Institute of Mathematics;
Shandong University;
Jinan 250100;
China;
Shandong Applied Financial Theory and Policy Research Base;
Jinan 250100;
China;
School of Economics;
Shandong University;
Jinan 250100;
China;
College of Mathematics and Econometrics;
Hunan University;
Changsha 410082;
China;
three-dimensional semiconductor device of heat conduction; block-centered upwind difference on a changing mesh; local conservation of mass; convergence analysis; numerical computation;