Thank you very much for the detailed answer. I would look into the links in more depth.
Best, Dimitar Stanev On Tuesday, January 30, 2018 at 12:25:21 AM UTC+2, Wolfgang Bangerth wrote: > > > Jim (?), > > > I am in the process of choosing an open-source FE library to model the > > knee complex (femur, tibia, meniscus and cartilages). I have been using > > FEBio GUI tools which specialize in modeling rigid and deformable > > interactions but I was not very satisfied with the API and the available > > documentation. I would like to know if I would be able to model the > > following features with dealii: > > > > 1) interaction between femur bone (model as rigid body) and femoral > > cartilage (model as deformable) to reduce the degrees of freedom of the > > model > > If the bone really is rigid, then it is probably easiest to not model it > via the finite element method by meshing it, but by just describing it > via its 6 degrees of freedom (3 positions plus 3 rotations). This would > mean that you'd only describe the deformable part of the domain through > the finite element method, with boundary conditions imposed based on the > state of the bone. The bone's state would then be updated based on the > forces exerted by the cartilage. > > This would be a bit non-standard, but I don't see a fundamental > difficulty to this. > > > > 2) prescribed orientation, position and body forces for rigid bodies as > > initial conditions > > Yes. > > > > 3) study contract and pressure between deformables (e.g. collision > > between cartilage and meniscus) > > This is a modeling question for which it is important to know what > mathematical formulation you use. People have described contact problems > in deal.II, and there is a tutorial program (step-42) that shows a > problem where one body is impacted by a rigid other body. In your case, > you'd have to develop a method to deal with two deformable bodies. That, > too, has been done, but it's clearly more work (both mathematically as > well as implementation wise). > > > > Do you know of any examples or projects that have used dealii for > > similar problems (in biomechanics)? > > In addition to step-42, you may want to go through the list of code > gallery programs here: > https://dealii.org/developer/doxygen/deal.II/CodeGallery.html > > There are also many projects of which we don't have the code but where > the author may be willing to share what they had done. I would take a > look at the publications that have used deal.II: > http://dealii.org/publications.html > > Best > W. > > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > <javascript:> > www: http://www.math.colostate.edu/~bangerth/ > -- 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.
