Week 4.2: Project - Transient simulation of flow over a throttle body
Aim: To perform throttle flow simulation using Converge using transient state solver and post processing the results using Paraview.
Case performed:
dx=dy=dz=0.004m
Geometry used for simulation
Elbow, throttle, Inlet and outlet boundaries given
Setup:
Application: Time-Based
Materials used:
Species-Air (O2, N2)
Simulation Parameter:
Run Parameter: Transient-state solver | Time based simulation | Full Hydro. | Compressible
Start time: 0.0
End time: 0.008
Initial time step/min time step: 1e-08
Max time step: 1s
Max CFL limit(Convection/Diffusion): 1.0/2.0
Solver Parameter:
PISO – Naviar stokes solver scheme
Boundary Conditions:
Inlet- Pressure - 150000 Pa, 300K, Air(Species)
Outlet- Pressure- 100000Pa, 300k, (Species)Air
Elbow wall- stationary, fixed, 300k, Zero Normal Gradient for Turbulent kinetic energy boundary condition
Throttle Wall: Rotating, moving, Rotation center points, rotate about points given
300k, Zero Normal Gradient for Turbulent kinetic energy boundary condition
Initial Conditions/Regions:
Pressure: 101325Pa, 300K
Turbulence Initialization
Species- Air(O2,N2)
Turbulence Model:
RANS_K_EPS model used
Grid control:
Base grid: dx=dy=dx=2e-4m
Total cell count of cells present in the mesh peaked at about 32500.
Mass flow inlet
The mass flow varies regularly and decreases to about -.064 kg/s.
Mass flow outlet
The mass flow varies and reaches about 0.065kg/s at the end of the end time.
Static Pressure inlet
The pressure value varies continuously and reaches close to 122000Pa by the end of end time.
Total Pressure outlet
The total pressure varies continuously and increases to about 136000 Pa by the end of end time.
Average velocity inlet
The average velocity shows continuous variation and reaches close to -180m/s by the end of end time.
Average velocity outlet
The average velocity varies regularly and increases to about 230m/s by the end simulation.
Velocity Contour
The velocity contour shows low velocity magnitude after the throttle flow valve.
Pressure Contour
The pressure contour represents high pressure before the throttle valve and low pressure after the throttle flow valve area.
Youtube animation link: