Dissertation > Excellent graduate degree dissertation topics show

An Auto-disposal Technology of Overlap Grid Methed and Its Application on CFD

Author: PangYuFei
Tutor: LiZuo
School: National University of Defense Science and Technology
Course: Fluid Mechanics
Keywords: CFD overlap grid ADT analysissitus
CLC: TP274
Type: Master's thesis
Year: 2005
Downloads: 255
Quote: 1
Read: Download Dissertation

Abstract


Grid generation is a pivotal technology of CFD(Computational Fluid Dynamics).Follow the complication of problem in CFD field, the grid generation technology has developed in two ways: in the first place, it improved grid generation method to adopt the increasingly complicated figuration; on the other hand, it developed new methods to deal with the problem including fluctuant surface, such as multi-body separation problem etc. Among this ways, the overlap grid technology is a vive research aspect.Of course overlap grid also has its shortcoming: in the application of this method, the pre-disposal process of computational grid to find the interpolating connection, so-called“dig-hole”process, is hardly to proceed automatically. For a long time, user must complete this step with a series of complex methods by hand, and this problem became the choke point in application and development of overlap grid technology.In the moving-grid problem with fluctuant shape, the pre-disposal process of overlap grid is a main difficulty. The conventional ways has low efficiency, which result in the application of overlap grid in moving-grid problem, which need re-disposes the interpolating connection in every step in time direction, is very difficult considering the computational efficiency.Aim at the above problem in application of overlap grid, this paper using an new manner rooting in analysissitus to put forward a“method of distinguishing points of intersection”and develop corresponding computational soft, which could realize the automatic and shape-independent pre-disposal process for overlap grid.To deal with the problem of low efficiency for pre-disposal process in moving-grid, this paper bring forward the“Mosaic”method and ADT method which based on the huge memory of modern computer. This method has different consideration with conventional ways, it can reduce the disposal time for almost 100 times, and resolve the efficiency problem successfully.With the help of research in this paper, the capability of using overlap grid has been improved greatly and many old work based on structural-grid, such as difference scheme, turbulence model, can be used in moving-grid field of overlap grid technology and expand our research field for CFD remarkably.

Related Dissertations

  1. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  2. Physically Based Real-Time Fluid Simulation Technique,TP391.41
  3. Digital Simulation of Temperature in Modern Greenhouse,S625.51
  4. Study on the Characteristics and Simulation of the Hydrocyclone Reparation Process for Initial Rainwater,X522
  5. Research on the Characteristics of Low Wind Speed Startup Vertical Axis Wind Turbine,TK83
  6. Research on Parameter Optimization for Variable Pitch Control of Vertical Axis Wind Turbine,TK83
  7. Numerical Simulation of cascade wake vortex changes,TK733.1
  8. Parametric design of the diesel engine inlet passage,TK422
  9. The length of the blade Francis turbine research based on CFD,TK733.1
  10. CFD Simulation Analysis of Diesel Locomotive Intercooler Performance,TK423
  11. CFD Analysis of Water Jacket Flow Field in Multi-cylinder Diesel,TK421
  12. Simulation of In-Cylinder Flow and Composition Distribution of a Gasoline HCCI Engine with Variable Valve Actuation,TK411
  13. Research of the Improvement of a Small Gasoline Engine Based on CFD,TK412
  14. Numerical Simulation and Experimental Research on Hump District of Francis Pump-turbine,TK733.1
  15. Study Numerical Simulation of Air Distribution and Air Quality Evaluation in Air-Conditioned Office,TU831
  16. Study on Uniformity of Train Air Supply System and Air Distribution Optimization of Car,U270.383
  17. Study on Variable Cross-Section Duct Air Supply System with Spiral Duct Used in Trains,U270.383
  18. Numerical Investigation on Pneumatic Performances and Infrared Radiation Characteristics of An S-shaped Tunnel Single Expansion Ramp Nozzle,V231.1
  19. CFD Calculation for the Solenoid Pilot Valve Used in Electro-hydraulic Controlled Hydraulic Support,TH137.52
  20. Numerical Simulation on Flow in Airlift Bioreactor,TQ019
  21. The Study of Cavitation in Steady State Condition in Diesel Injector Nozzle,TK421

CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system
© 2012 www.DissertationTopic.Net  Mobile