Learning Forum

[sumansapkota]

Hello all,

 

Anyone who has meshed centrifugal rotating machine with inflation layers around hub, shroud and blade? 

I have 1/4th domain of a centrifugal impeller.

I can either inflate hub and shroud OR, I can only inflate the layer around Blade. How do I do it for all three Blade, Hub and Shroud? The program does not show any error and it is difficult to comprehend what might go wrong. Is it because the inflation layers around blade and the collide? If so, how do i get over this problem?

Figures below shows the (1) Failed inflation layer on blade and shroud (2) Settings used for the meshing (3) Failed Inflation layer on the hub,shroud and blade.

The inflation layer on the blade at the shroud surface DISAPPEARS without any error message. I can still view the inflation on the blade near the hub side. 

 

 If I put inflation layer on all hub,shroud and blade. Then, the inflation layer in visible on the hub and shroud BUT NOT THE BLADE. (Figure 3).

 

Please help.

 

 

[Rob]

If all of the outer faces are inflated you'll not see any inflation imprint as the layers remain inside the fluid. How does it look with a section plane?

[sumansapkota]

Hello Rwoolhu,

 

Thank you for the response, as always. Yes, I do see it on the section plane. Strange that I do not see the inflation on the faces. Will this affect my solution?What does your experience say?

(On second note: I might have to do a sensitivity test)

 

. 

[Rob]

You're not seeing inflation on the faces because the inflation is internal at the corner: the inflation layers connect inside the volume (as above towards the right) rather than being projected onto & terminating on a face (like on the left side of the image). 

It may alter the solution: that's down to mesh resolution etc. Hard to say in this case, but the mesh does look coarse. Bear in mind I run 5-10M cells routinely and 30+M isn't unusual. You're using the free version and have limits.