From 99cd534d8bcbc8cddaa0e86cf9c672b0698e216b Mon Sep 17 00:00:00 2001
From: Lars Bilke <lars.bilke@ufz.de>
Date: Fri, 27 Nov 2020 14:13:39 +0100
Subject: [PATCH] [web] Added video tutorial by Dominik and Christian.
---
.../video-tutorial/OGSinput_basin.prj | 212 +
.../video-tutorial/glacierclass.py | 70 +
.../getting-started/video-tutorial/history.sh | 11 +
.../getting-started/video-tutorial/index.md | 48 +
.../video-tutorial/mesh_basin.msh | 5648 +++++++++++++++++
.../video-tutorial/mesh_basin.py | 226 +
.../video-tutorial/timeBCs_glacier.py | 35 +
7 files changed, 6250 insertions(+)
create mode 100644 web/content/docs/tools/getting-started/video-tutorial/OGSinput_basin.prj
create mode 100644 web/content/docs/tools/getting-started/video-tutorial/glacierclass.py
create mode 100644 web/content/docs/tools/getting-started/video-tutorial/history.sh
create mode 100644 web/content/docs/tools/getting-started/video-tutorial/index.md
create mode 100644 web/content/docs/tools/getting-started/video-tutorial/mesh_basin.msh
create mode 100644 web/content/docs/tools/getting-started/video-tutorial/mesh_basin.py
create mode 100644 web/content/docs/tools/getting-started/video-tutorial/timeBCs_glacier.py
diff --git a/web/content/docs/tools/getting-started/video-tutorial/OGSinput_basin.prj b/web/content/docs/tools/getting-started/video-tutorial/OGSinput_basin.prj
new file mode 100644
index 00000000000..93f41a2f44c
--- /dev/null
+++ b/web/content/docs/tools/getting-started/video-tutorial/OGSinput_basin.prj
@@ -0,0 +1,212 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
+<OpenGeoSysProject>
+ <meshes>
+ <mesh>mesh_basin_domain.vtu</mesh>
+ <mesh>mesh_basin_physical_group_Left.vtu</mesh>
+ <mesh>mesh_basin_physical_group_Right.vtu</mesh>
+ <mesh>mesh_basin_physical_group_Bottom.vtu</mesh>
+ <mesh>mesh_basin_physical_group_Top.vtu</mesh>
+ </meshes>
+ <python_script>timeBCs_glacier.py</python_script>
+ <processes>
+ <process>
+ <name>SD</name>
+ <type>SMALL_DEFORMATION</type>
+ <!--define the numerical integration order -->
+ <!--(polynomial degree to which exact integration is possible) -->
+ <integration_order>2</integration_order>
+ <!--define the constitutive behavior with regard to the MaterialID -->
+ <constitutive_relation id="0">
+ <!-- soft sediment layer -->
+ <type>LinearElasticIsotropic</type>
+ <youngs_modulus>YoungModulus</youngs_modulus>
+ <poissons_ratio>PoissonRatio</poissons_ratio>
+ </constitutive_relation>
+ <constitutive_relation id="1">
+ <!-- stiff sediment layer -->
+ <type>LinearElasticIsotropic</type>
+ <youngs_modulus>YoungModulus</youngs_modulus>
+ <poissons_ratio>PoissonRatio</poissons_ratio>
+ </constitutive_relation>
+ <constitutive_relation id="2">
+ <!-- soft sediment layer -->
+ <type>LinearElasticIsotropic</type>
+ <youngs_modulus>YoungModulus</youngs_modulus>
+ <poissons_ratio>PoissonRatio</poissons_ratio>
+ </constitutive_relation>
+ <constitutive_relation id="3">
+ <!-- very stiff rock bed -->
+ <type>LinearElasticIsotropic</type>
+ <youngs_modulus>YoungModulus</youngs_modulus>
+ <poissons_ratio>PoissonRatio</poissons_ratio>
+ </constitutive_relation>
+ <solid_density>rho_sr</solid_density>
+ <specific_body_force>0 -9.81</specific_body_force>
+ <process_variables>
+ <process_variable>displacement</process_variable>
+ </process_variables>
+ <!--define the output quantities derived from the primary variables-->
+ <secondary_variables>
+ <secondary_variable internal_name="sigma" output_name="sigma"/>
