Re: [Libmesh-users] Interpolation order

[Manav B. <bha...@gm...>]

Thanks David, this is helpful.

I have a related question:

L2_LAGRANGE provides the *discontinuous* interpolation using Lagrange
polynomials, so I could use a quad4 and have as high as third order
(currently, and I will be glad to contribute more). However, is there a way
to achieve the same order of *C0 continuous* Lagrange interpolation on
quad4. This would require that the node and edge dofs be consolidated
between elements.

I would appreciate your comments.

Thanks,
Manav




On 02/21/2013 10:55 AM, Manav Bhatia wrote: > Hi,> > I am curious if the
library allows for use of Lagrange elements in C0 > discontinuous
interpolation. We have L2_LAGRANGE basis functions, which are the same as
the LAGRANGE basis functions but where dofs are associated with elements
rather than the nodes, and hence can be discontinuous (hence the "L2"
naming). I guess this is what you're asking about? > Also, is it allowed to
have an Lagrange > interpolation of an order that is higher than the
geometry order? For > example, can I use a 4th order Lagrange interpolation
on a quad4? You can do this with L2_LAGRANGE, though I think L2_LAGRANGE
currently only goes up to third order (a patch that allows higher order
would be welcome!) David