Point to discuss: how to name the executable and how to switch between the model?

How different are the two parameter files? Normally I would expect the switch in there as well.
In the name, we could somehow reflect that it is a solid mechanics solver. This would also be consistent on how we do things with other codes (OpenFOAM, FEniCS, Nutils). I think mentioning dealii as part of the name is not necessary. That should be clear. Can one switch of the coupling completely in the parameter file? Then precice or anything like "coupling" would neither be necessary in the name.

I also thought about it. There are some diffs, I guess it could be resolved.

diff linear_elasticity.prm nonlinear_elasticity.prm

17,19c17,21
<   # Time integration scheme
<   # 0 = forward, 1 = backward
<   set theta               = 0.5
---
>   # Newmark beta
>   set beta  = 0.25
> 
>   # Newmark gamma
>   set gamma   = 0.5
26,27c28,29
<   # mu (shear modulus)
<   set mu              = 1538462
---
>   # Poisson's ratio
>   set Poisson's ratio = 0.3
29,30c31,32
<   # lambda
<   set lambda          = 2307692
---
>   # Shear modulus
>   set Shear modulus   = 1538462
47a50,60
> end
> 
> subsection Nonlinear solver
>   # Number of Newton-Raphson iterations allowed
>   set Max iterations Newton-Raphson = 10
> 
>   # Displacement error tolerance
>   set Tolerance displacement        = 1.0e-6
> 
>   # Force residual tolerance
>   set Tolerance force               = 1.0e-9

Let's put the parameter handling in a separate PR, this one is already rather larger and it would allow to simplify the parameter code.

Regarding the name: what about fsi_solid ? or just solid?

Regarding the name: what about fsi_solid ? or just solid?

What about elasticity?

@davidscn told me this might be valuable input here:

I just tried running

~/tutorials/perpendicular-flap/solid-dealii$ ./run.sh -linear

It would be nice, if one could just provide a prefix instead of adding the executable to the path:

~/tutorials/perpendicular-flap/solid-dealii$ ./run.sh -linear -p /home/benjamin/dealii-adapter/linear_elasticity

My current (hacky) solution is:

~/tutorials/perpendicular-flap/solid-dealii$ git diff run.sh
diff --git a/perpendicular-flap/solid-dealii/run.sh b/perpendicular-flap/solid-dealii/run.sh
index 7eb9e4d..b3fd0f7 100755
--- a/perpendicular-flap/solid-dealii/run.sh
+++ b/perpendicular-flap/solid-dealii/run.sh
@@ -19,7 +19,7 @@ if [ "$1" = "-linear" ]; then
 fi

 if [ $linear -eq 1 ]; then
-        ./linear_elasticity linear_elasticity.prm
+        /home/benjamin/dealii-adapter/linear_elasticity/linear_elasticity linear_elasticity.prm
 elif [ $nonlinear -eq 1 ]; then
         ./nonlinear_elasticity nonlinear_elasticity.prm
 else

@BenjaminRodenberg I addressed your comment in precice/tutorials#166. You can now use the run.sh script with a prefix
-p=/.../ or --prefix=/mypath/. I will update the documentation accordingly.