[khleitz]

I am just starting with OpenFOAM and can't manage to
display the streamline plots as discribed in the User Manual on page U-31.
I use the Stream Tracer Filter as said in the manual but afterwards I can't choose the Tubes Filter. It is grey in the Filter Menue and can't be choosen.
Can anyone tell me what I am doing wrong?

[rmorgans]

Hi Karl-Heinz,

Here's a solution, and some other advice from one of our summer students reports (Felicia Tristanto).

Running Tutorials
It is recommended that the new user work through the tutorials in Chapter 2 of the OpenFOAM User Guide, then the example cases in Chapter 3 of the Programmer's Guide for more advanced examples. Please note there are some errors and inconsistencies in the tutorials in the User Guide. These errors are listed below:

1. Page U-31, Section 2.1.4.3, plotting streamlines. The trick is to select Extract Parts in Filter Utilities first, then choose Internal flows only in the Parameter Tabs. Ensure volPointInterpolate(U) is chosen in both cavity.foam and extract parts Display tab and click Accept. The instructions written in the second paragraph then can be followed.

2. Page U-36, Section 2.1.5.7, last paragraph. To use this Probe menu, the user has to Extract Parts as described above.

3. Page U-44, Section 2.1.10. The one paragraph in this section is a little misleading. It is true that the velocity graph can be generated at a specified time, yet the method described in this paragraph is very vague. To generate a velocity vector at a specified time, select the desired time from cavity.foam. Then create a dummy.foam file using the touch command and open. Select Cell Centers from the Filter utility menu, then click Accept.

Hope this helps

Cheers

Rick

[hjasak]

Ages ago I have written a utility to calculate streamlines as a point-based field. If your mesh is 2-D (i.e. stream function is defined properly), run streamFunction and visualise iso-lines on a point field - I think it's called "stream". Should be obvious anyway...

Hrv

[rmorgans]

Hi Karl-Heinz,

You should also check out the 1.4 documentation, the above comments have been fixed.

http://www.opencfd.co.uk/openfoam/do...5-170002.1.4.3

Cheers

Rick

[wolle1982]

Hello,

if you have a 2D problem (e.g. an airfoil) you have to "Filter>Extract Parts" extract the frontpatch. Make a "filter>straem Tracer" of this. This will do. Showing the airfoil itself you might use another Extract Parts of the Airfoil-Patch. Show it by using "wireframe Displaying".

[zhoubinwx]

Hello,

About the stream line, I could see that when using the test case about the uniform flow over a half cylinder in the directory tutorial/potentialFoam, when we set the streamlines using a sampling line:
1. at the inlet;
2. in the middle

For this two conditions, we will get different stream lines. And the stream line cross each other just above the cylinder.

BTW, wish all of you, especially Prof. Jasak a good new year.

Bin

[Hussam]

Dear Sir
My name is Hussam Ali Khalaf, postgraduate student in Iraq and Am currently working on “A Solution Algorithm for Transient Fluid Flow with Multiple Free Boundaries”
I have results for velocities values (u and v) in directions x and y for undular bore evolution (please, note the file attachment), rectangular uniform mesh (2Dimension, (i,j)=(22,10)) consists of 20 cells in the horizontal direction (length=12 , ∆x=0.6) and 8 cells in the vertical direction (height=1.6, ∆y=0.2).
Am supposed to draw velocity vector, streamline and stream function. I have a program TecPLOT, I have tried several times but I don’t fully understand how TecPLOT reads the results, would you please help me if you have any idea on how to go about it.
Thank in advance

Yours sincerely
Hussam Ali Khalaf
Iraq