[raminostadi]

hello experts.
I saw many udf about unsteady flow. for define time use this form:
''double t = (CURRENT_TIME*(A)-floor(CURRENT_TIME*(A)))/(A); //t is the local time within each period''

I saw 2 examples. in one of them time period was 0.5 s and A =2 and in other example time period was 0.8 s and A=1.25.I guess A=1/T In this 2 examples :
''https://www.researchgate.net/post/Does_anyone_know_how_to_create_a_UDF_file_for_puls atile_parabolic_velocity_profile_as_an_inlet_bound ary_condition_for_ANASYS_Fluent_CFD_Simulation''

My question is: what is the ''A'' in this form? Is it time period or time of simulation? Is My guess is true: A=1/T ??

I'm working on pulse blood flow and my time period is 0.7535 s.
now what number I input in A.???