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Flow Over a Backward Facing Step Aim: To perform flow over a backward facing step simulation using Converge-CFD and postprocess the result in Paraview. …
VENKATA AKHIL VARMA MANTENA
updated on 15 Sep 2020
Flow Over a Backward Facing Step
Aim: To perform flow over a backward facing step simulation using Converge-CFD and postprocess the result in Paraview.
Objective:
Run 3 simulations and compare the results between all the 3 simulations.
3 different base mesh sizes are,
Procedure:
Backward-facing step is a standard geometry used for visualizing the recirculation flow and validating turbulence models. BFS flow is one representative model for seperation flows, which is widely used in aerodynamic flows,condensers, vehicles etc. For this case backeard facing step is constructed using triangle commands on converge.
Case Setup:
Application Type = Time-based
Materials -
Predefined mixtures = Air
Select 'Gas Simulation' & 'Species(not in mech.dat)'
> Click on Species > select Gas > click on Add and select N2 &O2.
Simulation Parameters-
In Run Parameters two main things to be considered:-
(a.) select the following solver settings
(b.) Go to Misc. > uncheck UseSharedMemory and click on Steady-State Monitor .
Steady-State Monitor:-
Simulation Time Parameters-
Solver Parameters [Steady-State]-
Boundary Conditions-
Booundary:
Initial Conditions and Events:-
Regions and Initialization:
Physical Models:-
Uncheck Turbulence Modeling in this case.
Grid Control:-
Base Grid:
case-1 dx = 2e-3m, dy = 2e-3m, dz = 2e-3m
case-2 dx = 2e-3m, dy = 2e-3m, dz = 2e-3m
case-3 dx = 1.0e-3m, dy = 1.0e-3m, dz = 1.0e-3m
Post-Processing:-
Post Variable Selection:
Click on Typical Variables/Geometry > Select required variables.
Click on Species/Passive
Output Files:
>> Here path is copied from " C:ProgramFilesConvergent_ScienceCONVERGE3.0.15binconverge-intelmpi.exe ".
Geometry:
Case Setup:
Observations:
Case-1
Mesh sizes - dx =2e-3m, dy =2e-3m, dz =2e-3m
Velocity Contour:
Pressure Contour:
Velocity vectors:
Velocity Plot:
Pressure Plot:
Mass Flow Rate plot:
Cell Count plot:
Animation:
Velocity:
Pressure:
Case-2
Mesh sizes - dx =1.5e-3m, dy =1.5e-3m, dz =1.5e-3m
Velocity Contour:
Pressure Contour:
Velocity vectors:
Velocity Plot:
Pressure Plot:
Mass Flow Rate plot:
Cell Count plot:
Animation:
Velocity:
Pressure:
Case-3
Mesh sizes - dx =1.0e-3m, dy =1.0e-3m, dz =1.0e-3m
Velocity Contour:
Pressure Contour:
Velocity vectors:
Velocity Plot:
Pressure Plot:
Mass Flow Rate plot:
Cell Count plot:
Animation:
Velocity:
Pressure:
Results:
In the above vector plot, it is seen that some vectors are not in the direction of the flow. This mainly happens because of change in area. Near the step in the geometry, we can see the seperation of the flow. this is due to effect of boundary layer seperation.Due to the change in area there is a pressure drop, which leads to the seperation of the flow. The boundary layer seperation is a phenomenon which occurs when fluid experiances a sudden change in area or the path of the flow.
Conclusion:
The flow over a backward facing step using Converge CFD is performed. With different mesh sizes the accurate results are obtained. Various plots, contours, animations are generated. Also studied how the seperation of flow is taking place from the results obtained.
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