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1. First Question of Two: la) Discuss the best proposed grid topology for the channel flow over the circular step shown in Fig. 1 below Solid Surface 1 Flow direction Inlet Exit 1 u Solid Surface Solid Surface Fig. 1b) Equation (1) below is the momentum equation for two-dimensional boundary layer flows in the Cartesian coordinates (xy) ди du na²u + дах (1) In equation (1), u and are the components of the velocity vector in the x- and y.directions respectively, pis pressure, pis density and is the dynamic viscosity 1) Discuss whether equation (1) ts linear or non-linear indicating the source of nonlinearity, if applicable i) Identify the boundary and/or initial conditions required to solve equation (1) vay 1. Ap pdx paya Activate