Relaxation scheme
 

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Re: Relaxation scheme
 

relaxation schemes are used to speed up the convergence to a steady state. the most simple is SOR. For the Navier Stokes equations there are some other tecniques based on the idea of the relaxation scheme. Try to have a look to the work of jameson on implicit residual smmothing or local time stepping.

I think you can find it easily on the net.