snappyHexMesh Feature line extraction is only valid on closed manifold surfaces
 

Hi everyone!
I'm trying to use snappyHexMesh to investigate the flow across a cilinder, with its axis parallel to the fluid flow. The blockMesh command works fine, but when I apply the surfaceFeatures step, it gives me this error:

/*---------------------------------------------------------------------------*\

========= |

\\ / F ield | OpenFOAM: The Open Source CFD Toolbox

\\ / O peration | Website: https://openfoam.org

\\ / A nd | Version: 10

\\/ M anipulation |

\*---------------------------------------------------------------------------*/

Build : 10-c4cf895ad8fa

Exec : surfaceFeatures

Date : Apr 12 2023

Time : 00:40:46

Host : "lome-VirtualBox"

PID : 6034

I/O : uncollated

Case : /home/lome/Desktop/prove_surfacefeatures/MissileSenzaAlette2022/Prova1

nProcs : 1

sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)

allowSystemOperations : Allowing user-supplied system call operations



// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

Create time



Reading "surfaceFeaturesDict"



Surface : "missile_senza_alette.stl"





Feature line extraction is only valid on closed manifold surfaces.

fatal flex scanner internal error--no action found

I can't understand from the last two lines how to solve the problem. Thank you for your help!!

Lorenzo