No convergence in DIFUNo convergence in DIFUhttps://dlt-acc.firelay.cloud/c/message_boards/find_thread?p_l_id=3231581&threadId=54726702026-05-15T21:45:44Z2026-05-15T21:45:44ZNo convergence in DIFUPablo Amadorhttps://dlt-acc.firelay.cloud/c/message_boards/find_message?p_l_id=3231581&messageId=54726692022-11-23T12:20:21Z2022-11-23T12:20:21ZHello, good morning. I am working on a model of a coastal wetland with numerous tributaries. The outflow from the lake to the sea is controlled by gates. The inflows I have introduced in the model as discharges while the outflows as open boundary. Both inlets and outlets are known. When I run the model I get warnings about the Courant number, which is slightly greater than 1.<br /><br />However, now I want to study the distribution of a pollutant in the lake. When I enter the loads I get many warnings; the most worrying one is "No convergence in DIFU for resp. constituent nr. & tstep: 1 8088" and the concentrations become negative from then on. I don't quite understand where the problem lies, as the model reflects the hydrology of the lake very well.<br />I am attaching all the inputs to my model in a zip file if anyone would like to take a look at it. Any suggestions are appreciated.Pablo Amador2022-11-23T12:20:21Z