Thank you both for your help ________________________________ From: Margarida Moragues Ginard <mmoragues@bcamath.org> Sent: 27 January 2023 10:19 To: Andrew Barnes <A.Barnes2@lboro.ac.uk> Cc: Nektar mail list <nektar-users@imperial.ac.uk> Subject: Re: [Nektar-users] Help with using DIRK Time Integration Methods ** THIS MESSAGE ORIGINATED OUTSIDE LOUGHBOROUGH UNIVERSITY ** ** Be wary of links or attachments, especially if the email is unsolicited or you don't recognise the sender's email address. ** Hi Andrew, In our case we use second order and this is what we prescribe in the session file: <SOLVERINFO> [...] <I PROPERTY="TimeIntegrationMethod" VALUE="DIRKOrder2" /> [...] </SOLVERINFO> Cheers, Margarida On Fri, 27 Jan 2023 at 11:03, Andrew Barnes <A.Barnes2@lboro.ac.uk<mailto:A.Barnes2@lboro.ac.uk>> wrote: This email from A.Barnes2@lboro.ac.uk<mailto:A.Barnes2@lboro.ac.uk> 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. Hello everyone, I'm trying to use the DIRK Time Integration methods in the CompressibleFlowSolver but keep getting an error when trying to specify the order and variant. If I specify only <I PROPERTY="TimeIntegrationMethod" VALUE="DIRK" /> in SolverInfo it will work perfectly, however I am unsure which order this is using. When I try to define VALUE="DIRKOrder3" or in a separate TIMEINTEGRATIONSCHEME section as below instead, it will produce the error bad_function_call. <TIMEINTEGRATIONSCHEME> <METHOD> DIRK </METHOD> <ORDER> 3 </ORDER> </TIMEINTEGRATIONSCHEME> Could anyone clarify: 1. Which order is used for the default "DIRK" model? 2. What would be the correct way to specify the order of DIRK model? Thank you in advance, Andrew _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users -- Margarida Moragues Ginard MSCA-IF Researcher BCAM - Basque Center for Applied Mathematics Alameda de Mazarredo, 14 E-48009 Bilbao, Basque Country - Spain Tel. +34 946 567 842 mmoragues@bcamath.org<mailto:mmoragues@bcamath.org> | www.bcamath.org/mmoragues<http://www.bcamath.org/mmoragues> (matematika mugaz bestalde)