College of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan 030024 China;
Collaborative Innovation Center of Taiyuan Heavy Machinery Equipment Taiyuan 030024 China.;
College of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan 030024 China;
Collaborative Innovation Center of Taiyuan Heavy Machinery Equipment Taiyuan 030024 China.;
College of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan 030024 China;
Collaborative Innovation Center of Taiyuan Heavy Machinery Equipment Taiyuan 030024 China.;
College of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan 030024 China;
Taiyuan Institute of China Coal Technology Engineering Group Taiyuan 030006 China;
Three-variable shifted Jacobi polynomials; multi-term fractional-order PDEs; variable coefficients; numerical solution; convergence analysis;