In the Mesh Size node () specify how the predefined mesh sizes generate meshes. If the physics interface is the controlling interface for the mesh, these settings are used when automatically generating the mesh each time it is solved. Right-click the Mesh Defaults node to add a Mesh Size node.

Fill in the table with suitable values for the Size settings:

Also define these values for each of the predefined mesh sizes: Extremely fine,  Extra fine,  Finer,  Fine,  Normal,  Coarse,  Coarser,  Extra coarse, and  Extremely coarse.