Learning Forum

[pblasiak]

Hi

I have a cylinder1 with outer diameter of 28 mm and inner diameter of 26 mm.

It is connected with a cylinder2 of diameter 28 mm at the thin surface (it is named cyl1_cyl2_interface) marked below (Fig1).

 

I changed the diameters of cylinider1 into 15 and 13 mm.

Then I changed the diamater of the curve at the cylinder2 into 13 mm using Pull->Pivot.

Next I changed outer diameter of cylinder2 into 15 mm using Pull.

 

The problem is that when I go back to Meshing, named selection of the cyl1_cyl2_interface is missed.

What do I do wrong? I tried also copy and extrude curve using Pull but it does not work.

 

best regards

[Rob]

When you change the sizes and reshare topology I suspect that face is either removed or remade so it's not so much lost the named selection as not been labelled. 

[pblasiak]

Yes it disapears and meshing does not recognize that surface.

However, it is strange that this surface is deleted with pull->pivot becausa I only change diameters, not deleting.

Is it possible to preserve named selections?

[Rob]

Not exactly. When you change the sizes the cylinders are no longer touching, so there is no contact face. Then you change the second cylinder re-making the contact face. 

[pblasiak]

I did it but it does not work.

Here is explanation what I have done:

 

1.        1. Pivot Edge up to inner cylinder face

[pblasiak]

I did it but it does not work.

Here is explanation what I have done:

 

1.        1. Pivot Edge up to inner cylinder face

[RK]

Hello, 

For a named selection, it is best to use named selection via face id. That way, even if you change the dimensions, the face will still be recognized. 

[pblasiak]

How can I do this? What is named selection via face id?

[RK]

You can do it through the script editor. Click on the "Insert Selection" dropdown menu and choose index. Now select the face and add it to a named selection, So, this way, the face is recognized by it's id 

[peteroznewman]

When you use the Pull tool, make sure No Merge is selected on the Options. The default is Merge and that may be why you lose the face and the associated Named Selection.

[pblasiak]

I applied No merge

[Keyur Kanade]

can you please check that after changing geometry diameter that orange face still exist.

from images it looks like when you reduce diameter that orange face face disappears as it is out of range of diameter. 

Regards,

Keyur

 

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[pblasiak]

Yes it still exists:

[Keyur Kanade]

I think I misunderstood it. Can you please explain with clear pictures with some arrows and some annotations. 

 

[pblasiak]

Maybe this short movie will explain it better:

http://fluid.itcmp.pwr.wroc.pl/~pblasiak/download/spaceclaim.mp4

[Keyur Kanade]

As ANSYS Staff, we can not download attachments. Please insert images using insert image functionality. 

Pleas insert more clear images with some arrows to describe it. 

Regards,

Keyur

 

If this helps, please mark this post as 'Is Solution' to help others.

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