Hi Manuel, I am not sure if I understand your question, but please keep in mind the following. If you want to produce a standard energy spectrum typical of turbulent flows, there is no direct functionality in Nektar for this. You would have to probe the solution in space and perform the required Fourier transforms with an auxiliary software, e.g. Matlab. Alternatively you could probe a single point in space over a given time span and rely on Taylor's frozen flow hypothesis to produce a spectrum. The latter is of course the only alternative in case you don't have a homogeneous direction in your flow. I suggest you take a look on a 2005 study by Richard Pasquetti, named "Spectral vanishing viscosity method for LES: sensitivity to the SVV control parameters", which seems to address the questions you are interested in. Kind regards, Rodrigo . On Thu, Dec 1, 2016 at 2:46 AM, Manuel F. Mejía De Alba <manu2958@gmail.com> wrote:
Dear Nektar users and team,
I'm working on the correct "guess" to parameters SVVCutoffRatio and SVVDiffCoeff of the model SVV LES (SpectralVanishingViscosity). I trying to determine the influence of that values on the Kinetic energy spectra. So, I need to get the values of the Kinetic energy as a function of the k (where k = 1:NUMMODES).
Using the filter "Modal energy" (user-guide 3.4.9) it is possible to obtain the integral over all the velocity not with of the modes k. It is possible but just with one-dimensional homogeneous expansion and I wanna plot the data on a general model.
May anyone gives me a hand with this, any help is appreciated.
Thanks in advance,
--- Manuel Felipe Mejía De Alba.
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