Add an example case configuration

examples/precice-config.xml

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+<?xml version="1.0"?>
+<precice-configuration>
+  <log>
+    <sink
+      filter="%Severity% > debug and %Rank% = 0"
+      format="---[precice] %ColorizedSeverity% %Message%"
+      enabled="true" />
+  </log>
+
+  <solver-interface dimensions="3">
+    <data:vector name="Stress" />
+    <data:vector name="Displacement" />
+
+    <mesh name="Fluid-Mesh-Nodes">
+      <use-data name="Displacement" />
+    </mesh>
+
+    <mesh name="Fluid-Mesh-Faces">
+      <use-data name="Stress" />
+    </mesh>
+
+    <mesh name="Solid-write">
+      <use-data name="Displacement" />
+    </mesh>
+
+    <mesh name="Solid-read">
+      <use-data name="Stress" />
+    </mesh>
+
+    <participant name="Fluid">
+      <use-mesh name="Solid-write" from="Solid" />
+      <use-mesh name="Fluid-Mesh-Nodes" provide="yes" />
+      <use-mesh name="Fluid-Mesh-Faces" provide="yes" />
+      <write-data name="Stress" mesh="Fluid-Mesh-Faces" />
+      <read-data name="Displacement" mesh="Fluid-Mesh-Nodes" />
+      <mapping:nearest-neighbor
+        direction="read"
+        from="Solid-write"
+        to="Fluid-Mesh-Nodes"
+        constraint="consistent" />
+    </participant>
+
+    <participant name="Solid">
+      <use-mesh name="Solid-write" provide="yes" />
+      <use-mesh name="Solid-read" provide="yes" />
+      <use-mesh name="Fluid-Mesh-Faces" from="Fluid" />
+      <write-data name="Displacement" mesh="Solid-write" />
+      <read-data name="Stress" mesh="Solid-read" />
+      <mapping:nearest-neighbor
+        direction="read"
+        from="Fluid-Mesh-Faces"
+        to="Solid-read"
+        constraint="consistent" />
+    </participant>
+
+    <m2n:sockets from="Fluid" to="Solid" exchange-directory=".." />
+
+    <coupling-scheme:serial-implicit>
+      <participants first="Fluid" second="Solid" />
+      <max-time-windows value="10" />
+      <time-window-size value="1e-4" />
+      <exchange data="Stress" mesh="Fluid-Mesh-Faces" from="Fluid" to="Solid" />
+      <exchange data="Displacement" mesh="Solid-write" from="Solid" to="Fluid" />
+      <max-iterations value="50" />
+      <relative-convergence-measure limit="1e-3" data="Stress" mesh="Fluid-Mesh-Faces" />
+      <relative-convergence-measure limit="1e-3" data="Displacement" mesh="Solid-write" />
+      <acceleration:IQN-ILS>
+        <data name="Displacement" mesh="Solid-write" />
+        <preconditioner type="residual-sum" />
+        <filter type="QR2" limit="1e-3" />
+        <initial-relaxation value="0.1" />
+        <max-used-iterations value="10" />
+        <time-windows-reused value="15" />
+      </acceleration:IQN-ILS>
+    </coupling-scheme:serial-implicit>
+  </solver-interface>
+</precice-configuration>

examples/tube3d.prm

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+# Listing of Parameters
+# ---------------------
+subsection Finite element system
+  # Displacement system polynomial order
+  set Polynomial degree = 1
+
+  # Gauss quadrature order
+  set Quadrature order  = 2
+end
+
+subsection Output
+   # At which time to write a vtu output file
+   set Output tick     = 2e-4
+
+   # Output solution watchpoint
+   set Output solution = false
+
+   # Watchpoint in undeformed configuration to output unknown fields
+   set Output points   = 0.6, 0.2, 0
+
+   # Output folder
+   set Output folder   = dealii-output
+end
+
+
+subsection Geometry
+  # Dimension of the problem
+  set Dimension          = 3
+
+  # Number of global refinements
+  set Global refinement  = 3
+
+  # Testcase to compute
+  set Testcase           = tube3d
+end
+
+
+subsection Linear solver
+  # Linear solver residual (scaled by residual norm)
+  set Residual                  = 1e-6
+
+  # Linear solver iterations (multiples of the system matrix size)
+  set Max iteration multiplier  = 1
+
+  # Preconditioner type
+  set Preconditioner type        = gmg
+
+  # Preconditioner relaxation value
+  set Preconditioner relaxation  = 0.65
+
+  # Disable condition estimate
+  set Estimate condition number = false
+
+  # Number of CG iterations to estimate condition number
+  set Condition number CG iterations = 20
+
+  # Type of caching for matrix-free operator
+  set MF caching = scalar_referential
+
+  # Use Chebyshev smoother as coarse level solver
+  set MF Chebyshev coarse = true
+
+  # Accurately estimate eigenvalues for coarse level Chebyshev solver
+  set MF Chebyshev coarse accurate eigenvalues = true
+
+  # Number of CG iterations to estiamte condition number for Chebyshev smoother
+  set MF Chebyshev number CG iterations = 30
+end
+
+
+subsection Material properties
+  # Poisson's ratio
+  set Poisson's ratio = 0.3
+
+  # Shear modulus
+  set Shear modulus   = 3e5
+
+  # Formulation of the energy function
+  set Formulation     = 1
+
+  # Density
+  set Density       = 1200
+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
+
+  # Displacement update absolute tolerance
+  set Absolute tolerance displacement = 5e-15
+
+  # Force residual tolerance
+  set Tolerance force               = 1.0e-9
+
+  # Force residual absolute tolerance
+  set Absolute tolerance force = 2e-9
+end
+
+
+subsection Time
+  # End time
+  set End time       = 0.5 
+
+  # Time step size
+  set Time step size = 1e-4
+end
+
+subsection precice configuration
+  # Name of the precice configuration file
+  set precice config-file = ../precice-config.xml
+
+  # Name of the participant in the precice-config.xml file
+  set Participant name    = Solid
+
+  # Name of the coupling mesh in the precice-config.xml file
+  set Write mesh name     = Solid-write
+
+  # Name of the coupling mesh in the precice-config.xml file
+  set Read mesh name      = Solid-read
+
+  # Name of the read data in the precice-config.xml file
+  set Read data name      = Stress
+
+  # Name of the write data in the precice-config.xml file
+  set Write data name     = Displacement
+end