Blood flow in aorta

milasko · April 20, 2011, 06:56

Hello. I need to determine physical dimensions of blood flow in abdominal aorta. Can you tell me how to insert profile velocity in function of time as inlet boundary? I attached velocity function of time.

ghorrocks · April 20, 2011, 18:58

A user function with a 1D interpolation will do it easily.

milasko · April 21, 2011, 04:11

Can you describe how to do it?I started recently to use CFX.

kmgraju · April 21, 2011, 11:33

Dear friend

I am also doing the same problem .
I want to know how did you get the graph?
what function did you use to get the graph?
I also need this answer. please give your answer if you find.

Thank you

Govind

vmlxb6 · April 22, 2011, 11:22

This should help you out:

http://www.edr.no/blogg/ansys_blogge...nsient_profile

Regards

milasko · April 22, 2011, 12:25

My professor is working with vascular problems. He measured blood velocity in coronal arthery. I adjusted his values for my problem.

kmgraju · April 26, 2011, 06:35

My professor is working with vascular problems. He measured blood velocity in coronal arthery. I adjusted his values for my problem.

Dear milasko

How your professor got the values .what function did he use for getting number of values.
if he uses any function like sin or cos please let me know.I need it urgently. I assume that without a function cannot get number values . am I right?
what equation did he use to plot the graph?

Thank you

kmgraju

milasko · April 26, 2011, 11:32

I think that he performed examing on the pacient.I didn`t ask.The reason is that he is not at my department, I took exam because I earlier worked in FLUENT some simple cases.

milasko · July 2, 2011, 07:14

I fill out csv file format for profile boundary condition. when I try to initialise profile data I receive error "Invalid data heading seen in profil `ulaz` at line 8. Between 1 and 3 spatial field names must be specified." Can you tell me what is wrong? I attached picture of profile boundary condition.

Lance · July 4, 2011, 02:33

"Between 1 and 3 spatial field names must be specified."

You specify X,Y,Z,t == 4 "spatial" fields. If you want to include time you must remove one of the spatial fields.

milasko · July 4, 2011, 04:41

Ok.I understand. I didn`t know that I can`t specify more than 3 fields.Thanks a lot.

ld1305 · February 7, 2012, 16:38

I realise this is a few months old, but was wondering about something similar, I've looked through the website that was suggested and wondered what the spacial fields actually represent? At the moment I just have time and velocity

milasko · February 8, 2012, 03:00

Spatial fields have function to identify nodes positions to which you have dedicate velocity

ld1305 · February 8, 2012, 10:07

That makes sense and is what I suspected anyway, but when I run my simulation it seems to not let me view more than one time-step, I only have 0, though the function file I made says it should last 1 second, do you know how I'd fix this so I could view it at different points within my 1 second?

milasko · February 8, 2012, 12:07

Take a look on 5th post.You would notice that you need to set different time value for other steps

ld1305 · February 8, 2012, 12:18

Do you mean different values as in:

this

milasko · February 8, 2012, 13:33

Yes, like that

ld1305 · February 8, 2012, 13:36

I had done that before, what I'm asking is if there is a way to view the fluid at say the first time-frame and the last, similar to the example in the 5th post? I can't find this...

milasko · February 9, 2012, 11:08

you need to perform calculation and after that using CFD-Post you can see fluid velocities

shaswat · February 9, 2012, 18:42

Hi

Is your flow in the x direction?

April 21, 2011, 11:33	Function	#4
kmgraju Senior Member Govindaraju Join Date: Apr 2010 Posts: 209 Rep Power: 17	Dear friend I am also doing the same problem . I want to know how did you get the graph? what function did you use to get the graph? I also need this answer. please give your answer if you find. Thank you Govind

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April 20, 2011, 18:58		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	A user function with a 1D interpolation will do it easily.

April 21, 2011, 04:11		#3
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	Can you describe how to do it?I started recently to use CFX.

April 22, 2011, 11:22		#5
vmlxb6 Senior Member Ugly Kid Joe Join Date: Aug 2010 Posts: 193 Rep Power: 15	This should help you out: http://www.edr.no/blogg/ansys_blogge...nsient_profile Regards

April 22, 2011, 12:25		#6
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	My professor is working with vascular problems. He measured blood velocity in coronal arthery. I adjusted his values for my problem.

April 26, 2011, 06:35		#7
kmgraju Senior Member Govindaraju Join Date: Apr 2010 Posts: 209 Rep Power: 17	My professor is working with vascular problems. He measured blood velocity in coronal arthery. I adjusted his values for my problem. Dear milasko How your professor got the values .what function did he use for getting number of values. if he uses any function like sin or cos please let me know.I need it urgently. I assume that without a function cannot get number values . am I right? what equation did he use to plot the graph? Thank you kmgraju

April 26, 2011, 11:32		#8
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	I think that he performed examing on the pacient.I didn`t ask.The reason is that he is not at my department, I took exam because I earlier worked in FLUENT some simple cases.

July 4, 2011, 02:33		#10
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	"Between 1 and 3 spatial field names must be specified." You specify X,Y,Z,t == 4 "spatial" fields. If you want to include time you must remove one of the spatial fields.

July 4, 2011, 04:41		#11
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	Ok.I understand. I didn`t know that I can`t specify more than 3 fields.Thanks a lot.

February 7, 2012, 16:38		#12
ld1305 Member Lauren Dransfield Join Date: Jan 2012 Posts: 50 Rep Power: 14	I realise this is a few months old, but was wondering about something similar, I've looked through the website that was suggested and wondered what the spacial fields actually represent? At the moment I just have time and velocity

February 8, 2012, 03:00		#13
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	Spatial fields have function to identify nodes positions to which you have dedicate velocity

February 8, 2012, 10:07		#14
ld1305 Member Lauren Dransfield Join Date: Jan 2012 Posts: 50 Rep Power: 14	That makes sense and is what I suspected anyway, but when I run my simulation it seems to not let me view more than one time-step, I only have 0, though the function file I made says it should last 1 second, do you know how I'd fix this so I could view it at different points within my 1 second?

February 8, 2012, 12:07		#15
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	Take a look on 5th post.You would notice that you need to set different time value for other steps

February 8, 2012, 12:18		#16
ld1305 Member Lauren Dransfield Join Date: Jan 2012 Posts: 50 Rep Power: 14	Do you mean different values as in: this

February 8, 2012, 13:33		#17
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	Yes, like that

February 8, 2012, 13:36		#18
ld1305 Member Lauren Dransfield Join Date: Jan 2012 Posts: 50 Rep Power: 14	I had done that before, what I'm asking is if there is a way to view the fluid at say the first time-frame and the last, similar to the example in the 5th post? I can't find this...

February 9, 2012, 11:08		#19
milasko New Member Marko Milasinovic Join Date: Apr 2011 Posts: 23 Rep Power: 15	you need to perform calculation and after that using CFD-Post you can see fluid velocities

February 9, 2012, 18:42		#20
shaswat Senior Member Shashwat Join Date: Nov 2011 Posts: 107 Rep Power: 14	Hi Is your flow in the x direction?