time-dependent free-stream velocity setup in SU2

[thunderqd]

Hello,

In the operation of SU2, I noticed that the Mach_Number (and the corresponding Mach_Motion) can only enter a fixed value in the configuration file, but I want the free-stream velocity to vary slightly over time. When I input a slightly changed function (wave) it produces the following error:

Error in "void CConfig::SetConfig_Parsing(std::istream&)":
-------------------------------------------------- -----------------------
MACH_NUMBER: multiple values for type su2double

------------------------------ Error Exit ------------------ -------------

I'm wondering if it's possible to set time-dependent free-stream velocity (Mach_Number), if hardcoded. Which file is related to this variable?

Thank you!