fluent probelm"mesh motion udf"
 

hi i have some probelm while solving the motion of piston probelm i.e in dynamic mesh zone and in "mesh motion udf" i am unable to highlighting any thing

it is getting an error like this"no motion udf or profile was specified." even though i am having the define_cg_motion program can any body help me very urgent

is there any material available for this