The Research on Borderlines Disposal during the Thernal Calculation of Buried Pipelines

On disposal of the circle borderlines, one of the ways is to use broken lines instead of the circle borderlines, if the broken lines are near the circle enough, the accuracy of the result can be ensured. But during the dividing of the grids, the calculation is complicated, and the sequences can not be used commonly. In the article, the rectangular borderlines are used instead of the circle ones. On the comparison of the two ways, the results are satisfied, and it simplifies the sequence of thermal calculation on buried pipelines.