How to know when velocity profile is fully developed?

daniel1030 · December 9, 2014, 20:44

Hello,

Right now I created a scalar scene that shows the velocity profile throughout a pipe with water flowing, and by 'looking', I can tell that it is nearly fully developed at around 3 seconds time. Can anyone suggest me a method that will allow me to have a more accurate time at which the velocity profile is fully developed?

Thankyou

Pauli · December 10, 2014, 10:07

Run a steady state solution to convergence?

AMS85 · December 16, 2014, 06:06

A visual check of a scalar scene developing is a pretty reasonable method for judging your solution in this case, however there's no history in a scalar scene. Try creating a couple of reports and plots for velocity related functions through your region (volume average velocity, maximum velocity, etc). Watch these plots as the solver is running and once the lines have levelled out that's a pretty good sign the velocity profile is stable.

vivekcfd · January 15, 2015, 16:20

could you please elaborate more what are you doing? Perhaps I can help you a bit in this issue as I am working almost everyday on the flow development in pipes.
For a fully developed flow profile, the easiest approach is to take a periodic pipe boundary pair for inlet and outlet using the interface approach in starccm+. There you can either set the pressure drop across your pipe or the mass flow.

Once you set the periodic case run the steady-state until convergence. On how to set exactly a periodic pipe you can check the documentation or contact support.

Vivek

December 9, 2014, 20:44	How to know when velocity profile is fully developed?	#1
daniel1030 New Member Join Date: Dec 2014 Posts: 6 Rep Power: 11	Hello, Right now I created a scalar scene that shows the velocity profile throughout a pipe with water flowing, and by 'looking', I can tell that it is nearly fully developed at around 3 seconds time. Can anyone suggest me a method that will allow me to have a more accurate time at which the velocity profile is fully developed? Thankyou

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December 10, 2014, 10:07		#2
Pauli Senior Member Pauli Join Date: Mar 2009 Posts: 189 Rep Power: 17	Run a steady state solution to convergence?

December 16, 2014, 06:06		#3
AMS85 New Member Join Date: Dec 2014 Posts: 3 Rep Power: 11	A visual check of a scalar scene developing is a pretty reasonable method for judging your solution in this case, however there's no history in a scalar scene. Try creating a couple of reports and plots for velocity related functions through your region (volume average velocity, maximum velocity, etc). Watch these plots as the solver is running and once the lines have levelled out that's a pretty good sign the velocity profile is stable.

January 15, 2015, 16:20		#4
vivekcfd Member Vivek Kumar Join Date: Mar 2009 Location: Switzerland Posts: 35 Blog Entries: 1 Rep Power: 17	could you please elaborate more what are you doing? Perhaps I can help you a bit in this issue as I am working almost everyday on the flow development in pipes. For a fully developed flow profile, the easiest approach is to take a periodic pipe boundary pair for inlet and outlet using the interface approach in starccm+. There you can either set the pressure drop across your pipe or the mass flow. Once you set the periodic case run the steady-state until convergence. On how to set exactly a periodic pipe you can check the documentation or contact support. Vivek