Hi All,

With iterative time advancement I can watch convergence of a flow property (e.g. velocity) at a point on a per-iteration basis.

Does anyone know how to do this with non-iterative time advancement (NITA)? I only seem to be able to get a report of the residual after each time step and have no idea what it is doing within the time step itself.

Cheers, Jim.

With the NITA schemes with either Fractional-Step or PISO scheme, there's no need for the inner iterations (velocity-pressure), hence the name NITA.That's why FLUENT report the resiudals only after each time-step. Yet the NITA schemes preserve the second-order accuracy. The only iterations being done behind the scene are for the individual linearized equations and for the coupled (and non-linear)momentum equations.

hi helper how to apply this procedure and also do u know about the variable time stepping procedure. thank u in advance bye