Week 4.1: Project Steady state simulation of flow over a throttle body

OBJECTIVE:

We will be performing a stead-state simulation over a throttle body in an elbow and document our observations with velocity and pressure contours.

GEOMETRY:

The following geometry is used for simulation:

The geometry has some thickness to it so we will be removing the outer shell and the edges which creates the open edges:

We then use the patch tool to patch these open edges:

Patched Geometry:

BOUNDARY FLAGGING:

Inlet, outlet and Throttle:

Pipe Wall:

CASE SETUP:

Simulation Parameters:

We are using steady-state pressure based solver:

Boundary Conditions:

MESHING:

We use fixed embedding to improvise the mesh near the throttle:

RESULTS:

MESH:

Throttle Close Up:

CELL COUNT:

MASS FLOW RATE:

VELOCITY CONTOUR:

PRESSURE CONTOUR:

VELOCITY CONTOUR (THROTTLE):

PRESSURE CONTOUR (THROTTLE):

CONCLUSION:

• As the flow encounters the throttle, it moves around the throttle which causes a decrease in mass flow rate as depicted in the chart. The inlet mass flow rate increases while the outlet mass flows rate remains stagnant.
• The throttle clearly divides the elbow into a region of low pressure and high pressure as seen from the contours on the throttle as well as the pressure contours on the complete body.