Study On Source Six Flux Method For Radiative Transfer In Participating Medium

Many methods are developed to solve the radiative heat transfer in participating media. However, the methods which can simulate the directional radiative intensity accurately could be divided into two sorts in general. One is based on the photon tracing, such as Backward Monte Carlo Method, and the other is based on the generalized flux method, such as the Discrete Ordinates Method, the Line of Sight (LOS) Method, the Heat Flux Method and etc. Considering the computational precision and efficiency, a Source Six-Flux method based on the traditional Heat Flux method is proposed to calculate the radiative transfer equation (RTE). The result of this method agrees well with that of Monte Carlo Method, which indicates that the present method is suitable for solving the radiative problem.The conclusion can be summarized as follows:1. Several methods that can solve the directional radiative intensity are reviewed, for example, Backward Monte Carlo Method, Discrete Ordinates Method and Traditional Flux Method. The internal relation of these methods is pointed out.2. After analyzing the flux model thoroughly, a Source Six Flux model was proposed without changing the grid and source item. The Source Six Flux method can simulate the radiative intensity in any specified direction conveniently, flexibly, and precisely.3. Considering different temperatures and radiative properties, the radiative transfer problems in participating media with typical geometry are calculated by Source Six Flux Method, Backward Monte Carlo Method, and Two Flux Method, respectively. The feasibility and precision of Source Six Flux Method are validated by comparing the results with BMC.4. The computing domain of the entire exhaust plume is placed in an imaginary cylinder. With the condition of known the flow field, the absorption coefficients and the scattering coefficients of every control volume in the exhaust plume are calculated by using the line-by-line (LBL) integration algorithms and Mie scattering theory. These methods are integrated into the program of Source Six Flux Model to simulate the directional spectral radiation intensity of the exhaust plume.