Channel flow simulation using CONVERGE CFD

1. Channel flow case is set, with the help of tutorial videos provided by convergent science.

2. Three different base mesh sizes are used

• 2e-4m
• 1.5e-4m
• 1.2e-4m

3. Cygwin is used to run the simulation and in the converge studio the binary outputs are post processed to the format that Paraview can read.

4. Line probe is created at a consistent location in all the three cases, using the \'plot over line\' command.

5. \'Velocity magnitude\' and \'velocity Y\' parameters are chosen for comparison. \'Velocity x\' is almost similar to the \'velocity magnitude\'(due to its dominant behaviour) and \'velocity z\' is constant, this is the reason why those two parameters are chosen for comparison.

6. Coordinates of the initial and final points of the line probe :

Point 1 :

x	y	z
0.08	0.005	0

Point 2 :

x	y	z
0.08	-0.005	0

7. Obtained plots are compared in a sinlge graph for better comparison.

GRID

Base mesh size 2e-4m

Base mesh size 1.5e-4m

Base mesh size 1.2e-4m

Velocity magnitude visualization at the end time

1. A small vertical white line in the below figure represents the line probe

2. This profile looks almost similar for all the above three cases

Velocity Y visualization at the end time

Base mesh size 2e-4m

Base mesh size 1.5e-4m

Base mesh size 1.2e-4m

Comparing the plots of above cases

1. As the base mesh size gets reduced, the curves obtained become more smooth, thus approaching the analytical solution

2. Fluctuations are obtained in the second plot, due to the effect of the mesh grid size