Update multiple-perpendicular-flaps picture and documentation (precice#511)

Author: MakisH

multiple-perpendicular-flaps/README.md

@@ -107,6 +107,8 @@ The scenario settings are implemented similarly for the nonlinear case.
 
 After the simulation has finished, you can visualize your results using e.g. ParaView. Fluid results are in the OpenFOAM format and you may load the `fluid-openfoam.foam` file. Looking at the fluid results is enough to obtain information about the behaviour of the flaps. You can also visualize the solid participants' vtks though.
 
+Example visualization of the fluid velocity and the solid displacement at t=2.3s, after synchronizing the results with a `Temporal Shift Scale` filter (scale for the deal.II results: 0.1):
+
 ![Example visualization](images/tutorials-multiple-perpendicular-flaps-results.png)
 
 ## References

multiple-perpendicular-flaps/images/tutorials-multiple-perpendicular-flaps-results.png

@@ -2,7 +2,7 @@
 # Run this script at the root of the repository to check the size of images
 
 CODE=0
-MAXIMUMSIZE=250
+MAXIMUMSIZE=750
 MAXIMUMGIFSIZE=2200
 
 RED='\033[0;31m'