+ <secondary_variable internal_name="epsilon" output_name="epsilon"/>
+ </secondary_variables>
+ </process>
+ </processes>
+ <time_loop>
+ <processes>
+ <process ref="SD">
+ <nonlinear_solver>basic_newton</nonlinear_solver>
+ <convergence_criterion>
+ <type>DeltaX</type>
+ <norm_type>INFINITY_N</norm_type>
+ <abstol>1e-14</abstol>
+ </convergence_criterion>
+ <time_discretization>
+ <type>BackwardEuler</type>
+ </time_discretization>
+ <time_stepping>
+ <type>FixedTimeStepping</type>
+ <t_initial>0</t_initial>
+ <t_end>1</t_end>
+ <!-- purely elastic problem: time scale irrelevant -->
+ <timesteps>
+ <pair>
+ <repeat>100</repeat>
+ <delta_t>0.01</delta_t>
+ <!-- i.e.: repeat a hundred times a time step with size of delta_t -->
+ </pair>
+ </timesteps>
+ </time_stepping>
+ </process>
+ </processes>
+ <output>
+ <type>VTK</type>
+ <prefix>OGSoutput_basin{:process_id}</prefix>
+ <timesteps>
+ <pair>
+ <repeat>100</repeat>
+ <each_steps>1</each_steps>
+ <!-- i.e.: do a hundred times the output at each step -->
+ </pair>
+ </timesteps>
+ <variables>
+ <variable>displacement</variable>
+ <variable>sigma</variable>
+ </variables>
+ <suffix>_ts_{:timestep}_t_{:time}</suffix>
+ </output>
+ </time_loop>
+ <parameters>
+ <!-- Material parameters -->
+ <parameter>
+ <name>YoungModulus</name>
+ <type>Group</type>
+ <group_id_property>MaterialIDs</group_id_property>
+ <index_values>
+ <index>0</index>
+ <value>60e6</value> <!--Pa-->
+ </index_values>
+ <index_values>
+ <index>1</index>
+ <value>60e7</value> <!--Pa-->
+ </index_values>
+ <index_values>
+ <index>2</index>
+ <value>60e6</value> <!--Pa-->
+ </index_values>
+ <index_values>
+ <index>3</index>
+ <value>60e9</value> <!--Pa-->
+ </index_values>
+ </parameter>
+ <parameter>
+ <name>PoissonRatio</name>
+ <type>Group</type>
+ <group_id_property>MaterialIDs</group_id_property>
+ <index_values>
+ <index>0</index>
+ <value>0.25</value>
+ </index_values>
+ <index_values>
+ <index>1</index>
+ <value>0.25</value>
+ </index_values>
+ <index_values>
+ <index>2</index>
+ <value>0.25</value>
+ </index_values>
+ <index_values>
+ <index>3</index>
+ <value>0.45</value>
+ </index_values>
+ </parameter>
+ <parameter>
+ <name>rho_sr</name>
+ <type>Constant</type>
+ <value>1</value>
+ </parameter>
+ <!-- Initial and boundary values -->
+ <parameter>
+ <name>displacement0</name>
+ <type>Constant</type>
+ <values>0 0</values>
+ </parameter>
+ <parameter>
+ <name>dirichlet0</name>
+ <type>Constant</type>
+ <value>0</value>
+ </parameter>
+ </parameters>
+ <process_variables>
+ <process_variable>
+ <name>displacement</name>
+ <components>2</components>
+ <order>1</order>
+ <initial_condition>displacement0</initial_condition>
+ <boundary_conditions>
+ <boundary_condition>
+ <mesh>mesh_basin_physical_group_Left</mesh>
+ <type>Dirichlet</type>
+ <component>0</component>
+ <parameter>dirichlet0</parameter>
+ </boundary_condition>
+ <boundary_condition>
+ <mesh>mesh_basin_physical_group_Right</mesh>
+ <type>Dirichlet</type>
+ <component>0</component>
+ <parameter>dirichlet0</parameter>
+ </boundary_condition>
+ <boundary_condition>
+ <mesh>mesh_basin_physical_group_Top</mesh>
+ <type>Python</type>
+ <component>1</component>
+ <bc_object>bc_y</bc_object> <!--the python object is created using timeBCs_glacier.py (see L. 10)-->
+ <flush_stdout>true</flush_stdout> <!-- for debugging: false -->
+ </boundary_condition>
+ <boundary_condition>
+ <mesh>mesh_basin_physical_group_Bottom</mesh>
+ <type>Dirichlet</type>
+ <component>1</component>
