Reply To: chemical reaction

[Rob]

Which means you're possibly looking at a remnant of the initial condition. In transient models you have a flow time scale (related to velocity and cell size, ie a very small number) and a domain timescale (related to overall volume and volume change rate, often many minutes). If you're not modelling too many times the latter value you may be looking at the result of the short run and it's dominated by the initial condition.