"You record constraints in an AffineConstraints object, and that continues to be the work in parallel as well"
Thanks a lot, Prof. Bangerth. I may misunderstand the error messages. I will try to debug on other parts and keep this topic updated. Best, Lex On Wednesday, September 13, 2023 at 10:58:12 PM UTC-7 Wolfgang Bangerth wrote: > > Lex: > > > I developed my FSI code based on the FENothing framework used in > step-46. > > Step-46 shows how to identify the interface between the fluid and solid > > domain. Also it shows how to set constraints on variables and how to > assemble > > terms on the interface. I just used the same logic in my FSI code. > > > > In step-46, the interface handling part gets access to the cells, > > cell->neighbours, neighbour of neighbour and global index of the face > grids on > > the interface. However, things are much different and difficult in > parallel > > mode, as a cell is locally owned but its neighbour may be not (ghost > cells). > > In a ghost cell, values are only readable. Therefore, it seems > impossible to > > set constraints / write values on index of neighbour cells. > > No, that is not true. You record constraints in an AffineConstraints > object, > and that continues to be the work in parallel as well -- see step-40, for > example. > > > > I have tried many ways to fix this problem but failed. Do you guys have > the > > similiar experience on this problem? If yes, how to fix it? Any > suggestion? > You need to be specific about how you tried to fix the problem, and what > the > error message (or other way of failure) is. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/4b58b234-b7bf-418c-9006-fbc4f1e7d4c5n%40googlegroups.com.
