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Figure 11. The Hexahedral Domain Definition dialog window.
In the Domain Type and Units dialog Window (Figs. 6 and 7) users also select the geometry
Units to be used throughout the application (mm, cm, m) and the size of the Initial Project
Group. When units are changed during specification or after reading the input data, then all
input variables are automatically converted into the new units.
Initial Project Group: This part of the dialog allows users to define the initial dimensions of the
graphical view window.
Model Precision and Resolution: Epsilon is a minimum resolution recognized when defining
geometric objects. Epsilon is by default defined as R/100,000, where R is a domain radius, i.e., a
radius of a circle/sphere circumscribing the domain. Epsilon is used, for example, for evaluation
of positions of two points. If their distance is less than Epsilon, then the two points are replaced
by a single point. A user-defined epsilon may lead to unstable behavior of the program and it is
intended only for advanced users who may need it for special purposes. A correct functionality
of geometrical calculations and generation of FE-meshes is not guaranteed for user-defined
epsilons.
Edit Properties on Geometric Objects: When the check box "Edit domain properties, initial
and boundary conditions on geometric objects" is checked, users can specify various properties
and conditions on the Geometric Objects (See Section 6.5 "Defining Properties on Geometric
Objects" for details), rather than only on FE-Mesh, as available in Version 1.0 of HYDRUS. This
option will be by default "On" for new projects, and it is "Off" for projects converted from
Version 1.0. Users can turn this option "Off" and continue defining various properties on FEMesh, as they have been used to. Users can turn this option "On" for projects converted from
Version 1.0 of HYDRUS. However, they will then lose their original definitions and will have to
specify them again on Geometric Objects.
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