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

Aim:

Setup and run transient state simulation for flow over a throttle body.

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.

Also show the calculations on how you calculated an end time for the simulation.

Create an animation in which it throttle movement should be visible.

• Upload an animation on You tube and provide the You tube link for an animation in your report.

Introduction:

The throttle body is an important part of the air intake system that controls the air flowing into the engine. It’s located between air intake and engine manifold where fresh air is pulled into the engine for the combustion process. The amount of air allowed into the engine during this process controlled by the butterfly valve. The butterfly valve is a pivoting flat valve controlled by the gas pedal via cable or wire if controlled electronically. When pressing the peddle, the throttle body opens to allow more air flow into the manifold. The computer inside the vehicle works with sensors to ensure that the engine receives the perfect balance of fuel and air.

Filth, carbon, and dirt can build up in the housing creating problems with air flow. Known as coking, the normally smooth service for air to travel becomes full of gunk and creates an imbalance. This interrupts that perfect mixture of air and fuel which can cause the butterfly valve to get stuck. A stuck valve can cause surging or even stalling. This is why it’s important to have a good air filter for the vehicle. A fresh filter helps prevent dirt buildup on the surface of the butterfly valve. Poor idling or stalling when coming to a stop is another sign that may have an issue with the throttle body.

Modelling the problem in Converge Software

The 3D model is imported in the software.