Steps for moving and deforming mesh
 

Hi everybody! Could someone explain me how to use the udf for moving and deforming mesh? I mean the DEFINE_CG_MOTION DEFINE_GEOM DEFINE_GRID_MOTION In the manual is not so comprehensible. What i'have to use for modelling a plunge motion of a 2D airfoil?

PS Please let me out of cilinder case!!!