******************* 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. ******************* Hello everyone, I'm solving the interaction system of an incompressible fluid flowing past a flexible moving bodies and encontoured some problems. I wander whether the SolverType of VCSMapping support the mixed CG-DG projection, such as BDFImplicitOrder2 in the TimeIntegrationMethod? Since I want to apply the Substepping scheme in my simultiaon, the code experiences error when the TimeIntegrationMethod is set as ​​BDFImplicitOrder2. The solverinfo is shown as follows: <I PROPERTY="EQTYPE” VALUE="UnsteadyNavierStokes” /> <I PROPERTY="SolverType” VALUE="VCSMapping"” /> <I PROPERTY="EvolutionOperator” VALUE="Nonlinear"/> <I PROPERTY="Projection" VALUE="Mixed CG Discontinuous" /> <I PROPERTY="TimeIntegrationMethod” VALUE="IMEXOrder2”/> <I PROPERTY="TimeIntegraticonMethod" VALUE="BDFImplicitorder2”/> <I PROPERTY="Extrapolation" VALUE="Substepping" /> <I PROPERTY="SubstepIntScheme” VALUE="RungeKutta2 ImprovedEuler”/> Kind regards Zhipeng Yu