Hello Krishanu:
The error is made when you define the line/surface. You don’t have to check
the mesh file or each mesh element but the .geo file.
For example, here my line loop defines the surface bounded by vertex in
the order of [3.7,8,4], but I defined my line as the following.
So when I define the surface, line 1 and 16 are negative.
Line(1) = {4, 8};
Line(16) = {3, 4};
Line(17) = {3, 7};
Line(18) = {7, 8};
Line Loop(53) = {17, 18, -1, -16};
Ruled Surface(54) = {53};
And you just need to make sure all line/surface are defined with the same
notation (left or right hand)
On Tue, Mar 9, 2021 at 9:31 PM krishan...@gmail.com <
krishanu.se...@gmail.com> wrote:
> Hello Jane,
>
> Thanks for the response. I understand why there could be an issue with the
> ordering. But I am using the GUI of Gmsh and the mesh created has about 400
> elements. So it is a little difficult to manually check the ordering of the
> vertices of each element. Do you know if there is any other way to enforce
> the ordering in the GUI?
>
> Thanks,
> Krishanu
>
> On Tuesday, 9 March 2021 at 15:33:55 UTC-5 Jane Xu wrote:
>
>> Hello Krishna:
>> I had this issue before. It just means that when you select mesh entities
>> (vertex) to form a surface, you have to pay attention to the order of which
>> entity goes first, second,... it would be clear if you look at the geometry
>> txt file.
>> Best regards
>> Jane
>>
>> On Tue, Mar 9, 2021 at 3:21 PM krishan...@gmail.com <krishan...@gmail.com>
>> wrote:
>>
>>> Hello Paras,
>>>
>>> Thanks for your response. I have been using the GUI of Gmsh to generate
>>> the mesh. Do you have any suggestions about what to do in Gmsh to avoid the
>>> negative volume issue?
>>>
>>> Do meshes generated with Abaqus, are able to avoid the above-mentioned
>>> issue of negative volume?
>>>
>>> Thanks in advance.
>>>
>>> Krishanu
>>>
>>> On Tuesday, 9 March 2021 at 13:14:27 UTC-5 Paras Kumar wrote:
>>>
>>>> I use the .inp format of Abaqus, since my code relies on material-IDs
>>>> which (in my limited experience) are easy to handle with .inp format. I
>>>> generate meshes using both GMSH (here as you mentioned, one needs to be
>>>> careful to add curves/surface parts in the correct order to avoid negative
>>>> volumes) and Abaqus CAE (works fine for relatively simple geometries) to
>>>> generate such meshes. Not aware of other quad/hex generating open source
>>>> codes. The dealii::GridGenerator namespace also offers possibilities to
>>>> generate meshes for certain primitive shapes and combinations thereof.
>>>>
>>>> Best,
>>>> Paras
>>>>
>>>> On Tue, Mar 9, 2021 at 6:33 PM krishan...@gmail.com <
>>>> krishan...@gmail.com> wrote:
>>>>
>>>>>
>>>>> I am wondering what meshing software produces output files that would
>>>>> work best with deal.ii. I have tried Gmsh, but it seems when this mesh
>>>>> (generated by Gmsh) is imported in deal.ii, it is facing the issue of
>>>>> negative volume fraction of a cell (could be because of the order of nodes
>>>>> written in Gmsh?). Any suggestion about any other meshing software that
>>>>> could be used which would avoid this issue?
>>>>>
>>>>> Thanks
>>>>>
>>>>
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