using orderinner with H1 space

Hello,

I saw in this example that it is possible to set orderinner=0 on HDiv spaces:
ngsolve.org/docu/nightly/i-tutorials/uni...der/fourthorder.html

I tried setting orderinner=0 on an H1 space, but I get the error message:

WARNING: kwarg 'orderinner' is an undocumented flags option for class <class 'ngsolve.comp.H1'>, maybe there is a typo?

I was wondering if there may be a different way to remove the inner basisfunctions of H1?

Thanks,
Sander

Hi Sander,

Although it is undocumented, "orderinner" for H1 should work as well.

As in 2.6 Stokes equation, you can set the order for node-types:

V = H1(mesh, order=2, dirichlet="wall|inlet|cyl")
V.SetOrder(TRIG,3)

With V.SetOrder(TRIG,1) you disable the interior bubbles for triangular elements in 2D , and triangular faces in 3D.

To see what you get you can explore the dofs of elements and nodes, see the tutorial here:

ngsolve.org/docu/latest/i-tutorials/unit...ntId-and-Ngs_Element

Best,
Joachim

Hi Joachim,

Thanks for the response. So both

and

should give the same result and I can just ignore the warning

WARNING: kwarg 'orderinner' is an undocumented flags option for class <class 'ngsolve.comp.H1'>, maybe there is a typo?

A follow up question, if I explore the dofs using

I find whether I use or , the same dofs are printed to screen. Is it correct to assume that although the dofs for are printed to screen, they are not actually used?

Thanks,
Sander

you get a difference if you set
or higher.

H1 - trig-bubbles start with order 3

The order on the edges can be set by:
- Joachim