TY - JOUR T1 - Energy Stable Numerical Method for the TDGL Equation with the Reticular Free Energy in Hydrogel AU - Liao , Dong AU - Zhang , Hui AU - Zhang , Zhengru JO - Journal of Computational Mathematics VL - 1 SP - 37 EP - 51 PY - 2017 DA - 2017/02 SN - 35 DO - http://doi.org/10.4208/jcm.1607-m2014-0109 UR - https://global-sci.org/intro/article_detail/jcm/9762.html KW - TDGL equation, Unconditionally energy stable scheme, Adaptive time-stepping method, Phase transition. AB -

Here we focus on the numerical simulation of the phase separation about macromolecule microsphere composite (MMC) hydrogel. The model is based on time-dependent Ginzburg-Landau (TDGL) equation with the reticular free energy. An unconditionally energy stable difference scheme is proposed based on the convex splitting of the corresponding energy functional. In the numerical experiments, we observe that simulating the whole process of the phase separation requires a considerably long time. We also notice that the total free energy changes significantly in initial stage and varies slightly in the following time. Based on these properties, we apply the adaptive time stepping strategy to improve the computational efficiency. It is found that the application of time step adaptivity can not only resolve the dynamical changes of the solution accurately but also significantly save CPU time for the long time simulation.