Thank you Wolfgang Bangerth for the advice! It struck me however, please correct me if I am wrong, that since we working with global shape function (fe), the integration (fe(old),fe(new))_new domain is merely loop over all cells and its simple provide to fe(old) the new domains quadrature points!
But here comes the obstacle: if the quadrature point for new domain is outside the domain for the old, does it automatically give zero for fe(old)(new quadrature) or i must do a GridTool->is_within check? Further, for large deformations one should simply drop the overlap functions, the part i am interested is the inertia force preventing immediate reaction to the fluid, so then i could actually have a if check, doing a quasistatic calculation then ask after, is the deformation to large? At that point i choose either step-23, or step-28, or my version for large deformations, drop the overlap terms. Best Regards Johan > >> If the grid is the same between the timesteps, everything is alike >> step-23, easy task, but now using different grid, i am thinking of using >> Roths method, following the step-23, but the overlap between fe from >> different grid, is an obstacle i cannot pass due to the documentation of >> step-28 is a bit unclear for me. > > The correct thing to do is, as you suggest, compute the right hand terms > by > multiplying the solution on the old grid with test functions on the new > grid. > That's awkward to implement though, as step-28 shows. > > The alternative is to not change the grid very often, and then simply > transfer > the previous solution from the old grid to the new grid, pretending it had > been defined on the new grid all along. This is what step-31 does, for > example (you'll have to look at the most recent svn version), and what > step-33 does all along. Take a look there! > > Cheers > W. > > ------------------------------------------------------------------------- > Wolfgang Bangerth email: [EMAIL PROTECTED] > www: http://www.math.tamu.edu/~bangerth/ > > _______________________________________________
