I do not recall if this has been explored previously. I am guessing it is saturating due to an formulation issue possibly as you suggest to do with the exact solution. However is this saturation also related to the time discretisation error or are you hitting that error boundary? Have you tried reducing the time step.

Spencer

On 17 Sep 2018, at 19:52, Shervin Sammak <shervin.sammak@gmail.com> wrote:

Dear all,

Here at Pitt, we are trying to solve the 2D Taylor Green Vortex solution from the tutorial and study the effect of resolution on L2 norm. As it is shown in the attached file, it appears that there is no difference at all between p=5 and p=6. It also looks like that the L2-error cannot be reduced below approx. 7e-6. I assume that the L2 norm provided at the end of simulation output is the comparison to the exact solution of the TGV. Are we missing something?

Regards,

Shervin

--

-----------------------------------------------------------
Shervin Sammak
Research Assistant Professor
Center for Research Computing
University of Pittsburgh
4420 Bayard St
Pittsburgh, PA 15213
E-mail: shervin.sammak@pitt.edu
Website: www.crc.pitt.edu

~ You chase quality and quantity will chase you.

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Spencer Sherwin FREng, FRAeS
Head, Aerodynamics,
Director of Research Computing Service,
Professor of Computational Fluid Mechanics,
Department of Aeronautics,
s.sherwin@imperial.ac.uk South Kensington Campus,
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