Modeling and simulation of flow through a flowbench

Objectives:

• Grid dependence test
• For three grids running the simulation at a particular valve lift and explain your results
• Observing the effect of valve lift on the mass flow rate

Introduction:

The primary objective of this challenge is to model a simple valve and port and find out outflow velocity, pressure, and the mass flow rate is affected by different valve lifts. A secondary is to perform a grid dependency test for a particular valve lift and explain the results.

Procedure:

Create a valve port and valve. The valve can be self-designed or can be recreated from another design. The valve being tested here is a generic valve taken from a journal. Physical Dimensions attached in the picture.

Make sure that the Drawing is done in such a way that the valve lift can be varied sequentially.

Boundary Conditions:

• total pressure at inlet: 5 Bar
• Static pressure outlet: 1Bar

ALL CASES MASS FLOW RATE TABLE:

	Design Point 1	Design Point 2	Design Point 3
Valve opening [m]	0.001	0.0015	0.002
GG Bulk Av Static Pressure 1 [Pa]	133260.0971	126868.3267	122984.574
SG Mass Flow Rate 1 [kg/s]	0.018600403	0.023782218	0.02563835

Design Point 1:Valve opening [0.001 m]:

• Pressure Plot:
• velocity Plot:

Design Point 1:Valve opening [0.0015 m]:

• Pressure Plot:
• Velocity Plot:

Design Point 1:Valve opening [0.002 m]:

• Pressure Plot:
• Velocity Plot:

Comparision :

• Conclusion:

• As the valve lift increases the mass flow rate also increases and the velocity of air is proportional to the increase in mass flow rate thus decrease in pressure.