非構造格子を用いた非球形気泡崩壊時の内部温度場に関する数値解析 : 流体工学,流体機械

抄録

We have improved the numerical scheme based on the boundary element method combined with the finite volume method. Heat transfer inside the bubble is taken into account in this sheme. We apply unstructured adaptive grids inside the bubble, which are generated by Delaunay triangulation, to analyze the temperature field inside the collapsing bubble with the very large deformation. We compare the present numerical results with one-dimensional results for a spherical bubble and numerical results for a nonspherical bubble where the structured grids are used to calculate the heat transfer inside the bubble. The results show that the present method has sufficient accuracy to deal with thermal boundary layers both for spherical and nonspherical bubble collapses. It is also shown that the present scheme is effective for the analysis of a tiny bubble in which the thermal boundary layer near the bubble wall is relatively thick to its radius.