Hi Amitvikram,

Those are indeed the options available. We typically do not print L2/Linf errors every time-step due to the cost of the calculation (and communication in a parallel simulation) and their limited use in diagnosing problems in all but the simplest of simulations. They are typically only for evaluating the error between the computed solution and an analytical solution which might be available in some cases.

If you wanted, you could probably quite easily write a Filter, similar in structure to the FilterCheckpoint module, which computes the L2/Linf errors and writes them out every N timesteps.

Cheers,
Chris


On 20/01/16 21:39, Amitvikram Dutta wrote:

Hi Spencer,

As I see it, there are two options to monitor the solution's progress.
The first is to convert one of the checkpoint files to a vtu format and
view the simulation on a post processor such as paraview. The second is
to include a filter to write out history files at regular intervals
which can be monitored as above.

One also has the option of monitoring when values of certain variable
exceed chosen maximum or minimum limits at through the ThresholdMax and
ThresholdMin filters respectively.

Did I miss anything?
Also, I think I'm missing an option where the solver prints out the L2
and Linf error after each iteration. For my cases the values only show
up at the end -usually after the solution has crashed-. I was wondering
what the option was to set it to print after every iteration.

Sincerely,

*Amitvikram Dutta*

*MASc Candidate**
*

*Graduate Research Assistant *

*Okanagan CFD Laboratory*

*University of British Columbia | Okanagan Campus***


On Wed, Jan 20, 2016 at 5:35 AM, Sherwin, Spencer J
<s.sherwin@imperial.ac.uk <mailto:s.sherwin@imperial.ac.uk>> wrote:

    Hi Amitvikram,

    There are history points and force profiles. Much of this
    functionality is provided through filters. Have a look at the user
    guide info on this and let us know if there are any confusions.

    Cheers,
    Spencer.

    On 19 Jan 2016, at 22:32, Amitvikram Dutta <amitvdutta23@gmail.com
    <mailto:amitvdutta23@gmail.com>> wrote:

    Hi,

    Is there some form of a logfile implementation for Nektar++ which
    one can query as a simulation is proceeding in order to monitor
    convergence?


    Sincerely,
    _______________________________________________
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    Spencer  Sherwin
    McLaren Racing/Royal Academy of Engineering Research Chair,
    Professor of Computational Fluid Mechanics,
    Department of Aeronautics,
    Imperial College London
    South Kensington Campus
    London SW7 2AZ

    s.sherwin@imperial.ac.uk <mailto:s.sherwin@imperial.ac.uk>
    +44 (0) 20 759 45052




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Chris Cantwell
Imperial College London
South Kensington Campus
London SW7 2AZ
Email: c.cantwell@imperial.ac.uk
www.imperial.ac.uk/people/c.cantwell

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