The immersed boundary method (IBM) was developed for the first time in the present study to simulate the radiative heat transfer problems in complex geometries. The pseudo time stepping technique was applied to solve the radiative transfer equation (RTE) using the finite volume method (FVM). Also, the direct forcing-sharp interface was used in IBM. This method was validated with some benchmark problems in two states of pure radiative and combined radiative-conductive heat transfer. Then, the effects of the conduction-radiation parameter and absorption coefficient on heat flux distribution and isotherms were investigated in an enclosure with inner complex bodies. The results indicated that this method acts well in solving the radiative heat transfer problems in complex geometries. Also, due to using unique Eulerian and Lagrangian grids for solving the energy and radiative transfer equations, production of a separate grid is not required in solving combined heat transfer problems. This is one of the most significant features of the presented method.

本研究首次开发了浸入边界方法（IBM），以模拟复杂几何形状中的辐射传热问题。应用伪时间步长技术，使用有限体积法（FVM）求解辐射传递方程（RTE）。另外，IBM中使用了直接强制锐化接口。该方法在纯辐射和组合辐射-导热两种状态下都存在一些基准问题，并得到了验证。然后，研究了具有内部复杂物体的外壳中的传导辐射参数和吸收系数对热通量分布和等温线的影响。结果表明，该方法可以很好地解决复杂几何形状中的辐射传热问题。也，由于使用独特的欧拉网格和拉格朗日网格来求解能量和辐射传递方程，因此在解决组合传热问题时不需要单独的网格。这是所提出方法的最重要特征之一。