Week 4.2: Project - Transient simulation of flow over a throttle body

AIM

To Determin Transient Simulation OF Elbow with variable valve Position Using Converge

INPUT

BOUNDARY CONDITION

Predefine mixture-Air

Simulation Parameter

Solver: Steady-state

Simulatio mode- Fully Hydrodynamic

Simulation Time Parameter

End Time-0.01 S

Init-time step-1e-09 s

min-time step-1e-09 s

Max-time step-1

Max-Convection CFL-1

Time output calculation

# time step
v=200 
l=0.2
#Flow rate
dt=l/v
t=10*dt

print('End Time=',10*dt)
#number of file needed for output
nt=50
dtn=t/nt
print('Time interval 3D output=',dtn)

Solver Parameter

Convection CFL in Final Stage-0.5

BOUNDARY

INLET PRESSURE:1.5e5 Pa

OUTLET PRESSURE:1e5Pa

Throttle-wall

motion type: Rotating

Surface movement: moving

Setting Trottle as referance

Profile moving

0 S=0

0.002S=25

0.004S=25

0.008S=0

wall-wall

Region & Intialisation

Create Region Species-air

Grid Controls

Base Grid-0.02

Fixed Embedding

Entity type-Boundary

Boundary ID-Throttle

mode-Permanant

Scale-1

Embadded Layer-2

for Fine layer in around Throttle

run setup with no hydrolic condition to check the solution

OUTPUT

valve mesh motion

slice with function of time

MASS FLOW outlet

Pressure outlet

Velocity outlet

Pressure contour

Velocity contour

Total elbow physics Effect

Valve motion Effect Contour varation

Conclution

Transient flow valve motion analysis is Done using Converge

Higher Pressure loss in flow from initial 0.001 to 0.004 S after 0.006 s that there is an increase in pressure this is due to effect of thottle motion and flow become almost reaching steady in flow

The effect of Pressure and velocity loss is clearly view in contour in effect of Thottle where flow seperation accours so there is variation of physics