[CFD_Newby]

Hello together,

with the IGG file, it is possible to get the coordinates of the model.
But in Numeca, it is necessary, that a blade (e.g.) has to extend the hub and shroud curve. During the meshing process you have to enter a tip gap and as a result you get the "real" geometry of the blade.
Is it possible to get these coordinates (from hub to tip containing the gap) for eample in CFView?

Greetings
Peter

[DarylMusashi]

Dear Peter,
there are several ways to obtain this distance: CFView, IGG or AutoGrid. Did you know there is a distance tool in AutoGrid (top bar, tools, distance)? Secondly, when hovering with your mouse over a curve the coordinates are given out in the lower bottom line of the GUI in AutoGrid. So you can easily get the hub and shroud coordinates at a desired location. If I got you wrong maybe you can share a screenshot what you exactly want to measure.

Kind regards
Holger

[CFD_Newby]

Thanks Holger for you help. Yes I knew the distance tool in IGG. But this is dependant of the mouse position.
If I want to get the coordinates of the trailing and leading edge of a blade in CFView for example (as you can see attached), how can I export these coordinates?
Of course the coordinates are shown, if you browse over the curve, but how can I be sure, that I picked the highest point of the trailing or leading edge, do you know what I mean?

Greetings.

[DarylMusashi]

Dear Peter,
yes I understand. Obtaining the coordinates of Leading and Trailing Edge can be done this way in IGG for instance.

In IGG please import the geomTurbo file of your mesh (File -> Import -> geomturbo). If your Leading or Trailing Edge is a straight line
this curve has only two control points. If you are interested in the coordinates of that curve between start and end you can convert this line to a c-spline with a defined number of control points: Please select the Leading or Trailing Edge and convert it to a C-Spline (Geometry -> Edit -> Convert to C-Spline). Please follow the steps in the lower part of the GUI. In case of a straight line you must define the number of control points, don't choose "automatic", since this would result in a c-spline, which also has only two control points (start and end point). After you have converted this line please select it. To do this unselect all curves, press Strg-C (curve list) and select the entry at the end of the list, press Apply. Then go to File -> Export -> Geometry Control Points to export the XYZ coordinates of all control points of the marked curve to a .dat file, which can be opened with a text editor.
Alternatively, you can add additional control points to the original curve (Geometry -> Modify Curve -> Add Control Point). Please proceed to export this curve coordinates as described above.

Please keep in mind that the geomTurbo file contains the blade, which intersects with the channel. When I understood you correctly you want to get the maximum radial position of the Leading Egde of the real blade. One way would be to open the mesh in IGG, select to gap block on the top of the blade and create curves from the block boundaries (1x horizontal, 1x vertical edge). Please select the edge, right-click, edge -> create curve. Once you have created two lines with a common point please select both curves and use Geometry -> Create Points -> Curve-Curve intersection to create a cartesian point at the intersection. The XYZ coordinates of that point can be transferred to RZ coordinates, as R=SQRT(X^2 + Y^2). This is the maximum radius of your blade where the tip gap begins.

Please take note that this procedure is only valid if the tip gap height is constant from leading to trailing edge.


Kind regards,
Holger

[CFD_Newby]

It's more complicated than I thought.
With your descripted way I get the max. radial position. And with the coordinates of the geomturbo file I have the hub positions of the leading and trailing edge, right. I'll try this, thank you.

What about a plot of a quantity along a boundary section as attached? So I get the values along all boundaries, I just have to delete the unappealing values. Could this be another way as well?

Greetings
Peter

[DarylMusashi]

Yes - that works, too (as you can export the curves to get the exact values).

[CFD_Newby]

I got the coordinates of the tip with your descripted way (curve curve intersection), thanks again.
What about the hub coordinates at leading and trailing edge? As you can see attached, there is no leading edge to select, to get the coordinates in the same way. Do you have an idea, how to get them?

Greetings

[DarylMusashi]

Dear Peter,

in the opened .igg mesh file you can load in other components, for example the geomTurbo file which contains the leading and trailing edges (File -> Import -> geomTurbo).

Kind regards
Holger