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.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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