Unidirectional Flushing test

Question

Hello, 
 My boss is currently having me research on how to do a UDF in watergems, 
 he wants to know if there is a way when doing this test on watergems if it will tell us which valves to open and close during the process so that it is possible for the direction to be only unidirectional like the test says. 
 Is wategems capable of this? or is there a separate program that will tell us which valves to open or close while doing this test? 
 
 Thank You

Tom Walski · Accepted Answer

There is no algorithm to tell you what valves to close. If you have one, let me know. 
 
You basically look at the run you want to flush and see which valves you need to close to flush that run. Then you run the model to see if you got the velocities/shear stress you wanted. 
 
Just remember to always flush with clean water behind you. 
 
Usually, I've found that conventional flushing is adequate in many cases. You may want to look at that first and then use UDF where you need more shear stress.

Alan Frygier · Answer

I do not have one currently, if I do find one however or my boss does I will let you know. 
 
Thank you very much for your answer

MPachlhofer · Answer

There is a feature on the flushing toolbar that can identify valves that, which should be closed to isolate the pipe run that has been selected. The feature is called "auto-isolate" and it automatically chooses the valves along the run to close. There is more information in this wiki on setting up a flushing analysis under the unidirectional flushing section.