A stationary formulation has per definition no time derivatives. Solving Equation 3-61 through Equation 3-65 requires a starting guess that is close enough to the final solution. If no such guess is at hand, the fully transient problem can be solved instead. This is, however, a rather costly approach in terms of computational time. An intermediate approach is to add a fictitious time derivative. Further details is found in Pseudo Time Stepping for Laminar Flow Models.