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September 7, 2011, 05:09 
Fluent_PostProcessing_Point surface creation

#1 
New Member
Joe
Join Date: Mar 2009
Posts: 26
Rep Power: 9 
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 ydirection. 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! 

September 8, 2011, 11:59 

#2 
Member

When I want to make a bunch of point surfaces, I use excel, like this:
surf pointsurf pt_102 1.269 0.610 22.000 surf pointsurf pt_104 1.269 1.219 22.000 surf pointsurf pt_106 1.269 1.829 22.000 surf pointsurf pt_108 1.269 2.439 22.000 surf pointsurf pt_110 1.270 3.049 22.000 surf pointsurf pt_202 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. Cheers. 

September 15, 2011, 06:24 
Thank you, ronaldalau

#3 
New Member
Joe
Join Date: Mar 2009
Posts: 26
Rep Power: 9 
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! 

September 19, 2011, 10:33 

#4 
Member

This works with b.c. entry as well.
Cheers, R. 

September 19, 2011, 14:55 
plot of cp distibution across a 3D airfoil at any given location

#5 
New Member
Join Date: Apr 2011
Posts: 2
Rep Power: 0 
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 

September 25, 2011, 22:32 

#6  
New Member
Joe
Join Date: Mar 2009
Posts: 26
Rep Power: 9 
Quote:
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 pointsurf p1 x1 y1 z1 surf pointsurf p2 x2 y2 z2 ..... surf pointsurf 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! 

September 28, 2011, 13:51 

#7 
New Member
Join Date: Apr 2011
Posts: 2
Rep Power: 0 
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 

October 3, 2011, 05:22 

#8 
New Member
koteswari
Join Date: Mar 2011
Posts: 14
Rep Power: 7 
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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