[raminostadi]

Hello experts. I am working on blood flow.

I have pulse pressure boundry condition in outlet (pressure depends on time) and pulse velocity in inlet( depends on time).

I don't have pressure or velocity formula , therefore I can't use udf for define boundry condition.

I just have 2 charts for time-pressure and time-velocity and I have points of this 2 charts in Excel.

How can I import this data's table to Ansys fluent as boundry conditions?

please help me.
thank you

[LuckyTran]

You can make a .prof file and read it into Fluent it's just a text file with coordinates or time and all the field variables.

Check out Section 3.6 in the Fluent User's Guide on reading and writing profiles. and Section 6.6 specifically on Profiles. 6.6.2 is the format for the x,y,z profile. Also search this forum for examples.

6.6.5 has the format for a transient file, which I have copy and pasted here.
((sampleprofile transient 3 0)
(time
1
2
3
)
(u
10
20
30
)
)

The parentheses aren't actually necessary but can speed things up because it allows Fluent to skip groups that are not needed.

[vasava]

I am guessing that you are simulating blood flow. Are you?

I have not seen excel directly connected to fluent. But I recommend that with excel you obtain a curve that best fits your data and create a UDF using these functions. DEFINE_PROFILE is most commonly used for time-dependent boundary conditions.

[raminostadi]

thank you for your attention.
I read fluent user guid. in user guid just describe the method for writing prof file.

now I have another question.
where can I write profile file or which software can I use to write profile file.?

[raminostadi]

thank you Vasava
I have 2 problem with curve fitting
1- my boundry condition is similar to sine function not exact sine function.
2- curve fitting isn't a exact method
therefor I want to use points as a .prof file but I don't know where can I write this format for importing to fluent?
can any body help me?

[vasava]

Originally Posted by raminostadi

where can I write profile file or which software can I use to write profile file.?

You can write your own matlab or C program to generate a .prof file. You just have to make sure that the data (coordinates, velocity, pressure etc.) appears in a particular format. After all its just a text file with numbers.

Here is a template of the .prof file.

((outlet point 2210)
(x
x1
x2
.
.
.
)
(y
y1
y2
.
.
.
)
(z
z1
z2
.
.
.
)
(velocity-magnitude
v1
v2
.
.
.
)
)

I think right now you don't realize that

1. .prof file has only one profile (E.g. fully developed turbulent flow profile).
2. The profile in the .prof file does not update with time. It is just one profile that remains same irrespective of time and iteration.
3. Because of points 1 and 2, you can not implement time-dependent boundary conditions with .prof file.

If you have found a fluent tutorial or fluent guide that says otherwise, I would like to have a look and learn more.