Or, you could use as a stable pair of finite elements the FE_Q(k)-FE_DGP(k-1) pair:
D. Boffi and L. Gastaldi. On the quadrilateral Q2-P1 element for the Stokes problem. Int. J. Numer. Meth. Fluids, 39 (2002), 1001-1011.
This pair of finite elements is known to produce consistently better results for discontinuous pressures (after all, p is only supposed to be in L2).
L.
> On 7 Apr 2017, at 23:51, Sumedh Yadav <
sumedh...@gmail.com> wrote:
>
>
> I would like to add an idea I intend to apply but right now am clueless of how to apply.
> In the earlier post I mentioned issue of 'spurious currents'. In the past researchers have tried quite a few approaches to handle this. One of them involves reconstruction of computed pressure field. In essence if you look carefully at the images I shared in the last post you can see the failure of taylor-hood elements to handle the discontinuity in pressure which in turn makes the velocity field oscillatory/spurious. Reconstruction of pressure is done only in the interface region by interpolating the local normal direction values of pressure inside and outside this interface region. I am able to construct the normal field necessary for this local reconstruction. But I need to traverse to neighboring cells in both directions of this normal vector in the interface cells. I am clueless to how this can be done in deal.ii. The normal field image -
>
>
>
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