Transient boundary condition

harerton · July 29, 2011, 16:01

Hi,

I am preparing a LES simulation in CFX13 and I want the inlet velocity profile to vary with time. I have the time series of velocity u, v and w components from a previous simulation for some points of the inlet boundary. How do I make CFX read these values at each timestep?

Thanks!

ghorrocks · July 30, 2011, 09:10

I assume you have quite a bit of spacial and temporal resolution in your dataset so that it is too big to fit in CEL. In that case probably best to write a fortran routine which reads the file each timestep.

harerton · August 1, 2011, 11:05

Thanks for answering!

Do you have any idea of where I can find a similar example or a tutorial? The help files were not of much help.

Thanks!

ghorrocks · August 1, 2011, 19:26

I don't know of any available examples, but CFX support probably has one at hand. I would ask them.

harerton · August 2, 2011, 12:01

Thanks! I'll try to contact them!

kjrzyh · January 10, 2013, 03:52

Quote:

Originally Posted by harerton

Hi,

I am preparing a LES simulation in CFX13 and I want the inlet velocity profile to vary with time. I have the time series of velocity u, v and w components from a previous simulation for some points of the inlet boundary. How do I make CFX read these values at each timestep?

Thanks!

Hi,harerton.I meet the same problem with you.I want to by the uesr fortran to solve.but i don't how to do .Can you tell me your method? thank you!

July 29, 2011, 16:01	Transient boundary condition	#1
harerton New Member Join Date: Jan 2010 Posts: 15 Rep Power: 16	Hi, I am preparing a LES simulation in CFX13 and I want the inlet velocity profile to vary with time. I have the time series of velocity u, v and w components from a previous simulation for some points of the inlet boundary. How do I make CFX read these values at each timestep? Thanks!

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July 30, 2011, 09:10		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	I assume you have quite a bit of spacial and temporal resolution in your dataset so that it is too big to fit in CEL. In that case probably best to write a fortran routine which reads the file each timestep.

August 1, 2011, 11:05		#3
harerton New Member Join Date: Jan 2010 Posts: 15 Rep Power: 16	Thanks for answering! Do you have any idea of where I can find a similar example or a tutorial? The help files were not of much help. Thanks!

August 1, 2011, 19:26		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	I don't know of any available examples, but CFX support probably has one at hand. I would ask them.

August 2, 2011, 12:01		#5
harerton New Member Join Date: Jan 2010 Posts: 15 Rep Power: 16	Thanks! I'll try to contact them!