+ <parameter>dirichlet0</parameter>
+ </boundary_condition>
+ </boundary_conditions>
+ </process_variable>
+ </process_variables>
+ <nonlinear_solvers>
+ <nonlinear_solver>
+ <name>basic_newton</name>
+ <type>Newton</type>
+ <max_iter>20</max_iter>
+ <linear_solver>general_linear_solver</linear_solver>
+ </nonlinear_solver>
+ </nonlinear_solvers>
+ <linear_solvers>
+ <linear_solver>
+ <name>general_linear_solver</name>
+ <eigen>
+ <solver_type>SparseLU</solver_type>
+ <scaling>true</scaling>
+ </eigen>
+ </linear_solver>
+ </linear_solvers>
+</OpenGeoSysProject>
diff --git a/web/content/docs/tools/getting-started/video-tutorial/glacierclass.py b/web/content/docs/tools/getting-started/video-tutorial/glacierclass.py
new file mode 100644
index 00000000000..7c8ed26747f
--- /dev/null
+++ b/web/content/docs/tools/getting-started/video-tutorial/glacierclass.py
@@ -0,0 +1,70 @@
+# model of the evolving glacier extensions (length and height)
+# parameterized, independent of concrete geometry
+
+import numpy as np
+import matplotlib.pyplot as plt
+
+from math import pi, sin, cos, sinh, cosh, sqrt
+
+gravity = 9.81 # m/s²
+
+
+class glacier:
+ def __init__(self, L_dom, L_max, H_max, x_0, t_0, t_1):
+ self.rho_ice = 900 # kg/m³
+ self.L_dom = L_dom
+ self.L_max = L_max
+ self.H_max = H_max
+ self.x_0 = x_0
+ self.t_0 = t_0
+ self.t_1 = t_1
+
+ def normalstress(self, x, t):
+ return -self.rho_ice * gravity * self.local_height(x, t)
+
+ # analytical function for the glacier's shape
+ def local_height(self, x, t):
+ l = self.length(t)
+ if l == 0:
+ return 0 * x
+ else:
+ xi = (x - self.x_0) / l
+ xi = np.array(xi)
+ xi[xi > 1] = 1.0
+ return self.height(t) * np.sqrt(1 - xi ** 1)
+
+ def height(self, t):
+ return self.H_max * (t - self.t_0) / self.t_1
+
+ def length(self, t):
+ return self.L_max * (t - self.t_0) / self.t_1
+
+ def printMaxLoads(self):
+ print("Maximal normal stress due to glacier load: ")
+ print(self.normalstress(0, self.t_1) / 1e6, "MPa")
+
+ def plotEvolution(self):
+ tRange = np.linspace(self.t_0, self.t_1, 11)
+ xRange = np.linspace(self.x_0, self.x_0 + self.L_dom, 500)
+ yRangeBefore = 0
+
+ fig, ax = plt.subplots()
+ ax.set_title("Glacier evolution")
+ for t in tRange:
+ yRange = self.local_height(xRange, t)
+ ax.plot(xRange, yRange, label=t)
+ ax.fill_between(xRange, yRangeBefore, yRange)
+ yRangeBefore = yRange
+ ax.set_xlabel("$x$ / m")
+ ax.set_ylabel("height")
+ ax.grid()
+ fig.legend()
+ fig.savefig("glacier.pdf")
+
+ plt.show()
+
+ fig, ax = plt.subplots()
+ ax.plot(tRange, self.height(tRange))
+ ax.set_xlabel("$t$ / a")
+ ax.set_ylabel("height")
+ ax.grid()
diff --git a/web/content/docs/tools/getting-started/video-tutorial/history.sh b/web/content/docs/tools/getting-started/video-tutorial/history.sh
new file mode 100644
index 00000000000..5fb0852997e
--- /dev/null
+++ b/web/content/docs/tools/getting-started/video-tutorial/history.sh
@@ -0,0 +1,11 @@
+#create the mesh via python control for gmsh
+python3 mesh_basin.py
+
+#transform the mesh and extract boundary meshes
+python3 msh2vtu.py mesh_basin.msh --ogs --rdcd
+
+#run OpenGeoSys (with the debug level information)
+ogsr -l debug OGSinput_basin.prj
+
+#do the postprocessing with ParaView
+paraview OGSoutput_basin0.pvd
diff --git a/web/content/docs/tools/getting-started/video-tutorial/index.md b/web/content/docs/tools/getting-started/video-tutorial/index.md
new file mode 100644
index 00000000000..1d9ee59573d
--- /dev/null
