Loop on flow. Use module comp2.mod . Two tanks linked by a permeation flux as in JSim program Example 1. How good or bad were they. Replace the stirred tank representation with a partial differential equation and include axial diffusion.
Anatomy is fundamental to modeling for mechanism.
Use module comp2.pde.mod and comp2.pde.par , then start loops. Turn off loops. Run and look at behavioral analysis. Deterministic models foster definitive interpretation. Anatomy-based models refine estimates of parameters and lead to discovery of mechanisms.