precision - examine geometry

[Hope]

Bye to all,

to do a cfd analysis we had to remove from a very large cylinder (which represents the fluid) of very small components. geometry was not created with nx. the analyst asks, however, that the geometry is analyzed with the examine geometry of nx10, making all test of consistency etc.

what I noticed is that if I redefine the size of the cylinder very large above, the geometry passes all the check, if instead the increase, gives me some consistency errors and tells me that the part could be corrupted.

I'm almost sure there is a logical explanation to all of this, perhaps a limit between the relationship between the larger and smaller size in a model, precision etc. but I ask you, there is a valid explanation and perhaps a solution?

Thank you all.

 

[Hope]

I forgot, sometimes, trying to make the examine geometry with the very large cylinder, nx gave me a series of errors, including run-time error.

 

[ceschi1959]

Hi, I don't have nx underhand because I'm on vacation. In preferences or customer defaults, I don't remember well, there should be a field that limits the work volume. Probably that's what breaks the boxes. How big is the cylinder?
However if the examine geometry doesn't give you problems with a smaller cylinder I would go quietly.
Let us know?

 

[ceschi1959]

p.s. in the forum nx design forum American, talk about a cube... why?

 

[Hope]

hi baskets, thanks for the super timely answer. the cylinder has a diameter about 3000mm and the size of the smaller geometries that subraggo are about 0.5mm. in English I prefer not to give info, while in the Italian forum I can give some extra information. Then, put the laziness on it, as it's midnight here. Thank you very much anyway, I try to find the setting you're talking about and let you know.

 

[ceschi1959]

3000 mm fall widely unless it is out of the max volume. It happened to me when a 1:1 scale turbine was studied.
to see if there are problems I use the dichotomic procedure: cut (trim) in two the solid, examine one part, if it does not give problems, reverse the trim and verify the other and so on.

 

[Hope]

hi baskets, in the end I solved importing the geometries with which I made the cut as parasolid instead of step. the 3d passes the examine geometry and it is also improved the speed with which nx loads the geometry. Thanks again for the support!

 

[ceschi1959]

thanks to you feedback. ?