Dear all, I've just started using high-order CFD (using Nektar++). To begin with, I've just been running the Isentropic vortex advection case in a 50x20 domain using the IsentropicVortex test case provided. The issue is that I've continually been observing spurious oscillations (a figure is attached) in velocity field. Increasing the resolution improves the situation a little, but I could not completely get rid of the oscillations. Next, I wanted to use dealiasing. However, the simulations do not even start when I use SVV and SPECTRALHPDEALIASING. Plus, I could not find any stabilization technique implementation in "nektar++-4.4.0/solvers/CompressibleFlowSolver/Utilities" folder (which is the case in Incompressible solver). Can anyone clarify if any dealiasing technique is implemented in Compressible Solver and if there are any future plans on that? Cheers and regards, Vishal --- *Vishal SAINI* Master of Research, University of Cambridge. Master in Turbulence EC Lille, ENSIP and ENSMA France. Contact: vs434@cam.ac.uk, vishal.saini.nitj@gmail.com <vishal.saini.nitj@gmail.com> (+44) 7 459 186 139 (UK) (+33) 7 58 24 84 02 <+33%207%2058%2024%2084%2002> (France)