[Vasiliy]

Hi All,

I construct implicit solver for Navier Stokes equations.
I use Roe method to calculate explicit fluxes.

My question is about convective and viscous Jacobians in implicit part.
I was told that some of such Jacobians can be excluded from large sparse matrix to accelerate convergence.

It is not connected with technic where viscous Jacobian is changed with spectral radius.

It looks like some of Jacobians are fully removed to accelerate convergence.

Does anybody have information about such algorithms?

Thanks