+++ b/web/content/docs/tools/getting-started/video-tutorial/index.md
@@ -0,0 +1,48 @@
++++
+date = "2018-02-27T11:00:13+01:00"
+title = "Video Tutorial"
+author = "Dominik Kern"
+weight = 105
+
+[menu.docs]
+name = "Tools & Workflows"
+identifier = "tools"
+weight = 4
+post = "Helpful tools for pre- and postprocessing as well as complete model setup workflows."
+
+[menu.tools]
+parent = "getting-started"
++++
+
+In this [three-part tutorial](https://www.youtube.com/watch?v=BULunRJQRJ0&list=PLU_clTnZqNAeOXENl79kQwn0pgHGittX1) we look at the mechanical deformation of a sedimentary basin under an advancing glacier. In detail we show you a possibility how to
+
+* create a mesh with [Gmsh](http://gmsh.info/),
+* implement space- and time-dependent boundary conditions,
+* write an OGS input file,
+* visualize the results with [ParaView](https://www.paraview.org/).
+
+As a common programming language we use [Python](https://www.python.org).
+
+## Part 1: Preprocessing
+
+{{< youtube BULunRJQRJ0 >}}
+
+## Part 2: Solving
+
+{{< youtube GL5sugIyHEk >}}
+
+## Part 3: Postprocessing
+
+{{< youtube bkmubABAA_s >}}
+
+
+## Supplementary material:
+
+* [mesh_basin.msh](mesh_basin.msh)
+* [mesh_basin.py](mesh_basin.py)
+* [OGSinput_basin.prj](OGSinput_basin.prj)
+* [timeBCs_glacier.py](timeBCs_glacier.py)
+* [glacierclass.py](glacierclass.py)
+* [history.sh](history.sh)
+* [msh2vtu-project on GitHub](https://github.com/dominik-kern/msh2vtu)
+* *Transient hydrodynamics within intercratonic sedimentary basins during glacial cycles*, V. F. Bense M. A. Person, DOI: [10.1029/2007JF000969](https://doi.org/10.1029/2007JF000969)
diff --git a/web/content/docs/tools/getting-started/video-tutorial/mesh_basin.msh b/web/content/docs/tools/getting-started/video-tutorial/mesh_basin.msh
new file mode 100644
index 00000000000..be63768f727
--- /dev/null
+++ b/web/content/docs/tools/getting-started/video-tutorial/mesh_basin.msh
@@ -0,0 +1,5648 @@
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+1 2 "Bottom"
+1 3 "Right"
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diff --git a/web/content/docs/tools/getting-started/video-tutorial/mesh_basin.py b/web/content/docs/tools/getting-started/video-tutorial/mesh_basin.py
new file mode 100644
index 00000000000..5f26e12b5d4
--- /dev/null
+++ b/web/content/docs/tools/getting-started/video-tutorial/mesh_basin.py
@@ -0,0 +1,226 @@
+# ------------------------------------------------------------------------------
+#
+# Gmsh Python tutorial for meshing a layered sediment basin stratigraphy
+#
+# Geometry basics, elementary entities, physical groups
+#
+# ------------------------------------------------------------------------------
+
+# The Python API is entirely defined in the `gmsh.py' module (which contains the
+# full documentation of all the functions in the API):
+import numpy
+import gmsh
+
+# Before using any functions in the Python API, Gmsh must be initialized:
+gmsh.initialize()
+
+# By default Gmsh will not print out any messages: in order to output messages
+# on the terminal, just set the "General.Terminal" option to 1:
+gmsh.option.setNumber("General.Terminal", 1)
+
+# Next we add a new model named "t1" (if gmsh.model.add() is not called a new
+# unnamed model will be created on the fly, if necessary):
+gmsh.model.add("basinMesh")
+
+# The Python API provides direct access to each supported geometry kernel. The
+# built-in kernel is used in this first tutorial: the corresponding API
+# functions have the `gmsh.model.geo' prefix.
