Hi Abhishek,
These define the various choice of basis functions; the first is the modified C^0 basis that's defined in Karniadakis & Sherwin. The other two are Lagrange basis functions: the first is a choice with the number of quadrature points as one higher than the number of points; the other is where they are equal (i.e. the collocated basis with diagonal mass matrix).
I believe all of those basis functions should work fine for 2D elements. For 3D, Lagrange only presently works for hex elements, whereas the C^0 has full support for hex/tet/prism/pyramid.
Hope that helps,
Dave
> On 1 Feb 2018, at 17:42, Abhishek Kumar <abhishek.kir@gmail.com> wrote:
>
> Dear friends,
>
> I am new to NEKTAR++.
>
> Can someone tell me the difference between MODIFIED, GLL_LAGRANGE, GLL_LAGRANGE_SEM expansions type?
>
>
> With regards
> Abhishek Kumar
>
> ------------------------------------------------------------ ---------------------------
> Abhishek Kumar
> Post Doctoral Researcher
> Applied Mathematics Research Centre
> Coventry University, Coventry CV15FB
> The United Kingdom
>
> Email # ac7600@coventry.ac.uk, abhishek.kir@gmail.com
> ------------------------------------------------------------ ---------------------------
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