Hi all, Dear Ding

It is funny because a few months ago I was like you. Actually, I made the cavity flow problem and I get the same results of Ghia 1982 (High-Re Solutions for Incompressible Flow Using the Navier-Stokes Equations and a Multigrid Method, U. GHIA, K. N. GHIA, AND C. T. SHIN), you can find enclose the comparative plots, dots are the data reported by Ghia and in continuous the nektar results.

V on the central horizontal line

U on the central vertical line.

I look your file and I don't sure but I think you have to specify the fields to made the expansion, I mean

</EXPANSIONS>

Please tell me how it is going.

Regards,

On 22 August 2016 at 08:02, Chris Cantwell <c.cantwell@imperial.ac.uk> wrote:

Dear Ding,

In what way does your measurement differ from the literature. Is the difference substantial? Could you provide a plot of the output showing the differences?

One challenge in this problem is the inconsistent boundary conditions at the ends of the top wall. The values used at the top left and top right corners depends on the order of the boundary conditions. You could therefore swap the order of the boundary regions/conditions in the XML file and see if that improves your solution?

Cheers,
Chris

On 22/08/16 06:15, 丁老师 wrote:

Dear Nektar group:
I am conducting numerical simulation for 2D lid driven cavity
problem with Re=1000. Attachment please find my xml file.
But i found the output results at monitor point is different from
benchmark solution from open literature. I have changed the order from
20 to 40, the nothing changed.
but the stream line pattern is the same with benchmark solution.
what should i do further>

Regards
Your Sincerely
Ding

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

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