I see your point. Thank you! But it seems that hanging nodes is really 
annoying :) I will have a try.

在 2016年9月22日星期四 UTC-4上午7:38:35,Konstantin Ladutenko写道:
>
> BTW, the element in bottom left corner is too triangle for good FEM. To 
> solve this providing an additional element inside the curved boundary looks 
> to be a common approach, you can find more details here 
> http://dealii.org/developer/doxygen/deal.II/step_6.html#Abettermesh 
>
> среда, 21 сентября 2016 г., 18:15:05 UTC+3 пользователь Chenchen Liu 
> написал:
>>
>> Hi all,
>>
>>
>> I have to use quadratic shape function (Q2 elements) to do my project 
>> (2D). Previously the code works well with Q1 linear elements, when I want 
>> to input the gird with Q2 elements generated by Gmsh, it gives the 
>> following error:
>>
>> An error occurred in line <1418> of file <../source/grid/grid_in.cc> in 
>> function
>>
>>     void dealii::GridIn<2, 2>::read_msh(std::istream &) [dim = 2, 
>> spacedim = 2]
>>
>> The violated condition was: 
>>
>>     false
>>
>> The name and call sequence of the exception was:
>>
>>     ExcGmshUnsupportedGeometry(cell_type)
>>
>> Additional Information: 
>>
>> The Element Identifier <8> is not supported in the deal.II library when 
>> reading meshes in 2 dimensions.
>>
>>
>> And, it says the supported quad element should have 4 nodes and 4 edges. 
>> Just want to check whether deal.ii support Q2 elements by Gmsh.
>>
>> My mesh looks like the following
>>
>>
>> <https://lh3.googleusercontent.com/-Lk96g0ZRgFg/V-KjPDZp3cI/AAAAAAAAAKs/NZpvWhx06Y4uL6x-6b1gLVfUAayRY5p2gCLcB/s1600/11.png>
>>
>>
>>
>> If deal.ii does not support higher order element by Gmsh, what other 
>> format is recommended? Thanks!
>>
>>
>> Best,
>>
>> Chenchen
>>
>>
>>
>>

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