Hi all, I need help for my simulation of the flow over a NACA 0012 Airfoil. I try to simulate the flow with a mach Number of M=0.4 and a reynoldsnumber of Re=408000. In every test my simulation is terminated with the message: NaN found in variable "rhou", terminating NaN found in variable "rhov", terminating NaN found in variable "E", terminating. I started the simulation with the same mach number and a lower reynoldsnumber of 4080 and it worked. So my question is, is there any solution for that problem to fix the instability of the simulation? Here is my SolverInfo data which i entered in the .xml File. Is it possible that an other UpwindType will fix the problem? <SOLVERINFO> <I PROPERTY="EQType" VALUE="NavierStokesCFE" /> <I PROPERTY="Projection" VALUE="DisContinuous" /> <I PROPERTY="AdvectionType" VALUE="WeakDG" /> <I PROPERTY="DiffusionType" VALUE="LDGNS" /> <I PROPERTY="TimeIntegrationMethod" VALUE="ClassicalRungeKutta4" /> <I PROPERTY="UpwindType" VALUE="HLLC" /> <I PROPERTY="ProblemType" VALUE="General" /> <I PROPERTY="ViscosityType" VALUE="Variable" /> </SOLVERINFO> My simulation runs with a CFL-number of 0.7. Thanks for any hint. If you need more information, please let me know . Best regards Manuel Gipperich