******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Dear Nektar++ team, I hope this email finds you well! I'm a student from TUM in Munich, Germany. And I am currently running a 3DH1D simulation using the IncSolver module in Nektar++ version 5.8.0. I encountered an issue when trying to use the Integral filter. The simulation terminates with an error message (included at the end of this email). Moreover, when I comment out the <FILTER TYPE="Integral"> block, the simulation runs normally. I found an early issue, 4yr ago, on GitLab (#227), which reveals that the Integral filter should be supported in homogenous simulations. I also tried using same modals for all composites/variables, still same error message. My question is, dose ' integral' support 3DH1D since composites are 2D(Quadrilateral), which is not mentioned specifically in the doc? And if yes, what can I do to fix my issue for 3DH1D simulation? I really tested a lot before I send this email. Your sincerely, Boning P.S. Partial set-up are listed here, and full session.xml, mesh.xml and log (verbose) file are attached. <EXPANSIONS> <E COMPOSITE="C[1,2,3,5]" NUMMODES="6" TYPE="MODIFIED" FIELDS="u,v,w,p" /> <E COMPOSITE="C[4,6]" NUMMODES="8" TYPE="MODIFIED" FIELDS="u,v,w" /> <E COMPOSITE="C[4,6]" NUMMODES="7" TYPE="MODIFIEDQUADPLUS1" FIELDS="p" /> </EXPANSIONS> <FILTER TYPE="Integral"> <PARAM NAME="OutputFile">Integral</PARAM> <PARAM NAME="OutputFrequency">5</PARAM> <PARAM NAME="OutputPrecision"> 12 </PARAM> <PARAM NAME="Composites">C[4,5], C[4,6], C[1-4]</PARAM> </FILTER> [hyd39:90887] *** Process received signal *** [hyd39:90887] Signal: Segmentation fault (11) [hyd39:90887] Signal code: Address not mapped (1) [hyd39:90887] Failing at address: 0xb0 [hyd39:90887] [ 0] /lib64/libc.so.6(+0x57900)[0x7fb616e57900] [hyd39:90887] [ 1] /opt/nektar++/5.8.0/lib64/libSolverUtils.so.5.8.0(_ZN6Nektar11SolverUtils14FilterIntegral12v_InitialiseERKNS_5ArrayINS_4OneDEKSt10shared_ptrINS_12MultiRegions7ExpListEEEERKd+0x23b)[0x7fb61ce9f2cb] [hyd39:90887] [ 2] /opt/nektar++/5.8.0/lib64/libSolverUtils.so.5.8.0(_ZN6Nektar11SolverUtils14UnsteadySystem9v_DoSolveEv+0x360)[0x7fb61cee3240] [hyd39:90887] [ 3] /opt/nektar++/5.8.0/lib64/libSolverUtils.so.5.8.0(_ZN6Nektar11SolverUtils14DriverStandard9v_ExecuteERSo+0x30a)[0x7fb61ce2ceba] [hyd39:90887] [ 4] IncNavierStokesSolver[0x44928a] [hyd39:90887] [ 5] /lib64/libc.so.6(+0x40e6c)[0x7fb616e40e6c] [hyd39:90887] [ 6] /lib64/libc.so.6(__libc_start_main+0x87)[0x7fb616e40f35] [hyd39:90887] [ 7] IncNavierStokesSolver[0x4782f1] [hyd39:90887] *** End of error message ***