## Channel flow simulation using CONVERGE CFD

OBJECTIVE

• To set up a channel flow for three different mesh grid sizes using convergent science and paraview.
• To show various velocity and pressure contours for the different mesh.
• To show the various plot of velocity,   pressure, mass flow rate and total cell count for different mesh grids.

PROFILE GEOMETRY:

Lengths along x,y, z-axis are;

x=0.1m y=0.01m z=0.01m

INITIAL BOUNDARY CONDITIONS:

• The flow is general flow.
• Air contains a mixture of O2 and N2 which will flow through the required geometry.
• The pressure at the inlet and outlet of the geometry is 100001 Pascal and 100000 Pascal.
• The Prandtl number is 0.9 and the Schmidt number is 0.78.
• The total number of cycles performed is 15000.

MESH SIZES:

• dx = 2e-4m              dy = 2e-4m       dz = 2e-4m
• dx = 1.5e-3m           dy = 1.5e-3m    dz = 1.5e-3m
• dx =  1.0e-3m          dy = 1.0e-3m    dz = 1.0e-3m

These mesh sizes provide study of the profile. Finer the mesh size ,more better results can be obtain about the profile.

RESULTS:

Base Mesh sizes are provided below

base mesh size (2e-4m)

base mesh size (1e-3m)

base mesh size (1.5e-3m)

The pressure contours for different meshes are provided below

base mesh size (2e- 4m)

base mesh size (1.5e-3m)

base mesh size (1e-3m)

Velocity contours for different mesh sizes are provided below

base mesh size (2e-4m)

base mesh size (1.5e-3m)

base mesh size (1e-3m)

Total cell count plot

case1

case 2

case 3

Pressure plot

case 1

case 2

case 3

Velocity plot

case 1

case 2

case 3

Mass flow rate plot

case 1

case 2

case 3

CONCLUSION:

• Finer meshing provides better results about the profile as finer meshing makes it smooth.
• According to the plots as the mesh size decreases the cell count increases.
• At the initial cycles, the velocity doesn't remain the same but after a few more cycles it becomes constant
• At the initial cycles, the pressure fluctuates but after a few more cycles it becomes constant
• The mass flow rate during inlet and outlet remains the same, according to the law of conservation of mass.

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