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一维辐射传递方程的谱方法求解
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摘要
对于辐射传递方程的求解已经发展了很多方法,区域法、热通量法、蒙特卡洛法、离散坐标法等。综合看来,基于微分形式辐射传递方程离散的方法具有很好的适应性,上述传统方法在求解辐射传递方程时各有优点,但也有其本身不可克服的缺点。发展一种高精度、高效率、简便的数值求解辐射传递方程的方法仍然必要。
     谱方法可以很好的克服低阶方法的不足,能高效地得到高精度的计算结果,而其所用的计算方法简便。本文利用谱方法解决半透明介质中的辐射换热问题,主要工作分两部分:
     1.利用谱方法求解一维直角坐标系下的辐射传递方程,分别对不考虑介质散射和考虑介质散射两种情况进行计算,研究了该方法的数值稳定性,并与精确解或其他方法的数值解进行比较。结果表明,谱方法适用于一维直角坐标下辐射传递方程的求解,而且相对于其他方法具有较高的精度。
     2.利用谱方法解决一维球面坐标系下的辐射换热问题以及一维球面坐标系下辐射与导热耦合问题。通过对谱方法求解结果与文献的结果进行比较和误差分析,验证了谱方法能简便、高效、高精度的解决一维球面坐标系下辐射问题以及辐射与导热相耦合的问题。
Many numerical methods have been developed for solving radiative heat transfer problems in semitransparent media, such as, zonal method, heat flux method, Monte-Carlo method, and discrete ordinates method, etc. By comprehensive comparison, the methods based on discretization of the differential form of radiative transfer equation possess very good flexibility. However, there are still some disadvantages existing in the former methods. It is necessary to develop a high accurate, efficient and simple numerical method to solve radiative transfer equations.
     Spectral methods can somewhat overcome the drawbacks of low order methods, and can provide accurate results, while their solution procedures of spectral methods are something efficient and simple. The author develops and studies the characteristics of spectral methods to solve radiative transfer equation in semitransparent media. The present research contains two parts:
     1. The spectral method is used to solve radiative transfer equation in one-dimensional Cartesian coordinate systems. The numerical stability of spectral methods is investigated for solving radiative heat transfer under the both cases of non-scattering media and scattering media. The present numerical solutions are compared with those of references by exact or other numerical methods. The results show that the spectral methods have good accuracy and efficiency for solving one-dimensional radiative heat transfer problems.
     2. Spectral methods are presented to solve radiative heat transfer equations and coupled conduction-radiation problems in spherical media. An error comparison is made between present results and those from references. The final conclusions can be obtained that:the spectral methods can be used to solve radiative heat transfer alone, and can also to solve the coupled conduction-radiation problems in one-dimensional spherical media system efficiently.
引文
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