Week 4: Project - Steady state simulation of flow over a throttle body

AIM: To perform steady state simulation for flow over throttle body having mesh size dx = 2e-3m, dy = 2e-3m & dz = 2e-3m and achieve the below enclosed objectives.

• Post process the results and show pressure and velocity contours.
• Show the mesh (i.e surface with edges)
• Show the plots for pressure, velocity, mass flow rate and total cell count.
• Create an animation in which it throttle movement should be visible.

METHODOLOGY OR CASE SETUP:

Introduction:

A throttle is a device used to control the fluid flow especially in engines sto regulate the amount of fuel or the air. In this simulation the fluid flow over a throttle valve is studied at steady state.

1. Geometry

Application Type = Time-based

2. Mesh

• dx = 2e-3m, dy = 2e-3m, dz = 2e-3m

3. Material: Air

4. Time parameters:

Steady state solver with simulation end time of 15000 cycles and other parameters are shown below.

4. Boundary Conditions:

Wall:

Throttle valve:

Inlet:

Outlet:

5. REGIONS AND INITIALISATION

Air present at 300K and 101325 Pa

6. GRID Size

7. TURBULENCE MODELLING

8. POST VARIABLE SELECTION

9. OUTPUT FILES

RESULTS AND DISCUSSION

Grid Size

Velocity

https://youtu.be/omQ8XMs4wcQ

Pressure

https://youtu.be/1wHiPZsDGRI

Velocity Vector

Velocity Streamlines over Throttle valve

Inference: Streamlines refer to the path taken by particles of fluid under steady flow. If flow lines are curve then the tangent at any point on the curve gives the direction of the fluid velocity at that point.

Line Plots

1. Mass Flow Rate

2. Total Pressure

The Total Pressure is the sum of the Static Pressure and the Dynamic Pressure.

3. Static Pressure

4. Average velocity

5. Total Cells

Inference:

It is envisaged from the plots that as mesh is made finer the valve contour is more explicit and accurate results are observed. By using fixed embedding feature the flow over the throttle valve is made more accurate due to the refinement of mesh along the throttle position. Pressure is high at the region where the flow hits the throttle valve and Pressure behind the throttle valve is reduced due to the formation of low pressure region or drop in static pressure.

CONCLUSION: The study of fluid flow over throttle valve using Converge CFD was simulated successfully.