Hi Thomas, Thanks for you answer. I guess I was nit clear enough. what weI want to do is much simpler. Maybe I can explain the experimental setup and put dumux in context in doing so:
We have an experiment where we investigate boiling of fluid mixtures and associated heat transfer [ critical flux and "heat pipe effect"] in sand in a closed vessel. Mass is conserved[ no flux in or out of the vessel] The heat source is the bottom plate of the box, electrically heated.[ this is the Neuman boundary condition on the energy equation I was searching an example of.it is quite simple just an operator controlled heat flux..] The other wall of the box are held at constant [cold] temperature [Dirichlet] with water jacket. Initial pressure is atmospheric and then evolve with time.. The natural convection pattern can be quite complex because we have 2 (mostly immiscible) fluids mixed with slightly different boiling points. we have a lot of thermocouple in the sands and we would like to try to capture heat transfer and natural convection pattern with the help of numerical computation.. here comes dumux. Because of the nature of the mixtures, we need a computational tool where we will be able to tweak the fluid systems and change them as required. Before we can do that we need to learn how to use dumux first [ this is where we are at the moment-just starting ] and build a case corresponding to our experimental setup. Sorry for the details but at least you have an idea of the kind of problems we are interested in.and why we are going to invest significant amount of time with dumux going forward.. Jean-Francois ________________________________________ De : Thomas Fetzer [[email protected]] Envoyé : mercredi 26 novembre 2014 16:11 À : [email protected]; LEON Jean-Francois Objet : Re: [DuMuX] Example or test of neumann BC on the energy equation ( ni) Hi Jean-Francois, welcome to DuMuX . If I understood you correctly, you want to have a (solution dependent) Neumann boundary condition? Or what do you mean by "couple at the boundary of the domain"? You can have a look to test/implicit/1p2c/1p2cconvectionproblem.hh there a solution dependent heat flux is set in the solDependentNeumann() function. I hope this helps, best regards, Thomas %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Dipl. Ing. Thomas Fetzer Institut für Wasser- und Umweltsystemmodellierung (IWS) Lehrstuhl für Hydromechanik und Hydrosystemmodellierung Universität Stuttgart, Pfaffenwaldring 61, 70569 Stuttgart Email: [email protected] Telefon: 0049-711-685-60103 ** fax: 0049-711-685-60430 http://www.hydrosys.uni-stuttgart.de %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Am 11/26/2014 um 02:31 PM schrieb [email protected]: > Hi there, > This is my first post as I am a new user of dumux. > I am currently going through the test folder to get acquainted with this > environment > > One thing I would like to use in my research going forward is the ability to > couple a heat flux at the boundary of the domain. > > I cannot find any test or example of this feature. > Did I miss something? > > if somebody has used it is it possible to have some feedback? > I am not a pro in c++. I[ know enough to be an "enlightned user" but not a > code. So having an example or a test as a starting point will be of great > help to me. > > Thanks ! > > JF Leon > _______________________________________________ > Dumux mailing list > [email protected] > https://listserv.uni-stuttgart.de/mailman/listinfo/dumux > _______________________________________________ Dumux mailing list [email protected] https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
