Consider Prob. 15–13C again, except let the boundary condition on the common edge between blocks 1 and 2 be a fan with a specified pressure rise from right to left across the fan. Suppose an incompressible CFD code is run for both cases (with and without the fan). All else being equal, will the pressure at the inlet increase or decrease? Why? What will happen to the velocity at the outlet? Explain.

Data from Problem 15-13C

An incompressible CFD code is used to simulate the flow of air through a two-dimensional rectangular channel (Fig. P15–13C). The computational domain consists of four blocks, as indicated. Flow enters block 4 from the upper right and exits block 1 to the left as shown. Inlet velocity V is known and outlet pressure P_out is also known. Label the boundary conditions that should be applied to every edge of every block of this computational domain.

FIGURE P15–13C

Out Block 1 -Pout Block 2 In Block 3 Block 4