CFDEM2.71 and 2.9.0

Hi all,

There are several differences between CFDEM2.90 and CFDEM2.7.1 that caused significant changes in results of my simulation. The solverPiso codes have some important differences, particularly

in 2.7.1:

fvVectorMatrix UEqn
(
fvm::ddt(voidfraction,U) + fvm::Sp(fvc::ddt(voidfraction),U)
+ fvm::div(phi,U) + fvm::Sp(fvc::div(phi),U)
// + turbulence->divDevReff(U)
+ particleCloud.divVoidfractionTau(U, voidfraction)
==
- fvm::Sp(Ksl/rho,U)
);

While in 2.9.0:

fvVectorMatrix UEqn
(
fvm::ddt(voidfraction,U) - fvm::Sp(fvc::ddt(voidfraction),U)
+ fvm::div(phi,U) - fvm::Sp(fvc::div(phi),U)
// + turbulence->divDevReff(U)
+ particleCloud.divVoidfractionTau(U, voidfraction)
==
- fvm::Sp(Ksl/rho,U)
);

Why the positive (+fvm::) in version 2.7 turned into negative (-fvm::) ?

Could anyone give me a hint on this issue?

Thanks,

Nathan,