CFX - Read file with values on a BC

kordou · March 22, 2011, 05:55

Hi,

I'd like to ask if anyone know how can i read txt file with values (for example wind velocity on an inlet) and apply this value on a bc (inlet for example) on each step of a transient simulation.

What i need to do is to simulate a ventilated facade for one day with different inlet velocities on every time step

thanks
Kordou

ghorrocks · March 22, 2011, 07:49

Put the values into a 1D interpolation function and use the output of that function to control the boundary condition.

kordou · March 22, 2011, 12:57

the values are quite complex to be in a function.
any way of reading a file

joey2007 · March 22, 2011, 14:48

Have a look into the manual: there is a way to export profiles from post. These profiles can be used in CFX-Pre as boundaries.

Export a dummy profile from post. The file is readable with editor. Just overwrite with your values in the same format.

amaly · March 2, 2013, 23:51

But this should be done every time step as the input velocity is changing with time.

ghorrocks · March 3, 2013, 06:21

I am not sure what the previous two posts are talking about, that does not seem relevant to the question.

If the 1D interpolation function is not suitable but you still want to read from a file then you will need to use a fortran user routine.

March 22, 2011, 05:55	CFX - Read file with values on a BC	#1
kordou New Member Join Date: Mar 2009 Posts: 19 Rep Power: 17	Hi, I'd like to ask if anyone know how can i read txt file with values (for example wind velocity on an inlet) and apply this value on a bc (inlet for example) on each step of a transient simulation. What i need to do is to simulate a ventilated facade for one day with different inlet velocities on every time step thanks Kordou

March 22, 2011, 14:48		#4
joey2007 Senior Member Join Date: Mar 2009 Location: Europe Posts: 169 Rep Power: 17	Have a look into the manual: there is a way to export profiles from post. These profiles can be used in CFX-Pre as boundaries. Export a dummy profile from post. The file is readable with editor. Just overwrite with your values in the same format. __________________ - - - - - ------------------------------------------------------------------------ Please do not forget: I am not paid for answering your questions. Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."

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March 22, 2011, 07:49		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	Put the values into a 1D interpolation function and use the output of that function to control the boundary condition.

March 22, 2011, 12:57		#3
kordou New Member Join Date: Mar 2009 Posts: 19 Rep Power: 17	the values are quite complex to be in a function. any way of reading a file

March 2, 2013, 23:51		#5
amaly New Member Join Date: Mar 2013 Posts: 4 Rep Power: 13	But this should be done every time step as the input velocity is changing with time.

March 3, 2013, 06:21		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	I am not sure what the previous two posts are talking about, that does not seem relevant to the question. If the 1D interpolation function is not suitable but you still want to read from a file then you will need to use a fortran user routine.