Steady State Simulation of Flow over Throttle Body

Geometry:

Pipe with a throttle at the centre

Setup:

Inlet Pressure: 1.5 bar, Outlet Pressure: 1.0 bar, Temperature: 300 K

Cycles: 15000, Base Grid: 0.002

Fixed Embedding Scale of 3 and 2 Layers for the Throttle boundary ID.

Time Step Info:

1e-09	dtstart
1e-08	Dt
1.0	dt_max
1e-09	dt_min

Meshing:

Fig 1: Proper meshing with fixed embedding at the throttle

Fig 2: Detailed figure showing fixed embedding effect

Results:

Observed Velocity:

Fig 3: Velocity profile for the setup showing crticial flow values at throttle

Fig 4: Velocity vetors showing the direction of the flow

The velocity vectors and the values observed say 320 m/s show a maximum at the throttle and body interface. As the gap is small in that area between (passages) that too at convex end, it resulted in maximum velocity value at the inner curve of the body.

Observed Pressure:

Fig: Pressure observed over the throttle body

The pressure is high at the striking point of the inflow onto the throttle body. Due to the surface contour lift occurs and a low pressure is observed at the azimuth point and the point where the flow is with high velocity.