understanding dual-time stepping

srinath

Hi

I have just started reading about dual time stepping. I want to implement the Weiss and smith preconditioner, with dual time-stepping to maintain temporal accuracy.

I have 1 fundamental doubt When the multistage algorithm for the dual time stepping is implemented, how do we know that d/d(tau)(..)=0? I understand how backward difference is used for the physical time term and how the residual is calculated etc.

How many stages should there be to ensure convergence of the dual-time stepping?

Thanks Srinath