Dear deal.ii community! I stumbled over some interesting behavior of the heat equation from step-26. If I reduce the time step to a smaller value, let's say to 1e-6, I observe negative values for the solution near the sources (where gradients are large), which I would not expect. I guess it is related to the sharpness of the used right hand side function, since I could not observe this behavior with a smooth Gaussian shaped one. So my idea was then that DG methods may suppress this behavior. How are your thoughts about that?
I stumbled over this issue while working on buoyancy-driven flows. It causes negative temperature differences in my setup, yielding downward buoyancy forces which ruin the whole dynamic of the fluid in the end. I would be grateful for any comment on that! Best, Marc -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
