GMS:Assign Node/Face BC: Difference between revisions
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{{FEMWATER Links}} | {{FEMWATER Links}} | ||
The | The '''Assign Node/Face BC''' command in the ''FEMWATER'' menu is used to either assign a new boundary condition or edit an existing boundary condition to a selected set of boundary nodes or boundary element faces. The dialog that appears depends on whether nodes or faces are selected. | ||
===Nodal Boundary Conditions=== | ===Nodal Boundary Conditions=== | ||
If a set of nodes is selected when the | If a set of nodes is selected when the '''Assign Node/Face BC''' command is selected, the ''Node BC'' dialog appears. Boundary conditions assigned to nodes correspond to Dirichlet boundary conditions. Both head and concentration can be specified. | ||
====Head==== | ====Head==== | ||
Head boundary conditions in FEMWATER are assigned as total head. FEMWATER converts the total heads to pressure heads internally. Heads can be specified as a constant value or as a transient value (curve of head vs. time). | Head boundary conditions in FEMWATER are assigned as total head. FEMWATER converts the total heads to pressure heads internally. Heads can be specified as a constant value or as a transient value (curve of head vs. time). | ||
The '''Load Dataset''' button can be used to assign the head values from a dataset. For example, if the | The '''Load Dataset''' button can be used to assign the head values from a dataset. For example, if the elevation dataset is selected, the head is set equal to the node elevation at each of the selected nodes. | ||
====Concentration==== | ====Concentration==== | ||
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====Face Boundary Conditions==== | ====Face Boundary Conditions==== | ||
If a set of faces is selected when the '''Assign Node/Face BC''' command is selected, the ''Face BC'' dialog appears. Boundary conditions assigned to faces are flux-type boundary conditions. Both flux and concentration can be assigned independently. In both cases, the type must be designated as either | If a set of faces is selected when the '''Assign Node/Face BC''' command is selected, the ''Face BC'' dialog appears. Boundary conditions assigned to faces are flux-type boundary conditions. Both flux and concentration can be assigned independently. In both cases, the type must be designated as either variable, flux (Cauchy), or flux gradient (van Neumann). The value can be defined as a constant or transient value. | ||
Existing boundary conditions can be deleted by selecting the boundary condition with the [[GMS:3D Mesh Tool Palette|'''Select Boundary Nodes''']], [[GMS:3D Mesh Tool Palette|'''Select Boundary Faces''']], or [[GMS:3D Mesh Tool Palette|'''Select Wells''']] tool and selecting the '''Delete BC''' command from the ''FEMWATER'' menu. | Existing boundary conditions can be deleted by selecting the boundary condition with the [[GMS:3D Mesh Tool Palette|'''Select Boundary Nodes''']], [[GMS:3D Mesh Tool Palette|'''Select Boundary Faces''']], or [[GMS:3D Mesh Tool Palette|'''Select Wells''']] tool and selecting the '''Delete BC''' command from the ''FEMWATER'' menu. | ||
