mitra

Charlie, thank you very much for your answer. In my case, I received this message : +++++++++ CONVERGENCE FAILURE ON TIME STEP # 5 WITH DT = 0.298023E-05 SECONDS, FOLLOWING TWO STEPS THAT CONVERGED ON ITER = 1 STOP EXECUTION AFTER NEXT TIME STEP ++++++++ REDUCE TIME STEP AT ( 5, 9) ++++++++++++++++ NEW DELT = 0.745058E-06 As far as I know, with decreasing the capillary pressure the flow rate should increase, and I think you are right I may have gotten into an invalid physical state in one or more cells, but the case I defined is physically meaningful, so...? Thanks

I have a problem for simulating an infiltration test with EOS9. I used van Genuchten model with the Sls=.68. I tried to use 3 consecutive simulations (I used the output file from one of them as an initial condition for the second one) with different capillary pressure at the soil surface. In my case, I used Pcap=-50, -20, -10 cm of water. For the first two simulation (-50,-20) I didn’t have any problem and I received the results at the time I defined, but for the last one (-10) I had some problem with the code convergence. Although I defined bigger time steps, the time step decreased to the value of less than a second (10-4) and after two time steps for which convergence on itr=1 happened, the simulation stopped. The soil parameter that I used and the case I am trying to simulate are real, so I don’t know what is the problem with the last simulation? Thanks Maryam