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2.Model your system using solid modeling procedures, creating meshable areas or volumes describing the geometry of your system. It is not necessary to specify element sizes, nor do you need to mesh these areas and volumes; the ADAPT macro initiates meshing automatically. (If you need to mesh your model with both area and volume elements, create an ADAPTMSH.MAC subroutine.

3.You can either proceed to SOLUTION (/SOLU or menu path Main Menu> Solution) or remain in PREP7 to specify analysis type, analysis options, loads, and load step options. Apply only solid model loads and inertia loads (accelerations, rotational accelerations, and rotational velocities) in a single load step. (Finite element loads, coupling, and constraint equations can be introduced through the ADAPTBC.MAC subroutine. Multiple load steps can be introduced through the ADAPTSOL.MAC subroutine.)

4.If in /PREP7, exit the preprocessor (FINISH). (You can invoke the ADAPT macro from either SOLUTION or the Begin level.)

5.Invoke the adaptive solution. To do so, use one of these methods:

Command(s): ADAPT

GUI: Main Menu> Solution> Solve> Adaptive Mesh

You can use the ADAPT macro in either a thermal or a structural analysis, but you cannot combine the two disciplines in one adaptive solution. As the adaptive meshing iterations proceed, element sizes are adjusted (within the limits set by FACMN and FACMX) to decrease and increase the elemental

error energies until the error in energy norm matches the target value (or until the specified maximum number of solutions has been used).

After you have invoked the adaptive solution, this macro controls all program operations until the solution is completed. The ADAPT macro will define element sizes, generate the mesh, solve, evaluate errors, and iterate as necessary till the target value of error in energy norm is met. All these steps are performed automatically, with no further input required from you.

6.When adaptive meshing has converged, the program automatically turns element shape checking on (SHPP,ON). It then returns to the SOLUTION phase or to the Begin level, depending on which phase you were in when you invoked ADAPT. You can then enter /POST1 and postprocess as desired, using standard techniques.

3.3. Modifying the Adaptive Meshing Process

This section describes how to modify adaptive meshing by employing selective adaptivity, enhancing the ADAPT macro's functionality via user subroutines, and customizing the ADAPT macro itself via the UADAPT macro.

3.3.1. Selective Adaptivity

If you know that mesh discretization error (measured as a percentage) is relatively unimportant in some regions of your model (for instance, in a region of low, slowly-changing stress), you can speed up your analysis by excluding such regions from the adaptive meshing operations. Also, you might want to exclude regions near singularities caused by concentrated loads. Selecting logic provides a way of handling such situations.