Secondary Flow/Vortex Analysis in Streamcut Plane

The figure you shared is the contour plot of the relative Mach number on some plane, and the streamlines are imposed on the cutting plane. In Figure 2, vortexes, namely A and B, are shown. The turning of streamlines shows the presence of the vortex near the hub and shroud region of the blade. To create such a contour, you first need to create a cutting plane and then create the streamlines on the plane.

 For further analysis of such a pattern, you may follow the papers shown below:

 Dallmann, U., “Topological Structure of Three-Dimensional Flow Separation,” DFVLR-IB221-82 A07. Gottingen, Germany, (1983).

 Effect of Tip Clearance on Flow Field and Heat Transfer Characteristics in a Large Meridional Expansion Turbine.

by Fusheng Meng, Qun Zheng, Jie Gao * and Weiliang Fu

The q-criteria and lambda-criteria tools are used to analyze the 3D vortical structures.

Please go to the Fine/Turbo User guide, where you can easily find the method for creating the cutting plane and streamlines. Otherwise, you can try running the Tutorial 1 of Fine/Turbo, Axial compressor Rotor37.

Thank you for your response. Yes, I am aware of the process to do streamwise cut planes and plot quantities on it but haven't been able to plot 2D streamlines on those planes. I can do regular streamlines through streamwise sections but they tend to extrude out of the plane(which makes sense). I also looked at tutorials and they do have isolines and b2b vector lines plots but not streamlines. I checked user guide too and found regular streamlines section but couldn't locate the specific section for 2D streamlines on streamwise cut planes. It would be helpful if you could direct me to the part where it is discussed.

thanks!

Hello! To display 2D streamlines, please have a look at this section of the user manual:

Cfview > User Guide > Flow Quantities Visualization > Visualize Vector Data > Vector Lines Parameters

The trick is to go to the streamline property window and switch the mode from "volume" to "surface".

Thanks for the info. I tried doing that for my case with plane just downstream of rotorTE. I tried plotting vector lines for both 'Vxyz' and 'Wxyz' using "Vector lines from section"  but am getting something like this (figure attached) which is very different from what I am expecting as shown in the orginal post. Please let me know if I am missing something here.

Thanks for the info. I tried doing that for my case with plane just downstream of rotorTE. I tried plotting vector lines for both 'Vxyz' and 'Wxyz' using "Vector lines from section"  but am getting something like this (figure attached) which is very different from what I am expecting as shown in the orginal post. Please let me know if I am missing something here.

For a rotor, I would use the surface streamlines of relative velocity. I gave it a try on my side. Plotted below is a color contour of relative Mach number on a cutting plane going through the rotor blade, superimposed with surface streamlines of Wxyz (in black). I also added volume streamlines (colored) of Wxyz, showing the vortices at specific locations.

Hi, thanks for getting back. Yes this indeed looks like what I want. Yes I am also doing Wxyz and surface type but I am still gettting straighter lines as shown in the figure I listed before. When plotting vector lines, are you using 'Vector lines from section' option? Can you please briefly list the steps and settings you used?. Maybe if you could do one for a common case like 'rotor37 tutorial case' that would be great so I can try to replicate.

Here are the steps:

- Select the cutting plane of interest (right-click on the plane in the list -> Select)

- Select Wxyz in the list of quantities

- Go to the "vector lines parameters" window and select "mode=surface", "direction=both"

- Select vector lines from section

- left-click somewhere on your cutting plane and drag the cursor somewhere else on the cutting plane. By default, it will seed 5 streamlines between the two selected points. You can repeat a couple of times to add enough streamlines on your plane. 

If you are still having issues, please contact our customer's support directly and we will troubleshoot on your specific case. Thanks!

Awesome! Thanks. I will try this and if not will contact support.