Numerical Study Of Compressible Flows And Heat Transfer In Les Methord Based On OpenFOAM

Since the complexity of turbulent flow, it is difficult to show accurate prediction for the engineering applications by the Computational Fluid Dynamic(CFD) method. Turbulent problems are the major challenge of CFD and limiting the development of industry. With the rapid development of computational fluid dynamics technology, increasingly mature of computer technology, the large eddy simulation method is playing a more and more important role in revealing the mechanism of complex flow phenomena.This work has made full use of the programming mod el based on an outstanding open source software which is a tool library of CFD written in C++ under Linux system.On the basis of the solver rho Pimple Foam, the work extends it at boundary condition and data processing level in the program to as sess the suitability of the large eddy simulation for complex flow. And the new program is applied to calculate classic cases,such as the turbulent separated and reattaching flow over backward-facing step and the turbulent cooling process of the turbine blade internal cooling. It showed a good agreement between the pressent numerical results and the existing experimental and numerical data, indicating that the large eddy simulation is very promising to apply to the actual complex flows and the study of heat transfer, and then hope it can play a vital role in calcutating the internal cooling structure of turbine blades in the future.In this paper, the establishment of the compressible turbulent transient solver rho Pimple Foam was initially summed up in detail. According to the fundamental algorithm of large-eddy simulation method, compressible LES governing equations in the filtering and integral form were derived. Based on the existing solution module with the finite volume method, turbulence model as well as the fexible preand post-processing utilities, the driven cavity viscous flow and one-dimensional shock tube problems were numerically simulated to validate the validity and reliability of the Open FOAM system on numerical simulation. On the premise of the above content, the source code has changed for secondary development through programming. Furthermore, the work has finished compiling and running code of the turbulence model Partially Averaged Navier Stokes, same as the fluctuating inflow conditions used in synthesis method of the random number for large eddy simulation. And it has also discussed the convergence acceleration technology such as parallel computing. In addition, it is maintained that the turbulent separated and reattaching flow over backward-facing step was used to validate the new code LESinlet based on former researches of rho Pimple Foam. The influence of numerical methods for backward-facing step turbulent flow problems was disscussed. A ribbed two-channel cooling structure model provided in CFX and Open FOAM platform are finally simulated respectively. Some continuous research on Rho Porous MRFPimple Foam was done on the basis of rho Pimple Foam, especially the effort of rotation to the aerodynamic performance and heat transfer phenomena of the two-channel. The results are as follows: static dual channel’s turning position has the biggest heat transfer intensity, rotation vastly increases heat transfer intensity in first channel pressure surface and also promotes wall heat transfer intensity more evenly; Rotation raises heat intensity at the same time cause larger pressure losses.