Can FlexPDE model a 3D CONE?

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Author Message   Rui Shao (wysiwyg) New member Username: wysiwyg Post Number: 1 Registered: 09-2004 Posted on Thursday, September 23, 2004 - 02:29 pm:    I'm a novice user. Just trying to model a boundary -- a cone shape and the tip of the cone is actually a small half sphere. Greatly appreciate someone telling me if it's doable by this software.   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 222 Registered: 06-2003 Posted on Friday, September 24, 2004 - 01:44 am:    Modeling a cone is quite simple. Just define the surface z=H-r. Putting the ball at the end is just a little bit more work. The attached file assumes you want a ball tangent to the cone face. If you really want a hemisphere, you can change the definitions. Another kind of cone is also attached. Ball-tipped cone ballcone.pde (0.8 k) 3d_coctail.pde (0.8 k)   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 223 Registered: 06-2003 Posted on Friday, September 24, 2004 - 01:48 am:    PS You could instead use LIMITED REGION 2 z1=zball surface 2 ...etc if you dont need the regions separated in the body of the cone.   Rui Shao (wysiwyg) New member Username: wysiwyg Post Number: 2 Registered: 09-2004 Posted on Friday, September 24, 2004 - 09:34 am:    Many thanks. This is really helpful.   Alex Dert (alexdert) New member Username: alexdert Post Number: 1 Registered: 02-2007 Posted on Thursday, February 15, 2007 - 07:53 am:    Many thanks too. This is really helpful.   patrick exshaw (pat) New member Username: pat Post Number: 1 Registered: 06-2009 Posted on Sunday, June 28, 2009 - 08:56 am:    I am a novice user too..and I would like to insert a cone in an other one..the first one has to be void..I manage to do it with a cylinder but it does not work with a cone ..Can you help me?   Marek Nelson (mgnelson) Moderator Username: mgnelson Post Number: 128 Registered: 07-2007 Posted on Sunday, June 28, 2009 - 07:53 pm:    The easiest thing to do is take the cocktail glass from above and remove the stem and base. I have also modified the above "ballcone" script to make a conical "sleeve" (two nested cones with the innermost void.) Several variants are attached here. In general, it is necessary to cut the tip of the cone at some finite size, otherwise you may encounter gridding difficulties (this is because the curvature at the tip goes infinite.) I was able to create one script here that does grid to the tip but it is not always achievable. cones0.pde (0.8 k) cones1.pde (0.9 k) cones2.pde (1.2 k)   Marek Nelson (mgnelson) Moderator Username: mgnelson Post Number: 131 Registered: 07-2007 Posted on Tuesday, June 30, 2009 - 01:24 pm:    See also http://www.pdesolutions.com/discus/messages/4/10480.html