Steady State Flow over a Throttle Body

Steady-state airflow simulation is carried out, inside of a throttle body with the valve completely open.

The geometry is an STL file, which is imported into converge studio and cleaned up.

The mesh size is 2e-3 metres in X, Y and Z respectively. For better visualisation of the flow around the valve, a fixed embedding of factor 3 (refines the base size by a factor of 3) for 2 layers is chosen.

Boundary conditions at Inlet is a pressure of 1.5 bar at 300K and that an outlet is 1 bar at 300K. This difference of 0.5 bar will drive the flow.

The geometry as seen with the wall opacity reduced in paraview.

Simulation Run time is 15000 cycles, with variable time steps. The minimum time step is 1e-9 and maximum of 1 seconds. The flow is compressible and pressure based steady-state solver is used.

Results

Mass Flow vs Cycles

Total Pressure vs Cycles

Average Velocity vs Cycles

Velocity Stream Lines over the Throttle Valve

The valve is coloured by the pressure distribution and the streamlines are velocity.

The behaviour is as predicted, with high-pressure regions on the right and low pressure on the left.