Channel Flow Simulation using Converge Studio CFD
1. The Case setup is been done of the Channel flow in Converge with the help of video's provided by Convergent Science.
2. Prepared the model along with the flagging.
3. The case is run for 3 different mesh base sizes as flows:
- 2e-4m
- 1.5e-4m
- 1.0e-4m
4. Ran the simulation using Cygwin Terminal with 4 processors and obtained the output binary files.
5. In Converge Studio these binary output files are been 'Post-processed' in the format for Paraview.
6. Line probe is created with the same coordinates in all 3 cases using 'Plot Over Line' command, which are as follows:
x: 0.08 y:0.005 z:0
x: 0.08 y:-0.005 z:0
7. 'Velocity Magnitude', 'Velocity X', 'Velocity Y' and 'Velocity Z' are the chosen parameters. Where velocity z is constant or zero and 'Velocity Magnitude', 'Velocity X' shows similar results.
GRID
As the base mesh size decreases the no. of cells per inch in mesh increases, increasing the accuracy to understand the behaviour of fluid flow.
1. Base mesh size 2e-4m
2. Base mesh size 1.5e-4m
3. Base Mesh size 1.2e-4m
Velocity Magnitude and Velocity X Flow Visualization without Surface Edges
- We can clearly see here, Velocity Magnitude and Velocity X flow of all base mesh sizes look similar.
- Because of the NO-SLIP, the parabolic velocity boundary layer profile gets created in a hydrodynamically fully developed region.
- Shear stress depends on the slope of the velocity profile at the surface and the velocity remains unchanged in the developed region in a fully developed region, the shear stress also remains constant.
- The shear stress is directly proportional to the pressure drop which is maximum at the inlet of the pipe.
- The boundary surface divides the flow in a pipe into 2 regions: the boundary layer region, in which the viscous effects and the velocity changes are significant, and the irrotational(core) flow region, in which the frictional effect is negligible and the velocity remains constant.
1. Base mesh size 2e-4m
2. Base mesh size 1.5e-4m
3. Base mesh size 1.2e-4m
Velocity Y Flow Visualization without Surface Edges
1. Base mesh size 2e-4m
2. Base mesh size 1.5e-4m
3. Base mesh size 1.2e-4m
Series Parameters (Pressure, Velocity Magnitude, Velocity X, Velocity Y, Velocity Z) Graphs:
1. Base mesh size 2e-4m
Pressure
Velocity Magnitude and Velocity X
Velocity Y
2. Base mesh size 1.5e-4m
Presssure
Velocity Magnitude and Velocity X
Velocity Y
3. Base mesh size 1.2e-4m
Pressure
Velocity Magnitude and Velocity X
Velocity Y
Observation
1. When we look and compare all the graphs, it is seen that as the base mesh size gets reduced, the graphs or plots tend to become smoother which approaches Analytical Solution.