Dear friends:
       
      The mesh1 has 2*2 element , with an order of 40.
      The mesh 2 has 8*8 element, with an order 0f 10.

      I am  using these meshes with same order for the simulation of lid driven cavity problem at Re=1000. Both system can give converged solutions with a time step of 0.001.    But mesh1's results is different from the benchmark solution greatly. 
       Could you please give me some suggestions about this phenomeno.

Regards
   









At 2016-08-22 21:02:26, "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, ¶¡ÀÏʦ 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
>South Kensington Campus
>London SW7 2AZ
>Email: c.cantwell@imperial.ac.uk
>www.imperial.ac.uk/people/c.cantwell
>
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