motion of piston wave maker

chandra sekhar b

hi

i,am doing project using fluent software

i want to know the udf program code(define_cg_motion) for motion of piston wave maker

my equation is as follows (s/2)(1-e^(5t/2T)(sin(wt)) where s =maximum displacement

t=time

T=time period

w=frequency

Thanks in advance!