Week 3: Flow over a backward facing step
Answer
This is a simple geometry for the analysis of a fluid through a backward-facing step.
Firstly, we need to scale down the geometry as its a big so simulation time will be huge, so we re-scaled to 0.001.
Boundary condition
Make the Gas simulation as Default
Global Transport Parameters - make it default
reaction mechanicsm
Simulation time parameter
Solver Parameter
Regions and Initializations
Turbulemce Modelling
Case I
- dx = dy = dz =2e-3m
Base Grid
Boundary Conditions
Now we need to run the simulation using Cygwin using the commands
We use converge to convert the files to paraview readeble files
In paraview the .vtm files is opened and click apply
the CAD in paraview
the velocity contour
The Pressure contour
Line plot showing mass flow rate
Total Cell Count
Average velocity at outlet
Static Pressure at Boundary
************************************************Case 2 *********************************************************
- dx = dy = dz =1.5e-3m
Velocity Magnitude
Pressure
Line graph showing mass flow rate
Average velocity at outlet
Total pressure at outlet
Total Cell count
*********************************************CASE 3 ************************************************************
dx = dy = dz =1.0e-3m
results
velocity
Pressure contour
Velocity at outlet
Pressure At outlet
Mass flow rate at boundary
Total cell count
Also explain where and why separation is taking place in detail.
The separation of the air flow takes place at the point where the area of the cross-section increases, that is at the edge inside the box
thank you