To model and investigate the influence of inlet flow velocity on the flow of water in a straight plane channel, using Computationa

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To model and investigate the influence of inlet flow velocity on the flow of water in a straight plane channel, using Computational Fluid Dynamics.

Apparatus:

ANSYS CFX will be used as currently available at QUT.

Problem:

For a straight channel of height H=20 mm and length L=1 m, as shown below, create a two-dimensional CFD model. You will create an initial mesh and run the simulations for an inlet velocity of 0.1 m/s. Then you will refine the mesh 2 times and re-run the simulations for Uf= 0.1 m/s. Finally, you will run the simulations for inlet velocities of 0.2 m/s and 0.5 m/s using the refined mesh to determine axial velocity profiles at different x locations along the channel.

The fluid flowing through the channel is water, with the following properties at 10 °C:

Density, U = 1,000 kg/m3

Dynamic viscosity, P = 1.307 x 10-3 Pa/s

The boundary conditions for all the CFD models are:

Inlet velocity, Uf= 0.1 m/s; 0.2 m/s; 0.5 m/s ::Outlet Pressure = atmospheric pressure :: Velocity at walls = 0 m/s (no slip)

Flow = Laminar (first case, Uf= 0.1 m/s) then Turbulent using default settings (second and third cases 0.2 m/s; 0.5 m/s).