By regarding a linear light source as a directional rectangular light source with infinitesimal width, a simple formula is derived for calculating the diffuse reflection component.

通过将线光源看作一个具有无限细小宽度的有向长方形光源，我们得到了一个计算漫反射分量的简洁公式。

youdao

The FDM numerical analytic method is applied to calculate the fin efficiency of elliptic tube with rectangular fins on which the disturbing holes were dug by using additional source term technique.

采用有限差分数值分析方法，应用温度逐次更新处理技术对不同扰流孔下的椭圆管矩形翅片的肋效率进行计算。

youdao

In the model, the basic grids are sectorial ones, but the source area and near source area is regularly shaped to rectangular grids.

该模型采用扇形网格和正方形网格相结合，以扇形网格为基本框架，而将面源区和近源区划分成正方形网格。

youdao