34.5.2 Adapt/Gradient...

The Adapt/Gradient... menu item opens the Gradient Adaption dialog box.

Gradient Adaption Dialog Box

The Gradient Adaption dialog box allows you to mark or adapt to gradients of a specified field variable. See Section  27.3 for details.

Controls

Options   contains the check buttons that toggle the ability to mark and/or adapt cells for refinement or coarsening.

Refine   toggles the ability to refine or mark cells for refinement.

Coarsen   toggles the ability to coarsen or mark cells for coarsening (available in 2D and axisymmetric cases).

Normalize per Zone   toggles the ability of zonal normalization.

Contours...   opens the Contours dialog box, which you can use as an aid to selecting adaption thresholds by displaying contours of adaption function.

Manage...   opens the Manage Adaption Registers dialog box, which allows you to display and manipulate adaption registers that are generated using the Mark command.

Controls...   opens the Mesh Adaption Controls dialog box, which allows you to control certain aspects of the adaption process.

Method   contains options for specifying the criterion for adaption.

Curvature   specifies the use of the second gradient of a field variable for adaption. This approach is recommended for problems with smooth solutions.

Gradient   specifies the use of the first gradient of a field variable for adaption. This approach is recommended for problems with strong shocks.

Iso-Value   allows you to customize the adaption criterion (using custom field functions, user-defined scalars, etc.).

Normalization   contains the options available for normalization.

Standard   specifies that the gradient or curvature is not normalized.

Scale   specifies that the gradient or curvature is scaled by its average value in the domain.

Normalize   specifies that the gradient or curvature is scaled by its maximum value in the domain (i.e. the gradient or curvature is bounded by [0, 1]).

Dynamic   contains options to specify dynamic gradient adaption.

Dynamic   enables dynamic gradient adaption.

Interval   allows you to specify the number of iterations or time-steps between two consecutive automatic mesh adaptions, depending on whether you are performing a steady-state or a time-dependent solution, and on which solver you are using.

Gradients of   contains a list of the field variables that can be used in the gradient adaption function.

Min/Max   displays the minimum and maximum cell values of the gradient adaption function based on the selected quantity.

Coarsen Threshold   designates the threshold values for coarsening the mesh. Cells with adaption function values below the Coarsen Threshold will be marked for coarsening.

Refine Threshold   designates the threshold values for refining the mesh. Cells with adaption function values above the Refine Threshold will be marked for refinement.

Adapt   adapts the mesh based on the gradients of the selected scalar quantity, the coarsening and refining toggle buttons and thresholds, and the adaption limits.

Mark   marks cells to be refined and/or coarsened based on the gradients of the selected quantity and the coarsening and refining toggle buttons and thresholds. This command produces an adaption register. For information on using adaption registers, see Section  27.11.1.

Compute   computes the minimum and maximum cell values of the gradient adaption function with the selected scalar quantity. The values are displayed in the Min and Max real number fields.