Hi everybody I am trying to model the propagation of a free surface based on an Pseudo-concentration approach. In this way I need to solve the Stokes equations in the whole domain for every time step, the properties of the fluid are determined depending on the value of the saturation/pseudo-concentration function. My first question deals with the reinitialization of this function to avoid distortion of the propagating front. I need to be able to get the value of the saturation variable on a mesh node plus the value of the satuartion for the surrounding nodes; namely the patch of elements centered (I am using a grid aligned with the global axis) at the given node and the position of these nodes so that I can compute the distance from the assumed contour where the free surface is located. So is there a functionality in deal.II to do that?If not has anyone a suggestion of how I can do that? The second question deals with the implementation of the boundary conditions on solid boundaries. In general I need to be able to impose full vanishing velocity vector only when the pseudo concentration at this point indicates full saturation and apply free traction when the saturation indicates the presence of pseudo-fluid. Does anyone have any suggestion how can I do that?Obviously these boundary conditions need to be adjusted with respect to time somehow. Thanks in advance and all the best Alex
PS:It would have been good if I could solve only on the saturated domain since this would save plenty of computation time can this be implemented in deal.II?To start with, I am guessing that either a global matrix needs to be assembled at every time step which I am guessing that would imply dynamically adapted global matrix or an ability to extract only the relevant dofs from the once generated global matrix and solve only for these dofs. But how these will constitute a well posed problem? This message has been checked for viruses but the contents of an attachment may still contain software viruses, which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation. This message has been checked for viruses but the contents of an attachment may still contain software viruses which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation. _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
