Modelling and simulation of flow through a flowbench

AIM:

Create a 3D model of a flow bench and run flow analysis and Obtain a plot of lift vs mass flow rate.

We need to do the following

• Grid dependence test.
• Effect of valve lift on mass flow rate.

DIMENSIONS:

bore diameter=100mm

length = 200mm

GRID DEPENDENCE TEST:

we run the simulation at different at different redifining level ie at 2,3,4. Redifining level divide the model into small small parts. on incresing the redifining level , the small parts called as element increses.We run the simulation at 2,3 and 4 mesh redifining level with valve lift of 10mm.

AT MESH LEVEL 2:

AT MESH LEVEL 3:

AT MESH LEVEL 4:

For the same total and inlet pressure and at the same valve lift of 10mm, there is different velocity varation.

From above models,we find that ,with increase in mesh level the pressure also increases .

At mesh level 2 :mass flow rate is -0.00255878kg/s & iteration:40

At mesh level 3: mass flow rate is -0.00141029kg/s & iteration:40

At mesh level 4:mass flow rate is -0.000133499kg/s & iteration:44

we also find that with increase in mesh level ,mass flow rate decrease .

From above we conclude that mesh level at 4 give better result and do parametric study at mesh level 4 with lift valve of 10mm.

EFFECT OF VALVE LIFT ON MASS FLOW RATE:

Taking mesh level 4 and valve lift from 1mm to 8mm with each 1mm lift ,we set our range and get the plot.

**THE ABOVE TABLE SHOW THE VARATION OF MASS FLOW RATE FOR DESIGN POINTS AT SAME MESH LEVEL 4 .

** THE DESIGN POINT 1,2,3,4,5,6,7 CONDUCT PARAMETRIC STUDY AT VALVE LIFT BETWEEN 1MM TO 8MM .

** THE PLOTS OF MASS FLOW :