It worth to mention the fluid mechanic model was separated after Abaqus 6.16 and since version 2017 the company strat to develop an independent solver for it. Not even solid mechanics but also thermal and fluid mechanic models can be simulated in this software. The provided option by this software creates a great environment to study various models. Before talking about Dflux code, we need to know what the subroutine code is and what Abaqus can do: Abaqus:Ībaqus is an FEA software to analyze models with high complexity.