[abdo1984]

Hello dears
I have to solve a simple a PDE for an artificial time not physical time.
ddt(psi) + grad(psi) = signPsi
where signPsi is just the sign of psi
My attempt to do so is creating new time instant runTime1 which has the same value of runTime . when I reached the equation I did
runTime.setDeltaT(0) ;
fvMatrix psiEq(fvm::ddt(psi) + fvc::grad(psi) == signPsi ) ;
psiEq.solve() ;
Then I synthesized runTime with the phyiscal runTime1
Foam::Time& runTime(runTime1) ;
runTime.setDeltaT(runTime1.deltaTValue()) ;

but I got error message after few iterations
#0 Foam::error:rintStack(Foam::Ostream&) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2 in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::Time::adjustDeltaT() in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#4
at ~/OpenFOAM/abdo-2.3.0/application/solvers/multiphase/sclsvof10/solveLSE.H:32
#5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#6
in "/home/abdo/OpenFOAM/abdo-2.3.0/platforms/linux64GccDPOpt/bin/scLsVof10"

Any one has an idea to solve such a problem, I would be so thankful.