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wateraction September 7, 2011 05:09

Fluent_PostProcessing_Point surface creation
Hi, here is my problem,
I want to create a series of points on a certain surface in my model in fluent postprocessing, so that I can see the velocity data on these points. Firstly, I created a point named x1y1, then I wanted to use the surface transform to create the next point named x1y2 which is 200mm offset to the first point in the y-direction. But when I did it, it turned out a failure with a message "error object".
Therefore, I wonder if it is not allowed to create points using "surface transform" in fluent postprocessing, unlike creating surfaces in that way, or is it because my fluent version 6.3.26 is not high enough?
Thank you!

ronaldalau September 8, 2011 11:59

When I want to make a bunch of point surfaces, I use excel, like this:

surf point-surf pt_1-02 1.269 0.610 22.000
surf point-surf pt_1-04 1.269 1.219 22.000
surf point-surf pt_1-06 1.269 1.829 22.000
surf point-surf pt_1-08 1.269 2.439 22.000
surf point-surf pt_1-10 1.270 3.049 22.000
surf point-surf pt_2-02 3.708 0.610 22.000

Then I select the cells, copy, and paste into the TUI.
Just make sure that the units used in the excel file are the same as the length unit set in fluent.


wateraction September 15, 2011 06:24

Thank you, ronaldalau
Hi, ronaldalau, thank you very much for sharing your knowledge and valueable experience!
I've used your method and it worked very well.
I should say it's a huge help for me and would save me a lot of time!
I hope I could see your reply earlier so that I could avoid the tough work of typing (x,y,z) value for all 100 points.
However, the method is still pretty for my later on work.
I really appreciated it!:)

ronaldalau September 19, 2011 10:33

This works with b.c. entry as well.

Rizou September 19, 2011 14:55

plot of cp distibution across a 3D airfoil at any given location
Hi all

Plz can anybody tell me how can I get a plot of Cp distribution across a 3D aifoil at given location in fluent.

thanks in advance

wateraction September 25, 2011 22:32


Originally Posted by Rizou (Post 324731)
Hi all

Plz can anybody tell me how can I get a plot of Cp distribution across a 3D aifoil at given location in fluent.

thanks in advance

Hi, Rizou,
I'm not familiar with the plot function in fluent, but I can tell you how to get the Cp value of given locations.

First you should know the (x,y,z) value of each given location across the airfoil. Then create points for these given locations by the format below in the txt command line in fluent(for example, there are totally 9 points named p1,p2....p9, with each coordinates value as (x1,y1,z1) to (x9,y9,z9)):

surf point-surf p1 x1 y1 z1
surf point-surf p2 x2 y2 z2
surf point-surf p9 x9 y9 z9

the you can write a profile by clicking "file-->write-->profile...", choose these created points on the left frame, choose Cp on the right frame, and select a route to save it.
The profile can be opened by Excel, and these Cp value and points information could be shown and then be processed as you wish.

Good luck!:)

Rizou September 28, 2011 13:51

Hi wateraction

Thank you so much for your help, it worked.
I have another question plz; I want to compare my CFD results with experimental data. So Does anybody have an idea where i can find experimental data for cp for NREL phase IV aifoil?

thanks a lot

mdsvjpk October 3, 2011 05:22

i am getting zeros values when i tried to locate the velocities on a certain surface if i deactivate the node value option then i am getting some values but i am sure its not correct can u pls help me how to resolve this problem
thanks in advance

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