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首页> 外文期刊>Journal of Mechanical Science and Technology >Comparison of the blocked-off and embedded boundary methods in radiative heat transfer problems in 2D complex enclosures at radiative equilibrium
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Comparison of the blocked-off and embedded boundary methods in radiative heat transfer problems in 2D complex enclosures at radiative equilibrium

机译：辐射辐射围绕辐射平衡辐射传热问题的封闭和嵌入边界方法的比较

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摘要

Radiative heat transfer in participating media at radiative equilibrium in two-dimensional complex geometries will be investigated using two Cartesian boundary treatments, i.e. the blocked-off method and the embedded boundary method. The main advantages of Cartesian formulation are to simplify grid generation and using efficient Cartesian solvers for complicated problems. Angular and spatial discretization of the radiative transfer equation are performed using the discrete ordinates method and the finite volume method, respectively. The accuracy of both methods in solution of radiative heat transfer problems in irregular geometries are verified by comparison with benchmark solutions from literatures. Then, in order to investigate all features of the blocked-off and embedded boundary methods, two radiative problems with complex enclosures that contain gray absorbing and emitting medium at radiative equilibrium are examined. The results obtained from the two methods are compared with each other as well as with results obtained by body-fitted grid system. It has been shown that for a medium at radiative equilibrium with Cartesian formulation, the embedded boundary method is the method of choice, especially for calculations near the complex boundaries. It should be noted that for optically thick media, both blocked-off and embedded boundary methods show poor performance.
机译：参与介质在二维复杂几何形状下的参与介质中的辐射传热将使用两个笛卡尔边界处理来研究，即封闭方法和嵌入边界方法。笛卡尔配方的主要优点是简化网格生成，并使用高效的笛卡尔求解器进行复杂问题。使用离散坐标方法和有限体积方法分别执行辐射传递方程的角度和空间离散化。通过与来自文献的基准解决方案的比较，通过与来自文献的基准解决方案进行了验证了两种方法的准确性。然后，为了研究封闭和嵌入边界方法的所有特征，检查了两个具有在辐射平衡的灰色吸收和发射介质的复杂外壳的两个辐射问题。从两种方法获得的结果彼此比较，以及通过体拟合电网系统获得的结果。已经表明，对于用笛卡尔配方进行辐射平衡的介质，嵌入边界方法是选择的方法，特别是对于复杂边界附近的计算。应该注意的是，对于光学厚的介质，封闭和嵌入的边界方法都表现出差的性能。

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