Dear YiLin,

I have had a look at the files you provided. To me it seems that you likely just have mistyped a value in your source term, which would be:

alpha = ln(2)/9 = 0.0770 (you have it included as 0.77 in your casefiles).

I did run and re-run the APE case with both your original settings and the corrected, lower alpha, and finally obtained amplitudes for the pressure of [-2.46; 0.64]. If I see that correctly, there is still a discrepancy to the analytical solution, but at least the values are in the right ballpark now.

I hope that already helps you a bit.

Best regards,
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Hanna Reinhardt, M.Sc.
Research Associate

Simulation of reactive Thermo-Fluid Systems (STFS)
Technische Universität Darmstadt

Otto-Berndt-Straße 2, 64287 Darmstadt
Raum: L1|01 293

Tel: +49 6151 16 24144
Fax: +49 6151 16 24140

www.stfs.tu-darmstadt.de

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Von: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> im Auftrag von Paul Liu <liuyilin.liu@gmail.com>
Gesendet: Montag, 31. Januar 2022 19:50
An: nektar-users@imperial.ac.uk
Betreff: [Nektar-users] Acoustic Solver Case Questions

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Hi All,

I am trying to run a simple case prescribing an exponential function that is sinusoidal in time for the energy equation in both APE and LEE solvers.

I have the analytical solution for this case. The results from APE and LEE solvers agree with each other but the amplitude is quite different from the analytical solution.

I have included a more detailed summary (pdf) and all the case setup files in the zip file.

I was wondering if I messed up the setup for the cases or is there some kind of scaling on the variables that I am not aware of?

Thank you all.

YiLin Liu

403-397-3457

liuyilin.liu@gmail.com

MASc Student at CML UBC