Transient simulation of flow over a throttle body

OBJECTIVE:

  • Simulate Flow of fluid over a throttle body in converge studio and post-process the results.
  • Post process the results and show pressure and velocity contours.
  • Show the plots for pressure, velocity, mass flow rate and total cell count.
  • Create an animation in which its throttle movement should be visible.

SOFTWARE ENVOLVED:

  • Converge Studio
  • Cygwin
  • Paraview

PROFILE GEOMETRY:

                               

INITIAL BOUNDARY CONDITIONS:

  • The flow is general flow.
  • The air contains a predefined mixture of oxygen and nitrogen.
  • The pressure at the inlet and outlet is 1.5 and 1 bar.
  • The Prandtl and Schmidt no for the given profile are 0.9 and 0.78.
  • The no of the cycle performed is 15000.

MESH SIZE:

  • The base mesh grid is dx=dy=dz=0.004.
  • The fixed embedding has been done on the throttle valve, given the scale of 2 and no of the layer is  2. 

RESULTS:

After preprocessing and postprocessing the data using converge studio and paraview, the following results are as followed.

Base Mesh

                                                            (dx=dy=dz=0.004)

Pressure Contour

 

 

Velocity Contour

Total Cell Count

  • The total cell count around the whole geometry is 4200.

 

Total pressure plot

  • The plot defines the total pressure at the inlet is steady throughout the time interval.
  • The total pressure at the outlet gets an increase from 1 bar to 1.2bar around 0.001sec and gets further increase in the pressure up to 1.25, it attains the steady state after 0.006 sec

Average velocity plot

  • The plot defines the symmetry in the average velocity at the inlet and outlet boundaries.
  • Both the boundaries attain steady state after the 0.004 sec.

Mass flow rate

  • The plot defines the symmetry in the mass flow rate at the inlet and outlet boundaries.
  • Both the boundaries attain steady state after the 0.004 cycles.

 

Animations :

 

CONCLUSIONS:

  • Due to the fixed embedding of the throttle valve, the simulations near to it becomes clear as the number of cell count got increased in the specified region.
  • The velocity increases near the elbow valve since the area is less and pressure get dropped in the region which causes the velocity to increase.
  • The cell count gets change according to the valve rotation.
  • The pressure at the inlet is high as the fluid hits the valve the pressure gets drop on another side, as seen in the pressure contour.
  • The pressure on the throttle increase as the fluid hits it, which tend to decrease in the pressure since the throttle decreases the area of the cross-section as it rotates 25 degrees which let the drop in pressure and increase in the velocity of the fluid on another side.

 


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