Dear Gerardo, problems with convergence can have thousands of reasons, most common is some problem with non-physical boundary and initial values or other model parameters. Try to get a simple problem running, increase step by step the complexity of your physics, e.g. taking a very small value of the source term first, and so on.
Without knowing this, we cannot help in this situation. At least I cannot. Best regards, Holger On Wed, Feb 12, 2014 at 12:15:07PM +0100, Gerardo Zegers R wrote: > Hi thanks for the help and sorry for not give more details. > > When i used the function SourceAtPos , the problem can compile without > problem but when I run the file It cant converge. > > The describing area is inside the grid and they are nodes inside because > dx=0.4 m and dy=0.4 m and iam using now a subarea of 1x1m to put the source > term. > > What can i do to get convergence? i have tried with differents timesteps. > > Thanks > > Gerardo > > > > 2014-02-12 9:19 GMT+01:00 Christoph Grüninger < > [email protected]>: > > > Hi Gerardo, > > "does not work" is kind of an useless problem description. What do you > > expect? What happens actually? > > > > Having a look into my crystal ball unveils the following hint: > > > > - Adding a std::cout to your function to proof that it is actually > > evaluated. > > - Your grid must match the conditions. It must be fine enough that some > > nodes are inside the described area and that this area is inside the > > grid. Please double check. Maybe a std::cout inside the first case would > > be helpful, too. > > - Have a look at the resulting linear system, especially the right hand > > side. Does your source term have an effect? > > > > Bye > > Christoph > > > > -- > > ... as Sir Cyril Hinshelwood has observed ...fluid dynamicists > > were divided into hydraulic engineers who observed things that > > could not be explained and mathematicians who explained things > > that could not be observed. -- James Lighthill > > ********************************************* > > CMWR 2014: 10th - 13th June 2014 in Stuttgart > > Please visit www.cmwr14.de > > ********************************************* > > _______________________________________________ > > Dumux mailing list > > [email protected] > > https://listserv.uni-stuttgart.de/mailman/listinfo/dumux > > > > > > -- > Gerardo Zegers R > 89850305 > _______________________________________________ > Dumux mailing list > [email protected] > https://listserv.uni-stuttgart.de/mailman/listinfo/dumux -- Holger Class ############################################################################### Lehrstuhl fuer Hydromechanik und Hydrosystemmodellierung (LH2) Institut für Wasser- und Umweltsystemmodellierung (IWS), Universitaet Stuttgart www.iws.uni-stuttgart.de/hydrosys email: [email protected] Pfaffenwaldring 61 ** 70550 Stuttgart Tel.: ++49 711 / 685-64678 Fax.: ++49 711 / 685-60430 ##################################Ecc#4,4###################################### _______________________________________________ Dumux mailing list [email protected] https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
