Conical hole within a layer Log Out | Topics | Search
Moderators | Register | Edit Profile

FlexPDE User's Forum » User Postings » Conical hole within a layer « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Sabine Blatt (sblatt)
New member
Username: sblatt

Post Number: 1
Registered: 09-2005
Posted on Tuesday, September 20, 2005 - 05:29 am:   

Hi

I'm a new user and I could do with some help regarding the construction of my model.

I'm trying to define a 3d structure with an upper and lower volume (rectangular layers, Lx=Ly, z=h1) divided be a third layer with in reality corresponds to a membrane. This rectangular membrane (Lx=Ly, z=h2) has conically shaped holes inside (R1,R2). I managed to get a cylindrical hole by using the extrusion command but didn't succeed with a cone...

I would be glad for any help on this!

Thanks,
Sabine
Top of pagePrevious messageNext messageBottom of page Link to this message

Sabine Blatt (sblatt)
New member
Username: sblatt

Post Number: 2
Registered: 09-2005
Posted on Tuesday, September 20, 2005 - 06:49 am:   

I just realized ReChang asked a very similar question only two days ago.
Still in my case it's not the question of how to build the cone, but how to link the cone to the membrane layer.

To make things clear the attached file shows one quarter of a cylindrical hole (I'm limited to the students version).
application/octet-streamquarter of a 3d hole inside a layer
3d_quarterhole.pde (1.6 k)
Top of pagePrevious messageNext messageBottom of page Link to this message

Robert G. Nelson (rgnelson)
Moderator
Username: rgnelson

Post Number: 461
Registered: 06-2003
Posted on Tuesday, September 20, 2005 - 04:16 pm:   

"Sidewalls", as you have used, must be vertical extrusions, and cannot be tapered.

To make a conical hole, you must shape one of the dividing surfaces as a cone, and bring it up or down to merge with the adjoining surface over the center of the hole.

See the attached script and graphic.
application/octet-stream
3d_quarterhole.pde (1.8 k)

Top of pagePrevious messageNext messageBottom of page Link to this message

Sabine Blatt (sblatt)
Junior Member
Username: sblatt

Post Number: 3
Registered: 09-2005
Posted on Wednesday, September 21, 2005 - 07:32 am:   

Hi there

thank you for your help!
I had tried to do something similar, i.e. shape the wall as a cone but I didn't manage to define an appropriate "limited region". Does this formalism also work in the case of e.g. a double conical hole? Or is this rather a question a finding the right equation for zbottom?

Thanks again
Sabine
Top of pagePrevious messageNext messageBottom of page Link to this message

Sabine Blatt (sblatt)
Member
Username: sblatt

Post Number: 4
Registered: 09-2005
Posted on Wednesday, September 21, 2005 - 08:35 am:   

Ok, I answered that question to myself already :-)

Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Last Week | Tree View | Search | Help/Instructions | Program Credits Administration