School of Mathematics and Statistics;
Changsha University of Science and Technology;
Changsha 410114;
China;
School of Mathematical Sciences;
Queensland University of Technology;
Brisbane;
QLD 4001;
Australia;
Institute of Applied Physics and Computational Mathematics;
Beijing 100088;
China;
Space distributed-order equation; time-fractional diffusion equation; piecewise-quadratic polynomials; finite volume method; stability and convergence;