A propbr data structure is used to assist grid generation for different geometric dimensions . a concept of entropy in broad sense is proposed for convective - diffusive problems in chapter 7 . it is proved that there is an intrinsic relationship between the stability of the numerical schemes of the convective - - diffusive differential equations and the non - negative property of the entropy generation caused by the effective diffusion 第七章提出了对流扩散问题中的广义熵概念，研究了扩散熵产非负性特征与数值格式稳定性的内在联系，分析证明了扩散熵产非负定性及统计非负定性的稳定性准则，探讨了稳定性与仿真性之间的矛盾与联系。
