SMS:CGWAVE Model Control

File:CGWAVE Model Control.jpg

CGWAVE Model Control dialog

The CGWAVE model requires several user-specified parameters to control the analysis. The Model Control command from the CGWAVE menu opens the Model Control dialog. This dialog contains parameters that control the execution of CGWAVE. The parameter description for each field is displayed in SMS using the interactive help messages.

Controls include:

• Title
• Incident Wave Conditions

The Incident Wave Conditions section allows the user to specify wave conditions to be simulated in a run. See CGWAVE Incident Wave Conditions for more information.

• Open Boundary

The Open Boundary section allows the user to specify the open boundary type. This should match the type selected when generating the domain in the Map Module. If the mesh has been generated using other methods, the domain shape must match the Open Boundary type.

• Semicircular
• Circular
• Boundary condition:

• 1-D Options

The 1-D section allows the user to specify the number of nodes and the nodal spacing for the one-dimensional data that is used to distribute incident wave data to the open boundary. The file format is described in the CGWAVE user manual[1]. The Compute 1-d Length button calculates the 1-d Spacing variable such that the specified number of nodes will extend to the limits of the bathymetry data. This bathymetry data is defined by a scattered dataset. Therefore, a scatter dataset must exist to in order for this button to be active. If no scatter data exists, the user must generate an appropriate file containing the one-dimensional depth values.

• Current 1D Wave Line Settings

• Spacing:
• Length:
• Number of nodes:

• 1D Domain Extension Parameters

• Length to edge of scatter:
• Radius of domain:
• Ideal 1D spacing:
• 1D spacing
• Num. of Nodes
• Minimum 1D Depth
• Update Num. of Nodes
• Update Spacing
• Extract Depths

• Solver Options

  CGWAVE support two separate numerical solvers for robustness. Users select which solver to use via the Solver radio group. The Standard solver should be utilized first. If CGWAVE fails to converge, the Modified method can be utilized.

• Solver:
• Convergence tolerance:
• Output echo frequency:
• Maximum iterations:
• Num. of bessel terms used:

• Iteration Control

CGWAVE allows the user to specify the maximum number of iteration to be performed by the numerical solver. This number is specified in the Maximum Iterations edit field. The solver will terminate after performing the maximum number of iterations or when the change in the solution is less than the convergence tolerance specified in the Convergence Tolerance edit field. It is recommended that the convergence value be between 1.0e-6 and 1.0e-9. CGWAVE will print a progress report on the tolerance at the user specified report interval entered in the Convergence Interval edit field.

• General Parameters

CGWAVE includes options to model bottom friction, wave breaking and nonlinear dispersion. These options may be enabled using the appropriate toggle box. See the CGWAVE user manual for more information about these parameters.

• Bottom friction
• Wave breaker

• Breaking coefficient

Nonlinear dispersion relation

• Convergence tolerance
• Maximum iterations

Related Topics

• CGWAVE Graphical Interface