Flowbench Simulation for Intake Port

1. Geometry:

All dimensions in mm.

2. Boundary Conditions:

Total pressure inlet = 4 bar

Static pressure outlet = 1 bar

Real wall = all inner surfaces of the cylinder, valve, and intake.

3. Grid dependence study:

Goal (Value)	Design Point 1	Design Point 2	Design Point 3
Level of initial mesh (Automatic Mesh)	4	5	6
Level of Refining Fluid Cells (Local Mesh 2)	3	3	3
Level of Refining Fluid Cells (Local Mesh 3)	2	2	2
Level of Refining Fluid Cells (Local Mesh 4)	2	2	2
GG Max Velocity 1 [m/s]	472.10	505.70	513.55
SG Mass Flow Rate 1 [kg/s]	-0.11	-0.11	-0.12

The maximum velocity increases as we refine the mesh and so does the mass flow rate. This clearly means that the truncation errors present in Design Point 1 wrt Design Point 3 is very large as compared with errors present in Design Point 2 wrt Design Point 3.

Both the Maximum Velocity goal and Mass flow rate goal were used in convergence. Based on the above data Design Point 2 i.e. with Initial Mesh level 5 is the best keeping in mind the computation resources available, rate of convergence and accuracy.

4. Effect of Valve lift on Mass Flow Rate:

Valve lift was varied from 1 mm to 8 mm with 7 intervals in between. The following results were obtained:

Complete Data of the Parametric study:

https://drive.google.com/open?id=1IuOb05V7SBMk5ccI7vW2ebd4TmKuwwi2

It is observed that the mass flow rate first increases linearly with the valve lift and then attains a constant value after a certain point.

5. Pressure loss in Intake:

https://drive.google.com/open?id=1HNGydEvlrftuva9VVcTjA2ZXbGFWO8Cs