Week 11: FSAE Car Project

FSAE Simulation

Aim:

Phase - 1:

• To Cleanup the 48 errors
• To Flag the front wings, rear wings, tyres, suspension links as separate boundaries
• To Create a virtual wind tunnel
• To run a virtual wind tunnel no-hydro test and a coarse simulation.

Phase 2:

• To perform a simulation for two different given condition

Race-1

• Racing track conditions - Lot of turns
• Average lap speeds - 45kmph
• 70% turns at 45 degrees
• 20% turns at 80 degrees
• 10% turns at 20 degrees

Race-2

• Racing track conditions - Straights
• Average lap speed - 75kmph

Solution:

Phase -1 :

Geometry before CAD clean up:

Geometry after CAD Cleanup

Boundary Flagging :

Wind Tunnel:

Phase - 2 :

Race - 1 :

Set up :

Refined Mesh

Application Type:-

• Time based

Material:-

• Gas simulation
• Global transport parameters
  1.Turbulent Prandtl number - 0.9
  2.Turbulent schmidt number - 0.78
• Species
  1.N2
  2.O2

Simulation Parameters:-

• Run Parameters
  1.Solver - Transient
  2.Simulation mode - Full hydrodynamic
  3.Gas flow solver - Compressible
• Simulation Time Parameters:
  1.Start time - 0 s
  2.End time - 5.2 s
  3.Initial time step - 1e-8 s
  4.Minimum time step - 1e-8 s
  5.Maximum time step - 1 s.
• Solver Parameters:
  1.Navier stokes solver scheme - PISO
  2.Navier stokes solver type - Density based solver
• Boundary Conditions :
  1.Inlet - Inflow
  Velocity -12.5m/s
  Species - Air
  2.Outlet - Outflow
  Pressure - 101325 pa
  Species - Air
  3.Symmetry - Symmetry
  4.Wall - Wall
  5.Body - Wall
  6.Rear wing - Wall
  7.Front Wheels - Wall
  8.Rear wheels - Wall
  9.Front wing right - Wall
  10.Rear wing right - Wall
  11.Front wing left - Wall
  12.Rear wing left - Wall
  13.Front supension right - Wall
  14.Front suspension left - Wall
  15.Rear suspension right - Wall
  16.Rear suspension left - Wall
  17.Floor - Wall
  18.Human - Wall
• Initial conditions and events:
  1.Initial pressure - 101325 pa
  2.Initial Velocity - 12.5m/s
  3.Initial Temperature - 300K
  4.Species - Air
• Physical Models:
  1.Turbulence modelling - RNG-K-epsilon
• Grid control:
  1.Base Grid - (x-0.32m) (y-0.25m) (z-0.25m)
  2.Fixed Embedding - Permanent.
  
  

Solution:

Race - 2 :

Refined Mesh

Application Type:-

• Time based

Material:-

• Gas simulation
• Global transport parameters
  1.Turbulent Prandtl number - 0.9
  2.Turbulent schmidt number - 0.78
• Species
  1.N2
  2.O2

Simulation Parameters:-

• Run Parameters
  1.Solver - Transient
  2.Simulation mode - Full hydrodynamic
  3.Gas flow solver - Compressible
• Simulation Time Parameters:
  1.Start time - 0 s
  2.End time - 5.2 s
  3.Initial time step - 1e-8 s
  4.Minimum time step - 1e-8 s
  5.Maximum time step - 1 s.
• Solver Parameters:
  1.Navier stokes solver scheme - PISO
  2.Navier stokes solver type - Density based solver
• Boundary Conditions :
  1.Inlet - Inflow
  Velocity -12.5m/s
  Species - Air
  2.Outlet - Outflow
  Pressure - 101325 pa
  Species - Air
  3.Symmetry - Symmetry
  4.Wall - Wall
  5.Body - Wall
  6.Rear wing - Wall
  7.Front Wheels - Wall
  8.Rear wheels - Wall
  9.Front wing right - Wall
  10.Rear wing right - Wall
  11.Front wing left - Wall
  12.Rear wing left - Wall
  13.Front supension right - Wall
  14.Front suspension left - Wall
  15.Rear suspension right - Wall
  16.Rear suspension left - Wall
  17.Floor - Wall
  18.Human - Wall
• Initial conditions and events:
  1.Initial pressure - 101325 pa
  2.Initial Velocity - 12.5m/s
  3.Initial Temperature - 300K
  4.Species - Air
• Physical Models:
  1.Turbulence modelling - RNG-K-epsilon
• Grid control:
  1.Base Grid - (x-0.32m) (y-0.25m) (z-0.25m)
  2.Fixed Embedding - Permanent.

Solution:

1.Velocity contour: