Week 9:Super Charger Simulation Project

Aim:

• Get Supercharger performance data (i.e total pressure ratio vs mass flow rate)
  • Array of Pressure Ratio = [ 1.1 1.5 2.0 2.2]
  • i.e for these 4 values of Pressure ratio get the mass flow rate and plot the graph between the total pressure ratio and mass flow rate for these 4 values.

• Compare results with and without total_energy_solver

• Check if mass is conserved.
  
  • Make use of MS EXCEL to check whether mass is conserved or not.
  • Import the data of mass flow rate at Inlet and Outlet and add them up.
  • After adding, ideally it should be zero for mass to be conserved but it will not be exactly zero.
  • The difference should not be more than 2e-4 kg/s.

Geometry:

The Super charger geometry was imported into the Converge and then the cad clean up and diagnosis was done.

Grid Control:

• Element size:dx = 0.002m, dy = 0.002m & dz = 0.002m

Case setup:

• Application: General Flow
• Solver: Transient solver
• Simulation type : Gas
• Material: Air
• Species: O2 and N2
• Simulation mode: Full hydrodynamic
• Simulation time parameters:
  Start time:0 sec
  End time: 0.01 sec
• Region & Initialization:
  Created a region for initializing the setup
• Boundary conditions
  Inlet - Inflow - Pressure -1 bar at 300k
  Outlet - Outflow - Pressure - 1.1,1.5,2 and 2.2 at 300k
  Left lobe - Wall - Rotating wall - 216000deg/s, centre 0 @z axis.
  Right lobe - Wall - Rotating wall - 216000deg/s, centre of left lobe @z axis.
  Casing - Wall - Law of wall @300k
• Turbulence Model - K epsilon
• The time interval for writing 3D output data files: 6e-5 sec
• The time interval for writing text output:1e-6 sec
• The time interval for writing restarting output:6e-5
• Maximum number of restart file saved:3

Results:

Total cell count:

Temperature:

Mass convergence:

Performance report:

Conclusion:

Supercharger simulation was done successfully.