Investigation of radiative heat transfer in complex geometries using blocked-off, multiblock, and embedded boundary treatments
Investigation of radiative heat transfer in complex geometries using blocked-off, multiblock, and embedded boundary treatments
复制标题
DOI：
10.1080/10407780390207697
复制
发表时间：
2003-06-01
影响因子：
2
通讯作者：
Byun, DY
中科院分区：
文献类型：
--
作者：
Byun, DY
在一个复杂的几何形状的辐射传热的预测进行使用不同的边界处理，如阻断，空间多块，和嵌入式边界方法。推导了有限体积法的嵌入边界处理公式。有限体积法（FVM）用于模拟保持等温条件并被冷壁和黑壁封闭的吸收和发射介质中的辐射传输。空间多块处理采用贴体网格系统，其余采用笛卡尔网格系统。他们的结果进行了比较，并讨论了三种不同的情况下，包括梯形外壳，一个半圆形的外壳与内部块，和一个焚化炉形的外壳。每种处理方法的应用所获得的精度是非常令人满意的。因此，每种处理方法都适合于模拟复杂几何形状中的辐射传热。然而，通过截断处理获得的解决方案产生了一些误差，与其他相比，因为截断处理中使用的笛卡尔网格不能精确地配置复杂的边界。特别是非正交壁面上的辐射热流由于其对壁面的逐步描述而被大大低估。
A prediction of radiative heat transfer in a complex geometry is performed using different boundary treatments such as blocked-off, spatial-multiblock, and embedded boundary methods. The formulation of embedded boundary treatment for finite volume is derived. The finite-volume method (FVM) is used to model the radiative transfer in an absorbing and emitting medium which is maintained at an isothermal condition and enclosed by cold and black walls. While the body-fitted grid system is used for the spatial multiblock treatment, the Cartesian grid system is chosen for the others. Their results are compared and discussed for three different cases, including a trapezoidal enclosure, a semicircular enclosure with internal block, and an incinerator-shaped enclosure. The accuracy obtained by application of each treatment is shown to be highly satisfactory. Consequently, each treatment is suitable for modeling the radiative heat transfer in the complex geometry. However, the solution obtained by the blocked-off treatment yields some errors compared with the others, since the Cartesian grid used in the blocked-off treatment cannot configure exactly the complex boundaries. Especially, the radiative heat flux on the nonorthogonal wall is largely underestimated due to its stepwise description of the wall.