+
+# The first type of `elementary entity' in Gmsh is a `Point'. To create a point
+# with the built-in geometry kernel, the Python API function is
+# gmsh.model.geo.addPoint():
+# - the first 3 arguments are the point coordinates (x, y, z)
+# - the next (optional) argument is the target mesh size (the "characteristic
+# length") close to the point
+# - the last (optional) argument is the point tag (a stricly positive integer
+# that uniquely identifies the point)
+
+# The distribution of the mesh element sizes will be obtained by interpolation
+# of these characteristic lengths throughout the geometry. Another method to
+# specify characteristic lengths is to use general mesh size Fields (see
+# `t10.py'). A particular case is the use of a background mesh (see `t7.py').
+#
+# If no target mesh size of provided, a default uniform coarse size will be used
+# for the model, based on the overall model size.
+
+# Units: meter
+km = 1e3 # km in m
+w = 120 * km # width
+d = 7.5 * km # depth
+lc = 1e3 # m
+
+# We can then define some additional points. All points should have different tags:
+
+gmsh.model.geo.addPoint(w / 2, 0, 0, lc, 1)
+gmsh.model.geo.addPoint(-w / 2, 0, 0, lc, 2)
+gmsh.model.geo.addPoint(-w / 2, -d, 0, lc, 3)
+gmsh.model.geo.addPoint(w / 2, -d, 0, lc, 4)
+
+# If the tag is not provided explicitly, a new tag is automatically created, and
+# returned by the function:
+
+pLay1centr = gmsh.model.geo.addPoint(0, -d / 6, 0, lc)
+pLay2centr = gmsh.model.geo.addPoint(0, -d / 3, 0, lc)
+pLay3centr = gmsh.model.geo.addPoint(0, -d / 2, 0, lc)
+
+# Auxiliary points for the sediment layers
+pLay1north = gmsh.model.geo.addPoint(-w / 8, 0, 0, lc)
+pLay1south = gmsh.model.geo.addPoint(w / 8, 0, 0, lc)
+
+pLay2north = gmsh.model.geo.addPoint(-w / 6, 0, 0, lc)
+pLay2south = gmsh.model.geo.addPoint(w / 6, 0, 0, lc)
+
+pLay3north = gmsh.model.geo.addPoint(-w / 4, 0, 0, lc)
+pLay3south = gmsh.model.geo.addPoint(w / 4, 0, 0, lc)
+
+# Curves are Gmsh's second type of elementery entities, and, amongst curves,
+# straight lines are the simplest. The API to create straight line segments with
+# the built-in kernel follows the same conventions: the first 2 arguments are
+# point tags (the start and end points of the line), and the last (optional one)
+# is the line tag.
+#
+# Note that curve tags are separate from point tags - hence we can reuse tag `1'
+# for our first curve. And as a general rule, elementary entity tags in Gmsh
+# have to be unique per geometrical dimension.
+# gmsh.model.geo.addLine(1, 2, 1) # (start, end, tag)
+gmsh.model.geo.addLine(2, 3, 2)
+gmsh.model.geo.addLine(3, 4, 3)
+gmsh.model.geo.addLine(4, 1, 4)
+
+gmsh.model.geo.addLine(pLay3south, pLay2south, 5)
+gmsh.model.geo.addLine(pLay2south, pLay1south, 6)
+gmsh.model.geo.addLine(pLay1south, pLay1north, 7)
+gmsh.model.geo.addLine(pLay1north, pLay2north, 8)
+gmsh.model.geo.addLine(pLay2north, pLay3north, 9)
+gmsh.model.geo.addLine(1, pLay3south, 10)
+gmsh.model.geo.addLine(pLay3north, 2, 14)
+
+gmsh.model.geo.addSpline([pLay1south, pLay1centr, pLay1north], 11)
+gmsh.model.geo.addSpline([pLay2south, pLay2centr, pLay2north], 12)
+gmsh.model.geo.addSpline([pLay3south, pLay3centr, pLay3north], 13)
+
+# The third elementary entity is the surface. In order to define a surface
+# from the curves defined above, a curve loop has first to be defined.
