[aja1345]

Hi,

I designed the following turbine model and also, Model attached in following link.

http://www.4shared.com/file/gQXfTcPxba/Subtract.html

Why not subtract the volume 2 of volume 1?

I have this message:

ERROR: ACIS error 8030 : inconsistent face-body relationships
Restoring the geometric model to the state before the current
operation (if there is a positive number of default UNDO levels).

Thanks

Best,

Amir

[aja1345]

No one help?

[-mAx-]

cannot download your file from the office

[aja1345]

........

......

[-mAx-]

nope
try to zip it, and attach it directly in your post (with attachment option)

[aja1345]

Hi,

.................

[-mAx-]

you cannot substract volume 2 from volume 1 since volume 2 isn't fully included in volume 1

[aja1345]

Originally Posted by -mAx-

you cannot substract volume 2 from volume 1 since volume 2 isn't fully included in volume 1

Thank max for your answer

But I think that volume 2 is within volume 1, I designed this model in Solidwork and It imported in Gambit.

Can you tell why volume 2 isn't fully included in volume 1? While, Volume 2 is within the volume1.



According to the following figure, Volume2 is fully within volume 1. Therefore, It could be subtract volume2 of volume1.

I am grateful that guide me more.

[-mAx-]

yes you're right, I checked to quickly ; sorry

So in your case, you need to do following:
* copy face.10 with (0 0 10)
* copy face.7 with (0 0 -10)
* delete volume.2 (enable lower geometry option)
* join both trailing edge with an edge
* join both leading edge with an edge
* create extrado surface from curve
* create intrado surface from curve
* create new airfoil volume with 4 surfaces
* split volume 1 with this new volume
*delete both volume outside from your volume 1, and the airfoil
That's it
Untitled.png

[aja1345]

Thanks,

I didnt designed this model according to your way and also, I dont want to create any new airfoil. In fact, I used Naca 0020 profile for this design. Up surface of blade and down surface of blade are Naca0020 profile.

I want to subtract this model that attached,But How? What is the problem? when volume 2 is within the volume 1, So It should be subtract volume 2 of volume 1. But why not be?

Can you subtract this model that I attached?

Best.

Amir

[aja1345]

Hi max

You said about extrado and intrado surface in post#9. What does your mean?

I am grateful that answer this question and before questions.

Thanks.

Best.

Amir

[-mAx-]

I think it is a tolerance issue, since your faces 10 and 7 are close from surface 5 and 6.
For instance if you enforce the manual tolerance in the substrac tool (1e-3) it will work.

For intrados and extrados, I meant lower and upper surface of airfoil (I thought those terms were also english)

[aja1345]

Thanks max

Does this issue make a lot of error of computational?

[-mAx-]

no this is just a geometric tolerance