Week 1: Channel flow simulation using CONVERGE CFD
AIM:
1) Running simulations for the Channel flow using three different Base Mesh sizes and examining the resulting plots.
Channel Flow & Geomtery:
PROCEDURE:
Three different mesh sizes:
- 2e-4m
- 1.5e-4m
- 1.0e-4m, were used to simulate the channel flow. The plots for velocity, pressure, and mass flow rate were analyzed and discussed.
Initial Conditions:
- Pressure-based steady-state solver
- No of Cycles: 10000 cycles to 18000 cycles.
- Inlet pressure: 100001 Pa
- Outlet Pressure: 100000 Pa
- Gas: Air Mixture.
- Base Mesh: (2e-4m)
2. Base Mesh: (1.5e-4m)
3. Base Mesh: (1e-4m)
VELOCITY:
For Case 1:
- Mesh Size: 2e-4m
For Case 2:
- Mesh Size: 1.5e-4m
For Case 3:
- Mesh Size: 1.0e-4m
Observation:
The velocity contour and plots for the three simulated cases are displayed above. The results indicate that the first case, which had a base mesh of 2e-4m, reached convergence within 7000 iterations or cycles, whereas the other two cases required approximately 14000 to 18000 cycles to converge. It should be noted that reducing the mesh size led to longer simulation times
PRESSURE:
For Case 1:
- Mesh Size: 2e-4m
For Case 2:
- Mesh Size: 1.5e-4m
For Case 3:
- Mesh Size: 1.0e-4m
Observation:
In all three cases, the pressure convergence was faster than the velocity convergence. The channel flow was created by an inlet pressure of 100001 Pa and an outlet pressure of 100000 Pa.
MASS FLOW RATE:
For Case 1:
- Mesh Size: 2e-4m
For Case 2:
- Mesh Size: 1.5e-4m
For Case 3:
- Mesh Size: 1.0e-4m
Observation:
The mass flow rate exhibits the same behavior as the velocity because it is dependent on velocity.
CONCLUSION:
When the mesh size becomes finer, the number of cells increases exponentially, resulting in a more refined output.