DHIJWASv Software FEFLOW 6.1

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Figure 7.1 Problem Settings dialog.
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A transport simulation is always performed in conjunction
with a flow simulation. FEFLOW provides
capabilities for single-species and multispecies solutetransport
simulation, heat-transport simulation, and
combined mass-and-heat (“thermohaline”) transport
calculations.
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Transient simulations proceed from an initial condition
and cover a specified time period. In contrast, a
steady-state solution can be obtained directly and represents
the state of a system having been subject to
fixed boundary conditions and material properties for
an infinitely long time. It is possible to combine a
steady-state flow with a transient transport simulation.
In such a case, the flow system is solved once at the
beginning with all storage terms set to zero to obtain a
steady-state solution as the basis for the transient transport
calculation.
Figure 7.2 Simulation types.
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FEFLOW supports 2D and 3D models. Finite elements
of a lower dimension (1D in 2D models, 1D/2D
in 3D models), so-called discrete features can be
added, representing for example fractures or boreholes.
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A newly generated finite-element mesh always represents
a 2D model. Two-dimensional models can be of
horizontal, vertical, or axisymmetric projection.
A typical application for horizontal 2D models are
regional water-management models without significant
vertical flow components. Vertical models are used, for
example, for the simulation of unsaturated flow and
saltwater intrusion. Axisymmetric models have a radial
symmetry such as the cone of a pumping or injection
well. Essential for the suitability of an axisymmetric
model are material properties and outer boundary conditions
that are homogeneous along the circumference
of the well cone or mound.