+# A curve loop is defined by an ordered list of connected curves,
+# a sign being associated with each curve (depending on the orientation of the
+# curve to form a loop). The API function to create curve loops takes a list
+# of integers as first argument, and the curve loop tag (which must be unique
+# amongst curve loops) as the second (optional) argument:
+# e.g. gmsh.model.geo.addCurveLoop([4, 1, 2, 3], 1)
+
+gmsh.model.geo.addCurveLoop([7, -11], 1)
+gmsh.model.geo.addCurveLoop([6, 11, 8, -12], 2)
+gmsh.model.geo.addCurveLoop([5, 12, 9, -13], 3)
+gmsh.model.geo.addCurveLoop([2, 3, 4, 10, 13, 14], 4)
+
+# Add plane surfaces defined by one or more curve loops. The first curve
+# loop defines the exterior contour; additional curve loop define holes.
+# (only one here, representing the external contour, since there are no holes
+# --see `t4.py' for an example of a surface with a hole):
+for l in range(1, 5):
+ gmsh.model.geo.addPlaneSurface([l], l)
+
+# At this level, Gmsh knows everything to display the surfaces and
+# to mesh it. An optional step is needed if we want to group elementary
+# geometrical entities into more meaningful groups, e.g. to define some
+# mathematical ("domain", "boundary"), functional ("left wing", "fuselage") or
+# material ("steel", "carbon") properties.
+#
+# Such groups are called "Physical Groups" in Gmsh. By default, if physical
+# groups are defined, Gmsh will export in output files only mesh elements that
+# belong to at least one physical group. (To force Gmsh to save all elements,
+# whether they belong to physical groups or not, set the `Mesh.SaveAll' option
+# to 1.) Physical groups are also identified by tags, i.e. stricly positive
+# integers, that should be unique per dimension (0D, 1D, 2D or 3D). Physical
+# groups can also be given names.
+#
+# Here we define physical curves that groups the left, bottom, top and right
+# curves in single groups for the one-dimensional boundary meshes
+dim = 1
+North = gmsh.model.addPhysicalGroup(dim, [2])
+gmsh.model.setPhysicalName(dim, North, "Left")
+
+Base = gmsh.model.addPhysicalGroup(dim, [3])
+gmsh.model.setPhysicalName(dim, Base, "Bottom")
+
+South = gmsh.model.addPhysicalGroup(dim, [4])
+gmsh.model.setPhysicalName(dim, South, "Right")
+
+Ground = gmsh.model.addPhysicalGroup(dim, [10, 5, 6, 7, 8, 9, 14])
+gmsh.model.setPhysicalName(dim, Ground, "Top")
+
+# ... and we define physical surfaces for the different
+# material domains containing the corresponding geometrical surfaces:
+dim = 2
+Lay1 = gmsh.model.addPhysicalGroup(dim, [1])
+gmsh.model.setPhysicalName(dim, Lay1, "SedimentLayer1")
+Lay2 = gmsh.model.addPhysicalGroup(dim, [2])
+gmsh.model.setPhysicalName(dim, Lay2, "SedimentLayer2")
+Lay3 = gmsh.model.addPhysicalGroup(dim, [3])
+gmsh.model.setPhysicalName(dim, Lay3, "SedimentLayer3")
+Bed = gmsh.model.addPhysicalGroup(dim, [4])
+gmsh.model.setPhysicalName(dim, Bed, "RockBed")
+
+# Before it can be meshed, the internal CAD representation must be synchronized
+# with the Gmsh model, which will create the relevant Gmsh data structures. This
+# is achieved by the gmsh.model.geo.synchronize() API call for the built-in
+# geometry kernel. Synchronizations can be called at any time, but they involve
+# a non trivial amount of processing; so while you could synchronize the
+# internal CAD data after every CAD command, it is usually better to minimize
+# the number of synchronization points.
