{"id":41535,"date":"2020-03-05T19:27:31","date_gmt":"2020-03-05T19:27:31","guid":{"rendered":"\/forum\/forums\/topic\/how-to-add-time-dependent-velocity-expression-for-magnitude-of-an-inlet\/"},"modified":"2020-03-05T19:27:31","modified_gmt":"2020-03-05T19:27:31","slug":"how-to-add-time-dependent-velocity-expression-for-magnitude-of-an-inlet","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-add-time-dependent-velocity-expression-for-magnitude-of-an-inlet\/","title":{"rendered":"How to add time dependent velocity expression for magnitude of an inlet?"},"content":{"rendered":"

Hi friends,
so I have a fairly simple setup: I have 3 bottom inlets that let hot water (370 Kelvin) flow into colder water (280 Kelvin).<\/p>\n

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Currently I have the velocity magnitude set to 0.3 m\/s but now I would like to make it time dependent.  
As a first step I simply want to set the velocity magnitude of the inlets to equal the time in s.  
How would I go on about doing that. I already looked in the users guide but honestly couldn’t really find anything and google was of no help either.  
How do I reference t (in seconds) in the simulation?  
The expression should basically look like this:  “t [m s^-1]” but that results in an error.  
Can anyone help me out?<\/p>\n

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Edit. So in the end I would like to make a velocity magnitude that appears somewhat random. So that the inlet always keeps changing its velocity every time step; maybe between 0 – 1 m\/s<\/p>\n","protected":false},"template":"","class_list":["post-41535","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t