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In step 3 the second correction to the momentum is determined. The lumped equations are solved and the solution is added to \Delta \boldsymbol{V}^{*} in routine resultsv2.f (again in fields v(1,*), v(2,*) and v(3,*)). Finally, the fluid boundary conditions in the form \rho_i \boldsymbol{V}_{i+1} are applied and \Delta \boldsymbol{V}^{**} is changed appropriately.