Abstract
Numerical simulation is the main method to solve turbulence problems. As one of the three methods which are commonly used in large-eddy simulation model (LES) is the most effective and promising research method. The basic idea of large-eddy simulation is that the large scale turbulent motion is directly simulated and we use the sub- grid scale model to simulate small-scale turbulent motion. Continuing alternative load exists in aero-engine combustion chamber during operation. This coupling phenomenon is an important reason to the combustion chamber fatigue failure. In this paper, the large-eddy simulation methods are described and applied in researching aero-engine combustion chamber multi-physics field coupling analysis. By comparing with the experimental results we verify the feasibility of this method and there is great significance of actual project.
Highlights
Turbulence is a kind of common natural phenomenon whose complexities are consist of randomness, rotation and statistics of motion, but it is difficult to solve turbulence problems because of its nonlinearity and pulsatory extreme wide frequency spectrum domain [1,2]
Numerical simulation and experiments are the main methods used in researching turbulence at present
Following the high speed development of computer technology large-eddy simulation has become the optimal method to solve turbulence problems in that it is able to save a mass of time and computer memory in contrast with direct numerical simulation and deal with insufficient information in RANS method [3], so a growing number of researchers favor it
Summary
Turbulence is a kind of common natural phenomenon whose complexities are consist of randomness, rotation and statistics of motion, but it is difficult to solve turbulence problems because of its nonlinearity and pulsatory extreme wide frequency spectrum domain [1,2]. Numerical simulation and experiments are the main methods used in researching turbulence at present. Following the high speed development of computer technology large-eddy simulation has become the optimal method to solve turbulence problems in that it is able to save a mass of time and computer memory in contrast with direct numerical simulation and deal with insufficient information in RANS method [3], so a growing number of researchers favor it. From combustion to the flow around a circular cylinder till the phenomenon of vortex motion, large-eddy simulation is of irreplaceable functions and commonly used in projects [4]. We make full use of large-eddy simulation method in researching Multi-Physics Coupling by finite element analysis that has important value in practical engineering application
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