Project

Flow over a Backward-Facing Step Channel using Converge CFD

Procedures:

Preparing a channel to stimulate simple flow using Converge CFD.
Setting up the boundary conditions & simulation setup.
Base Grid meshing is to be done for 3 parameters,
- Case-1= dx = dy = dz = 2e-3m.
- Case-2= dx = dy = dz = 1.5e-3m.
- Case-3= dx = dy = dz = 1.2e-3m.
Using CYGWIN to execute the CFD solver & also to covert the results for all 3 cases.
Paraview to Post Processing the results.

Inputs:

Pre-Processing:

Setting up Boundry Conditions:

Processing for Case-1:

Meshing:

Velocity Contour:

Pressure Contour:

Processing for Case-2:

Meshing:

Velocity Contour:

Note: This Velocity contour was marked at the 15000th cycle.

Pressure Contour:

Note: This Velocity contour was marked at the 15000th cycle.

Processing for Case-3:

Meshing:

Velocity Contour:

Pressure Contour:

Post_Processing for Case-1:

Average Velocity Plot:

Mass Flow Rate plot:

Pressure Plot:

Plot for Total Cells Count per Processor :

Post_Processing for Case-2:

Average Velocity Plot:

Mass Flow Rate plot:

Pressure Plot:

Plot for Total Cells Count per Processor :

Post_Processing for Case-3:

Average Velocity Plot:

Mass Flow Rate plot:

Pressure Plot:

Plot for Total Cells Count per Processor :

Verdict:

We can see from the results that when the mesh is finer the contours profile looks detailed.
For higher mesh gradient the size of the solver also gets increased on the hard disk due to many output files were generated.
When the air crosses the step region a vacuum or low-pressure region is created along the bottom mid-corner which makes part of air to reverse its direction & compensates the low-pressure region which creates unsteady flow (TURBULENT) at the mid-section.
From the plots, we can see that the total pressure of the inlet is greater than the pressure at the outlet as the unsteady flow was created at the mid-section.

Ship work like this
in your own course.