+gmsh.model.geo.synchronize()
+
+# We can then generate a 2D mesh...
+gmsh.model.mesh.generate(2)
+
+# ... and save it to disk: msh=current format, msh22 older format
+gmsh.write("mesh_basin.msh")
+
+# Remember that by default, if physical groups are defined, Gmsh will export in
+# the output mesh file only those elements that belong to at least one physical
+# group. To force Gmsh to save all elements, you can use
+#
+# gmsh.option.setNumber("Mesh.SaveAll", 1)
+
+# By default, Gmsh saves meshes in the latest version of the Gmsh mesh file
+# format (the `MSH' format). You can save meshes in other mesh formats by
+# specifying a filename with a different extension. For example
+
+# gmsh.write("basinMesh.pdf") only accessible via GUI
+# gmsh.write("basinMesh.pvtu")
+# gmsh.write("basinMesh.vtk")
+# gmsh.write("basinMesh.unv")
+# gmsh.write("basinMesh.stl")
+
+# will save the mesh in the vtk, unv and stl format.
+
+# To visualize the model we can run the graphical user interface with:
+gmsh.fltk.run()
+
+
+# Note that starting with Gmsh 3.0, models can be built using other geometry
+# kernels than the default "built-in" kernel. To use the OpenCASCADE geometry
+# kernel instead of the built-in kernel, you should use the functions with the
+# `gmsh.model.occ' prefix.
+#
+# Different geometry kernels have different features. With OpenCASCADE, instead
+# of defining the surface by successively defining 4 points, 4 curves and 1
+# curve loop, one can define the rectangular surface directly with
+#
+# gmsh.model.occ.addRectangle(.2, 0, 0, .1, .3)
+#
+# Boolean operation using OpenCascade module (occ, see below)
+# gmsh.model.occ.cut([(3, 1)], [(3, 2)], 3)
+#
+# After synchronization with the Gmsh model with
+#
+# gmsh.model.occ.synchronize()
+#
+# the underlying curves and points could be accessed with
+# gmsh.model.getBoundary().
+#
+# See e.g. `t16.py', `t18.py', `t19.py' or `t20.py' for complete examples based
+# on OpenCASCADE, and `demos/api' for more.
+
+# This should be called when you are done using the Gmsh Python API:
+gmsh.finalize()
diff --git a/web/content/docs/tools/getting-started/video-tutorial/timeBCs_glacier.py b/web/content/docs/tools/getting-started/video-tutorial/timeBCs_glacier.py
new file mode 100644
index 00000000000..a7516cf8fea
--- /dev/null
+++ b/web/content/docs/tools/getting-started/video-tutorial/timeBCs_glacier.py
@@ -0,0 +1,35 @@
+import OpenGeoSys
+import glacierclass as glc
+
+L_dom = 120000 # m
+L_max = 0.7 * L_dom # m
+H_max = 200 # m
+x_0 = -0.5 * L_dom # m
+t_0 = 0.00 # s
+t_1 = 1.0000 # s
+
+
+class BC_Y(OpenGeoSys.BoundaryCondition):
+ def __init__(self, L_dom, L_max, H_max, x_0, t_0, t_1):
+ super(BC_Y, self).__init__()
+ # instantiate the glacier member object
+ self.glacier = glc.glacier(L_dom, L_max, H_max, x_0, t_0, t_1)
+ self.glacier.printMaxLoads()
+ self.glacier.plotEvolution()
+
+ def getFlux(
+ self, t, coords, primary_vars
+ ): # here Neumann BC: flux of linear momentum
+ x, y, z = coords
+
+ # print("x = ", x)
+ # print("t = ", t)
+ # print("s = ", self.glacier.normalstress_glacier(x,t))
+ value = self.glacier.normalstress(x, t)
+ derivative = [0.0, 0.0]
+
+ return (True, value, derivative)
+
+
+# instantiate the BC objects used by OpenGeoSys
+bc_y = BC_Y(L_dom, L_max, H_max, x_0, t_0, t_1)
--
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