Update parset file with more explanations

problems/finite-strain-elasticity-bending.parset

@@ -6,12 +6,16 @@ structuredGrid = true
 
 # bounding box
 lower = 0 0 0
+
+# whole experiment: 45 mm x 10 mm x 2 mm, scaling with 10^7 such that the thickness, which is around 100 nm, so 100x10^-9 = 10^-7 is equal to 1.
+# upper = 45e4 10e4 2e4
+# using only a section of the whole experiment as deformed grid to start with for dune-gfe: use much smaller dimensions!
 upper = 200 100 200
 
 elements = 10 5 5
 
 # Number of grid levels: refinement levels of the surface shell part, refined using hierarchic refinement
-numLevels = 2
+numLevels = 1
 
 #Overlap indicator for the grid when doing parallel calculations; when set to false, all communication will be done assuming there is no overlap when assembling the matrix and the rhs
 overlap = false
@@ -63,33 +67,50 @@ baseTolerance = 1e-8
 #   Material parameters
 ############################
 
-energy = mooneyrivlin
+energy = mooneyrivlin # stvenantkirchhoff, neohooke, hencky, exphencky or mooneyrivlin
 
-## For the Wriggers L-shape example
 [materialParameters]
 
-# Lame parameters for stvenantkirchhoff
-# corresponds to E = 71240 N/mm^2, nu=0.31
-# However, we use units N/m^2
-mu = 2.7191e+4
-lambda = 4.4364e+4
-
-mooneyrivlin_a = 2.7191e+6
-mooneyrivlin_b = 2.7191e+6
-mooneyrivlin_c = 2.7191e+6 
-mooneyrivlin_10 = -7.28e+4
-mooneyrivlin_01 = 9.17e+4
-mooneyrivlin_20 = 1.23e+4
-mooneyrivlin_02 = 8.15e+4
-mooneyrivlin_11 = -5.14e+4
+## Lame parameters for stvenantkirchhoff, E = mu(3*lambda + 2*mu)/(lambda + mu)
+# mu = 2.7191e+4
+# lambda = 4.4364e+4
+
+#mooneyrivlin_a = 2.7191e+6
+#mooneyrivlin_b = 2.7191e+6
+#mooneyrivlin_c = 2.7191e+6
+
+#mooneyrivlin_10 = -7.28e+5 #182 20:1
+#mooneyrivlin_01 = 9.17e+5
+#mooneyrivlin_20 = 1.23e+5
+#mooneyrivlin_02 = 8.15e+5
+#mooneyrivlin_11 = -5.14e+5
+
+#mooneyrivlin_10 = -3.01e+6 #182 2:1
+#mooneyrivlin_01 = 3.36e+6
+#mooneyrivlin_20 = 5.03e+6
+#mooneyrivlin_02 = 13.1e+6
+#mooneyrivlin_11 = -15.2e+6
+
+mooneyrivlin_10 = -1.67e+6 #184 2:1
+mooneyrivlin_01 = 1.94e+6
+mooneyrivlin_20 = 2.42e+6
+mooneyrivlin_02 = 6.52e+6
+mooneyrivlin_11 = -7.34e+6
+
 mooneyrivlin_30 = 0
 mooneyrivlin_21 = 0
 mooneyrivlin_12 = 0
 mooneyrivlin_03 = 0
 
-mooneyrivlin_k = 1e+5	# volume-preserving parameter
+# volume-preserving parameter 
+mooneyrivlin_k = 55e+6	# 184 2:1, mooneyrivlin_k = 5e+7 and mooneyrivlin_energy = log, the neumannValues = 27e4 0 0 result in a stretch of 30% of 45e4 10e4 2e4 in x-direction, so a stretch of 45e4*0.3 = 13.5e4
+
 mooneyrivlin_energy = log # log, square or ciarlet; different ways to compute the Mooney-Rivlin-Energy
 
+# ciarlet: Fomula from "Ciarlet: Three-Dimensional Elasticity", here no penalty term is 
+# log: Generalized Rivlin model or polynomial hyperelastic model, using  0.5*mooneyrivlin_k*log(det(∇φ)) as the volume-preserving penalty term
+# square: Generalized Rivlin model or polynomial hyperelastic model, using mooneyrivlin_k*(det(∇φ)-1)² as the volume-preserving penalty term
+
 []
 
 #############################################
@@ -104,14 +125,14 @@ dirichletVerticesPredicate = "x[0] < 0.01"
 
 ###  Python predicate specifying all surface shell grid vertices
 # x is the vertex coordinate
-adaptiveRefinementPredicate = "x[2] > 199.99"
+adaptiveRefinementPredicate = "x[0] < 0.01"
 
-###  Python predicate specifying all Neumann grid vertices
+###  Python predicate specifying all neumannValues grid vertices
 # x is the vertex coordinate
-neumannVerticesPredicate = "x[0] > 199.99"
+neumannVerticesPredicate = "x[0] > 9.99"
 
-###  Neumann values, if needed
-neumannValues = 15e3 0 0
+###  Neumann values
+neumannValues = 27e4 0 0
 
 # Initial deformation
 initialDeformation = "x"