


In practical engineering applications which, often encounter complex with a moving boundary unsteady flow problems, such as air elastic deformation, fluid-structure interaction, multi-body separation problems. Computational fluid dynamics is a key issue is how to deal with moving boundaries. Calculation area change over time, calculate the area of ​​the grid should be adjusted accordingly. Grid adjustment method includes moving and heavy mesh grid. Grid moving method only changes the position of the node, the node connection between the topology change. Heavy mesh subdivision is solving regional remeshed. The weight grid subdivision mesh needs to be generated once, and requires the original map information on the mesh to the new grid, these two steps of the large amount of calculation, and is easy to produce an interpolation error, the calculation of the subsequent negative . Therefore, the preferred use of adaptive grid moving method. This paper analyzes several major research and improved grid moving method. First, in the introductory chapter introduces the research background and the research status and analysis of several of today's popular mobile grid algorithm. In the second chapter analyzes and implements spring approximation methods, and ball-vertex method for a simple introduction. Spring mesh approximation method can only handle small deformation problems. For large deformation problems grid, Chapters III and IV, respectively, analyzed and implemented based on a grid moving method Laplacian Equations and elastomers methods. Grid-based mobile Laplacian equation is solved using the finite element method Laplacian equation, will need to be moved directly as a finite element mesh discretization grids were calculated for each element node three coordinate directions of displacement; superimposed on the displacement Previous node coordinates, you can get the updated grid. This paper presents an introduction to the volume factor Laplacian equation based on a grid moving method, allowing a greater angle of moving objects can be rotated and will not appear overlapping grid problems. Laplacian-based method only solve the cubic equation of order n linear algebraic equations, n is the number of nodes in the grid, while demand for elastomer solution of equations method is 3 * n order. Therefore, in solving linear algebraic equations in the process, this method has a smaller amount of calculation. Laplacian equation based methods and compared to the spring approximation, elastomers law computationally intensive, but the handling of large mesh deformation ability. Method comprises the elastomer modulus and Poisson's ratio two parameters, the cell shape control ability. In this paper, elastomers method has been improved to further improve the method's ability to solve large deformation grid.

Related Dissertations

  1. Simulation of the Crane’s Hydrodynamic Coefficients Based on CFD,U674.35
  2. Gas flow adjustable dynamic response of solid rocket ramjet Process,V435
  3. Research on Volume Rendering of CFD Scalar Data and Parallel Rendering,TP391.41
  4. The Numerical Study of Aerodynamic Characteristics of Each Other When High-speed Trains Move on Bridge,U441.3
  5. Numerical Calculation of the Flutter Stablity for Long-Span Suspension Bridge,U441.3
  6. Biomass Transfer Study in Cyro-perservation of Cells,R318.52
  7. The Radial Basis Function Method for Hyperbolic Conservation Laws,O241.82
  8. Study of Coupled Heat Transfer in Participating Medium Based on ANSYS or FLUENT Mixed Programming,TK124
  9. Conjugate Heat Transfer Simulation for Unstructured Grids,V231.1
  10. Profile Design and Numerical Analysis on Air-cooled Roots Vacuum Pump,TB752
  11. The Primary Research for Flow Simulation on Unstructured Grids,O35
  12. Numerical Simulation of Heat Transfer in Flexible Wall,TK124
  13. Numerical Simulations of Water Wave and Its Influence,TB126
  14. Method for Solving Nonlinear Evolution Equations and Researching on the Exact Solutions,O175.29
  15. Figure cell mapping method based on nonlinear stochastic systems globally gear Numerical Solution of,TH132.41
  16. CFD-based sliding bearing transient flow field,TH133.31
  17. Solutions for Two Kinds of Evolutional Equations,O175.29
  18. Study on Management System of Poyang Lake Water Environment Based on Open Source GIS,X524
  19. Numerical simulation of flow of the combustion chamber of the complex charge structures,V435
  20. Numerical analysis of the launch of the box-type UAV gas jet shock,V279
  21. Study of the Calculation Approach of Hydrodynamic Derivatives of Submarine with Outer Carry,O35

CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics
© 2012 www.DissertationTopic.Net  Mobile