Solve Energy equation with periodic BC in Nek5000

[khanhh...@gmail.com]

Hello All,

I am trying to solve periodic BC in nek5000, it run well with flow field. 

When I add energy equation with this model, it make a error in estimated eigenvalue as below

----------------

  Estimated eigenvalues

 EIGAA =    75.403882096254407     

 EIGGA =                        NaN

 EIGAE =   0.27728938678799259     

 EIGAS =   3.06449061462144760E-004

 EIGGE =                        NaN

 EIGGS =    2.0000000000000000     

-------------------

please give me some suggestion.

Thank you in advance.

[Filipe Brandao]

Any update on this?

[Yuan, Haomin]

Hi, 

you need to add an sink or source to your energy equation.

So you are solving temperature variant on the top of a linear profile.

Please check some reference. 

Haomin (Kirk) Yuan

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From: nek...@googlegroups.com <nek...@googlegroups.com> on behalf of Filipe Brandao <filipe....@gmail.com>
Sent: Wednesday, December 10, 2025 7:45 PM
To: Nek5000 <nek...@googlegroups.com>
Subject: [nek5000] Re: Solve Energy equation with periodic BC in Nek5000

 

Any update on this? Em segunda-feira, 4 de janeiro de 2021 às 04: 34: 12 UTC-5, khanhh. . . @ gmail. com escreveu: Hello All, I am trying to solve periodic BC in nek5000, it run well with flow field.   When I add energy equation with this model, it

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