MATH
feflow_user_manual_classic.pdf

# The problem measure section 38 menu the mesh geometry

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The Problem measure (Section 3.8) menu, the Mesh geometry editor (Section 4.8) and the Problem summary (Section 4.9) were described in the previous sections. In the following subsections, we discuss the main properties of the editor in detail. Note that all working steps within the menus can be carried out with or without zooming. RKO mêçÄäÉã `ä~ëë The Problem classifier dialog has three functions: specifying the problem title, setting the problem class, and specifying the problem projection. Refer to the Reference manual for background information on problem classes and projections. The current problem title can be changed to a new project title, which will appear in the data files. The General type of problem distinguishes between the classical Saturated media (groundwater) approach and Unsaturated or variably saturated media . Figure 5.1 Problem definition.

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cbcilt SKM `ä~ëëáÅ ö QR RKO mêçÄäÉã `ä~ëë A problem can have one of two distinct problem classes: Flow only or • Flow & mass/heat/thermohaline transport Types of simulation in the Flow only class are steady and transient flows. For unsaturated problems a choice between the standard Richards equation and steady-state linearization has to be made. Steady-state linearization is an extremely fast solution method whose applicability is restricted to special conditions. For further information see online Help and the FEFLOW White Paper ’Steady-state linearized Rich- ards equation for fast solution of unsaturated flow sys- tems (FUSY)’. In the Flow & transport problem class, there are three choices: • steady flow and steady transport, • steady flow and transient transport (default), or • transient flow and transient transport. Please note that in ’steady flow and transient trans- port’ mode only one iteration is performed for the flow. That means that the initial conditions for flow have to reflect steady state conditions! In the case of mass transport, either ’ single-species or ’ multi-species ’ transport can be conducted. For multi-species transport, an arbitrary number of species can be chosen. A separate editor allows the definition of names for the species. Each of the species can be dissolved in the fluid phase (’Fluid’) or bound to the matrix (’Solid’). The latter ones are not subject to dis- placement. For details and theory of multi-species transport modeling, see White Papers Vol. IV. Also, different cases of 2D problem projection can be selected: • horizontal (default), • vertical, or • axisymmetric problems. Horizontal problems are aquifer-averaged flow and transport processes, while vertical and axisymmetric problems correspond to cross-sectional and meridional models, respectively. Vertical and axisymmetric projec- tions are the only available 2D projections for unsatur- ated media and for gravity-affected, fluid density- coupled problems. 2D vertical or axisymmetric models in saturated mode are always confined. To represent free surface conditions an unsaturated simulation has to be performed for such kind of models. Note that for
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