I think the UDF (user defined function) in Ansys-Fluent in the following attachment will help you. Please find it:

 http://jullio.pe.kr/fluent6.1/help/pdf/udf/fl61udf.pdf

Hello 

You can digitize the figs then you reconstruct the velocity and pressure function by using the fourier series to write the udf by using the unsteady velocity and unsteady pressure macros ( see the fluent udf user guide for more details ) .

Best

Djelloul

Dear Djelloul,

Thanks for the response 

You could define a profile for velocity and pressure as a function of time with UDF. Good luck. 

I think the UDF (user defined function) in Ansys-Fluent in the following attachment will help you. Please find it:

 http://jullio.pe.kr/fluent6.1/help/pdf/udf/fl61udf.pdf

A user-defined function, or UDF, is a function that you program that can be dynamically loaded with the FLUENT solver to enhance the standard features of the code. UDFs are written in the C programming language.

Thank you All, i really appreciate your feedback