Challenge

Modelling and simulation of flow through a flowbench

Aim :- To create a 3D model of a flow bench and run flow analysis & to obtain the plot for lift vs mass flow rate.

Objective :-

create a 3D model of a flow bench and run flow analysis.
To obtain the plot for lift vs mass flow rate.
Run the grid dependence test, For three grids run the simulation at a particular valve lift and explain the results

Theory :-

An air flow bench is a device used for testing the internal aerodynamic qualities of an engine component and is related to the more familiar wind tunnel.
It is used primarily for testing the intake and exhaust ports of cylinder heads of internal combustion engines. It is also used to test the flow capabilities of any component such as air filters, carburetors, manifolds or any other part that is required to flow gas.

3D model of a flow bench :-

Flow Analysis :-

Case -1 ( Automatic Mesh Level 3 ) :-

For the mesh level of 3 the internal flow was calculated for the five different position of valve lift
The five different position are as follows :- 0.001 , 0.003 , 0.005 , 0.007 , 0.009 m
The Cut-plot and the flow trajectories for the five different valve lift is shown below

Case -2 ( Automatic Mesh Level 4 ) :-

For the mesh level of 4 the internal flow was calculated for the five different position of valve lift
The five different position are as follows :- 0.002 , 0.004 , 0.006 , 0.008 , 0.010 m
The Cut-plot and the flow trajectories for the five different valve lift is shown below

Case -3 ( Automatic Mesh Level 5 ) :-

For the mesh level of 5 the internal flow was calculated for the 10 different position of valve lift
The ten different position are as follows :- 0.001 , 0.002 , 0.003 , 0.004 , 0.005 , 0.006 , 0.007 , 0.008 , 0.009 , 0.010 m
The Mesh value of 5 was selected as the best mesh as the flow looks more smooth .
The Cut-plot and the flow trajectories for the ten different valve lift is shown below

Cut-Plot Observation :-

The change in the valve lift changes the mass flowing rate inside the cylinder
The flow seems to a very low when the valve is open to a 0.001m and a massive flow is seen when the valve is open upto 0.01m
The flow seems to be varying as the valve changes its lift
Also when the mesh is refined to greater level the flow looks more realistic and smooth
Thus the level 5 mesh values shows the smooth flow for each 0.001 change in valve lift

Explanation :-

Software used solid works 2016
Starting by modelling the 3D model for the flow bench
Using the proper dimensions and the extrude function to create a fully defined model
Now to start with the flow analysis
Providing the boundary conditions as total pressure at inlet as 400000 and static pressure at base lid/outlet as 100000 pa & running the base line simulation
Now to obtain the mass flow rate at different valve lift position will start with new parametric study and provide the dimensions to vary itself
For the three different mesh values we need to run the flow analysis for varying valve lift for each case
After the completion of parametric study we obtain the surface goal for the mass flow rate and the clut-plot for each case
Lastly obtained the graph or plot for the lift vs mass flow rate in each three mesh condition

Result :-

Thus we have studied the simulation of flow through a flow bench
Created the 3d model of the flow bench and ran the parametric study
Ran the grid dependency test for the three different grid/mesh values for the varying valve lift condition
Also plotted the graph for the lift vs mass flow rate for each case

Graph / Plot :-

For Case-1 ( mesh level 3 )

The valve lift were positioned at :- 0.001 , 0.003 , 0.005 , 0.007 , 0.009 m
The mass flow rate at each valve lift value is given below with the graph for the lift value vs the mass flow rate values for the case of automatic mesh level 3. is shown below

For Case-2 ( mesh level 4 )

In this case the valve lift were positioned at :- 0.002 , 0.004 , 0.006 , 0.008 , 0.010 m
The mass flow rate at each valve lift value is given below with the graph for the lift value vs the mass flow rate values for the case of automatic mesh level 4. is shown below

For Case-3 ( mesh level 5 )

In this case the valve lift were positioned at :- 0.001 , 0.002 , 0.003 , 0.004 , 0.005 , 0.006 , 0.007 , 0.008 , 0.009 , 0.010 m
The mass flow rate at each valve lift value is given below with the graph for the lift value vs the mass flow rate values for the case of automatic mesh level 5. is shown below

Conclusion :-

As the value for the valve lift increases the mass flow rate also increases as it depends on the area so as area increases mass flow rate also increase
The graph shows for the different mesh conditions the values obtained are negative
As the mass flow leaves the domain the values are considered as negative
The graph show that the mass flow rate is ranging betn the -0.1 to -0.3 ie in case 1 the graph lies at -0.1 to -0.3 and for case 2 it lies betn -0.15 to -0.3 so it is due to the change in the value lift values for the both case thus the combined graph is seen in the third case as the valve lift ranges from 0.001 to 0.01 m
It is also observed that as the value of lift increases to 0.008 and reaches max 0.01 the graph curve for that value slowly converts to a straight line
Thus the effect of valve lift to the mass flow rate is that as the valve opens more the flow increases accordingly

Ship work like this
in your own course.