Hello, Sorry I didn't know about the non-confirming mesh problem. Now I have prepared a conforming mesh (file attached). Can you please check whether it is okay? It is also showing NAN. Thanks. On Tue, Dec 19, 2017 at 7:31 PM, SIDHARTHA SANKAR SAMANTARAY < sss12@iitbbs.ac.in> wrote:

Hello, Sorry I didn't know about the non-confirming mesh. Now I have prepared a conforming mesh by just clicking on 2D mesh option in gmsh. Can you please check whether it is okay? It is also showing NAN. I am online, so you can ask me anything more you want.

Thanks.

On Tue, Dec 19, 2017 at 6:47 PM, Douglas Serson <d.serson@gmail.com> wrote:

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Hi Sidharth,

Your geo file looks fine to me. However, I noticed a couple of problems in the mesh of the xml you just sent. First, composites 2 and 3 are switched compared to the geometry in the geo file (and to what I think makes sense in terms of boundary conditions). Also, the mesh near the inflow is non-conforming, as you can see in the attached image (i.e. one edge of the large element is connected to 3 different elements). This is not supported by Nektar++. How exactly did you generate this mesh? Using your geo file I obtained a completely different mesh from gmsh.

Cheers, Douglas

2017-12-19 6:37 GMT-02:00 SIDHARTHA SANKAR SAMANTARAY <sss12@iitbbs.ac.in

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:

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Hi Douglas, Thanks a lot for the solution. I found that line was in every code of mine. But even after correcting that line, the same error can be seen with a structured mesh. I am sending you the gmsh script this time. Please tell me whether structured mesh has to be taken care in a special way. And another thing i want to know is whether each grid should be orthogonal to run the solver?

Regards, Sidharth

On Tue, Dec 19, 2017 at 2:06 PM, SIDHARTHA SANKAR SAMANTARAY < sss12@iitbbs.ac.in> wrote:

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Hi Douglas, Thanks a lot for the solution. I found that line was in every code of mine. But even after correcting that line, the same error can be seen with a structured mesh. I am sending you the gmsh script this time. Please tell me whether structured mesh has to be taken care in a special way. And another thing i want to know is whether each grid should be orthogonal to run the solver?

Regards, Sidharth

On Tue, Dec 19, 2017 at 3:02 AM, Douglas Serson <d.serson@gmail.com> wrote:

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Hi Sidharth,

I checked your xml file and it is missing a </REGION> on line 90. By fixing this I was able to start the simulation without getting a NaN.

Cheers, Douglas

2017-12-18 9:57 GMT-02:00 SIDHARTHA SANKAR SAMANTARAY < sss12@iitbbs.ac.in>:

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Hello, I am seeing NAN time integration error while solving a simple problem with compressible NS solver. Can anyone tell me what is probably causing it? I have attached the screenshot of the error and the xml file running the solver.

Thanks, Sidharth

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