AnsweredAssumed Answered

Back and forth, cycling flow

Question asked by Chris Morrow on Jul 30, 2014
Latest reply on Aug 4, 2014 by Jared Conway

flow jpg.JPGFlow rate curve.jpg


I'm new to flow simulation and I have gone through a lot of examples and I'm getting a grasp on how effective this tool can be. 

I have a few questions that maybe some of you could help answer.


I have some images here of my project that I'm working on.  I am creating a flow study that has time dependancies.  The inlet flow rate is what I will be changing over time.

I have found where I can specify either an equation or a table of values for flow rate as a function of time.  The main problem I'm running into is that I need to specify a back and forth cyclical flow from +30 ul/s to -30 ul/sec.  Using the table, it will not accept negative values for flow rate (which I guessed it wouldn't but I tried anyway).


How can I create boundry conditions that will allow back and forth flow?  As you can see from the image above (or not due to resolution) I have a flow cycle period of 3 cycles / 5 seconds.


Thanks in advance for any help