Hi All, I am using Nektar++ compressible flow solver. I noticed the p-adaptive algorithm can be used to optimize the computational cost. I have read the user guide but I still do not know how to perform it. I just add the AdaptiveModes and AdaptiveMinModes in the parameters. The SolverInfo like this: <SOLVERINFO> <I PROPERTY="EQTYPE" VALUE="EulerCFE" /> <I PROPERTY="Projection" VALUE="DisContinuous" /> <I PROPERTY="TimeIntegrationMethod" VALUE="ClassicalRungeKutta4" /> <I PROPERTY="UpwindType" VALUE="Roe"/> <I PROPERTY="Driver" VALUE="Adaptive" /> </SOLVERINFO> I use FieldConver -m nummodes to see the polynomial order distributions. But it seems the polynomial order is not changed in the fields. Does anyone familiar with it? I found a paper in 2013 about an inviscid transonic flow past a NACA0012 airfoil. I think this approach can be done by compressible flow solver. Many thanks for your help! Shujie University of Southampton