Hi,
You can create a UDF with macro DEFINE_PROFILE into which you can mention the frequency and amplitude.
You can find more details in fluent customization manual: 2.3. Model-Specific DEFINE Macros (ansys.com)
If you are not able to access the link, please refer to this forum discussion: https://forum.ansys.com/forums/topic/using-help-with-links/#latest
Thank you