Hi Alexander, SVV was originally defined for special methods similar to the homogeneous expansions. The SH/PEM use of SVV came later and it is for these expansions we have developed the different kernels. Spencer Sent from my iPhone On 12 May 2024, at 00:10, Alexander Schukmann <alexander.schukmann@protonmail.com> wrote: This email from alexander.schukmann@protonmail.com originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Hello everybody, I am currently running Quasi-3D CG-SVV iLES with the IncNavierStokesSolver and noticed that the SVV PowerKernel is not activated/available for Fourier discretizations along homogeneous directions. However in the paper "Industry-relevant ILES of a high-performance road car via S/HPEM" (Mengaldo et al. 2021) it says: "The current best practice in Nektar has been to use the "DG" kernel in general while employin the "power-law" kenel only along homogeneous directions in case periodic boundary conditions are present" So does this mean the PowerKernel is only available if S/HP is also used along homogeneous directions? Why not use the DGKernel then? And how does one setup different SVV kernels for different spatial directions? If it DOES refer to the quasi-3D case, however, there seems to be an issue, since no output is given regarding SVV, if the "SpectralVanishingViscosityHomo1D" flag is set to "PowerKernel" within the session file. Also I noticed that it seems to be impossible to activate SVV only for the S/HP discretizations in quasi-3D cases, i.e. without using SVV for the Homo1D directions, but vice versa it works. All the best Alex Sicher versendet mit Proton Mail<https://proton.me/>. _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users