Perform Box Refinement
Use the Refine: Box tool to refine elements enclosed inside a box.
Before you begin, make sure the initial mesh is a regular mapped quad mesh, and not a free quad mesh.
- 
                From the 2D ribbon, click the  tool.
                Figure 1.  
 
- Optional: 
                On the guide bar, click  to define refinement
                    options. to define refinement
                    options.
- 
                Select the center node to start the uniform mesh refinement.
                A refinement box is created.
- 
                Adjust the size and shape of the refinement box by clicking on a face and
                    dragging the slider or inputting a value in the microdialog.
                The refinement box determines the constant refinement zone. Elements inside this box should be the same size.
- 
                Click Transition: Elements on the guide bar.
                A transition box is created.
- 
                Adjust the size and shape of the transition box in a similar manner to the
                    refinement box.
                The mesh will be transitioned to match the initial mesh.Note: The transition box should enclose the refinement box. The size of the transition box determines how aggressive the transition will be. It is recommended that you limit the transition to 1 element connection 3 elements (1:3).
- Click Review on the guide bar to preview the box.
- 
                Click the box, enter a refinement size in the microdialog, then click Refine.
                The size should be smaller than the initial mesh.