Reply To: non-physical negative uds concentrations with small diffusion coefficient

[grayg34]

Yes I am aware that uds sinks can create negative concentrations if not properly linearized. However, I do not have any sources/sinks for the uds equation. There are only sinks in the background flow equations aand they are not located where the negative concentration occurs. The background flow sinks are located within that smaller rectangle but not on the outside edges.