Download NM-SESES Tutorial - Numerical Modelling GmbH

10
SESES Tutorial September 2012
• Parameter definition: Parameters can be defined for use in the material laws and
geometry definitions.
• Material definition: Materials are defined by specifying material laws and parameters that are responsible for the physical properties.
• Geometry definition: The problem geometry and dimension is specified.
• Material mapping: Materials are assigned to local or global domains of the defined
geometry.
• Boundary condition (BC) definition: The boundary conditions for the problem
domain need to be specified which basically consider the interactions with the
outside world i.e. where no modeling is performed.
• Minimum Refinement Level: The refinement level selects the number of refinement steps starting from the initially coarse mesh. A minimum refinement level
can be set.
The command section contains the following important parts:
• Solution procedure: The computation of numerical solutions.
• Accuracy: Adaptively refine the computational mesh to obtain solutions with enough accuracy.
• Post-processing: Writing of computed fields into a graphics data file Data for
visualization inside the Front End program and generation of relevant data for
further post-processing tasks.
This typical structure of the input files is displayed with the help of comments in the
tutorial examples included within the distribution. The input files are written in an
input description language whose keywords are highlighted in blue and comments
in violet inside the text editor. In case of syntax errors, the first invalid input line is
highlighted in red. For detailed informations on the input syntax, please consult the
manual explaining the syntax requirements with the help of railway diagrams.
Starting the Front End program
The Front End program can be launched by clicking the executables g2d or g3d inside
a browser or by entering in a shell the command g2d <file> or g3d <file> with
an optional file name. If the input file is not specified, you can open one by selecting
button. However, if the associations for the file endings .s2d, .s3d and
the open
the executables g2d, g3d are set appropriately, the most common way to start the
Front End program is by clicking on the input file inside a browser.
To illustrate the navigation, simulation and visualization, we shall next consider a
simulation example of a lake with a dam. The situation is depicted in Fig. 1.2 and the
input file is found at example/Dam.s2d. For this problem, we want to compute and
visualize the mechanical stress and displacement in the 2D cross-section of the dam