Length of streamline in CFD post

NewToAnsys · April 18, 2019, 05:45

Hello,

1. How can I find the average length of the streamlines from the inlet face to the outlet face?

I was going to divide that by the "volumeAve(Velocity)@Assembly" to find the approximate residence time of the fluid in the geometry.

2. Also, what exactly does "Length Average of Time on Streamline 1" give me? Is it the average time the streamline takes from start to end?

Thank you for your inputs!

ghorrocks · April 18, 2019, 06:59

1 Try something like Ave(length)@<streamline object name>
2 The streamline is made up of small segments. At each segment you have a time along streamline. So "length average of time on streamline 1" means the average of all those segments from the start (where time =0) to the end (where time = max time). As you are taking the length average then it should return half of the maximum time.

NewToAnsys · April 18, 2019, 07:41

2. aha, thank you. So then I guess 2 times of "length average of time on streamline 1" gives me the max. residence time of the fluid in the geometry directly

kjetil · May 8, 2019, 08:16

Quote:

Originally Posted by NewToAnsys

Hello,

1. How can I find the average length of the streamlines from the inlet face to the outlet face?

I was going to divide that by the "volumeAve(Velocity)@Assembly" to find the approximate residence time of the fluid in the geometry.

Thank you for your inputs!

You can also do a "length()@<Streamline name>", and then divide this by the number of streamlines.

April 18, 2019, 05:45	Length of streamline in CFD post	#1
NewToAnsys New Member Join Date: Oct 2018 Posts: 17 Rep Power: 7	Hello, 1. How can I find the average length of the streamlines from the inlet face to the outlet face? I was going to divide that by the "volumeAve(Velocity)@Assembly" to find the approximate residence time of the fluid in the geometry. 2. Also, what exactly does "Length Average of Time on Streamline 1" give me? Is it the average time the streamline takes from start to end? Thank you for your inputs! Last edited by NewToAnsys; April 18, 2019 at 07:31.

April 18, 2019, 06:59		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,715 Rep Power: 143	1 Try something like Ave(length)@<streamline object name> 2 The streamline is made up of small segments. At each segment you have a time along streamline. So "length average of time on streamline 1" means the average of all those segments from the start (where time =0) to the end (where time = max time). As you are taking the length average then it should return half of the maximum time. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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April 18, 2019, 07:41		#3
NewToAnsys New Member Join Date: Oct 2018 Posts: 17 Rep Power: 7	2. aha, thank you. So then I guess 2 times of "length average of time on streamline 1" gives me the max. residence time of the fluid in the geometry directly