[Bdew8556]

Hey guys,

Finally got my blade curves right and they finish at the same point.

The merinodial curves are fine and im towards the end of the data import but this is what I get after I like Edit curves.

Hmmm wont let me load the picture.

Basically its joined the leading edge of all my curves together.

Any thoughts?

[-Maxim-]

I don't use BladeGen so I'm afraid I can't help you here.
I think it would help others if you tried again to upload a picture of the problem. Upload it to postimg.org or so and post the link here.

Since you are using the 'wizard' (which is certainly a good start) maybe you could try the manual method? I don't know what that wizard does exactly but usually there's a way to do all those steps manually. You might need to read up in the documentation though
Good luck

[Bdew8556]

Hey Maxim,

Thanks for that:

https://postimg.org/image/v8qgag38n/

I've got all the x,y,z points for a hub, shroud and blade im trying to analyse so im more or less trying to import this geometry.

The design modeller wasnt giving me much joy so I figured I would make my own blade gen files using those points and import the geometry that way, to no avail thus far however.....

[Bdew8556]

Hi all,

I ended up using Bezier curves to import the geometry.

If you know the x,y,z co ordinates or your blades you can transform that into a theta vs Merinodal length graph. Pick 6 or so points on that and use them as your Bezier anchor points. The curves should then look pretty much identical.

Does anyone know what this message means?:

TurboGrid Application Error

Application Error in TurboGrid: ERROR
An error was thrown while generating the span geometry for Topology.
This probably means the selected topology is not appropriate. Details are given below:
V value outside ot its bounds. Value =-0.549374

Brett

[-Maxim-]

I had this error before. If I remember correctly, a little part of the leading or trailing edge was outside of the defined domain (inlet/outlet/hub/shroud). I set the inlet or outlet further up or downstream which fixed that.

But the error message mentions the topology. Which topology did you select? Depending on your blade geometry, another topology might be better. I had to use "Single Round Round Refined" for example to get a better topology for my case.

Good luck

[Bdew8556]

I'm actually not sure how to change the Topology.

Would not having a tip gap between the blade and shroud effect it?

I think there is a way to insert a tip gap without having to go and change the whole blade profiles?

[-Maxim-]

you can add a tip gap under "Blade Set" --> Shroud Tip

Topology can be changed under "Topology Set" --> ATM Topology - Method. TurboGrid limits the selection there according to your blade profiles I think. With the choice of "Manual" you have more options.

[Bdew8556]

Ah yep.

I just saw the tip gap option there.

I think there is a difference how you move forward from bladegen.

For example I went from bladegen, right click, transfer data to new turbomachinery fluid flow. In the design modeller i didnt have the exported points or the flow path.

Next I went blade gen, create new geometry, i manually added the export points, then transfer data to new turbomachinery fluid flow. Now the topology options you mentioned exist. This is a bit funny....

Lots to think about it seems.

By the way this is my linkedin:


https://www.linkedin.com/in/brett-de...ve_tab_profile

[Bdew8556]

Have you got any tips for boundary conditions settings?

https://s32.postimg.org/84sfbe5md/BCs.png

[Ahmed Saeed Mansour]

What are the R and Z refer to? Please

[Bdew8556]

R is radius and Z is axial length. Turbomachinery geometry is very complex. In some cases geometry is described in your usual X,Y,Z plane, in other cases R, Theta and M. M being the merinodal distance or inlet to outlet.

[Ahmed Saeed Mansour]

Thank you very much...You are right...very complex!

[Ahmed Saeed Mansour]

Can you please tell me about the required angles here in Vista CPD? or any reference?

[ilcapitano]

hi everyone
i have an error in bladegen, when i input my data's for axial turbine in normal axial mode and enter to the 3 view area, the program give me a warning:
exception caught
''search failure #1 in makeLE''
can anyone explain to me what can i do?

[Ahmed Saeed Mansour]

Originally Posted by ilcapitano

hi everyone
i have an error in bladegen, when i input my data's for axial turbine in normal axial mode and enter to the 3 view area, the program give me a warning:
exception caught
''search failure #1 in makeLE''
can anyone explain to me what can i do?

Dear ilcapitano, try to find out this part in the manual of vista to know what you should input...The manual includes a lot of useful information that will avoid any error. Unfortunately, people who are experts in this software are few!