Week 10: Proportional Valve simulation

Proportional Valve Simulation

Introduction:

Proportional vavle provides the change in output pressure in the same ratio as the change in inlet pressure.

For example: If the input doubles then the output will also double.

Aim:

To perform a simulation in proportional valve,

• 3 cases without Adaptive Mesh Refinement (AMR)
  • Lift = 3 mm
  • Lift = 4 mm
  • Lift = 5 mm
• 3 cases with Adaptive Mesh Refinement (AMR)
  • Lift = 3 mm
  • Lift = 4 mm
  • Lift = 5 mm
• Run the case with FSI model and show the results.

Geometry:

The proportional valve geometry was imported in to the Converge and Diagnosis was done.

Case 1:

Case Setup:

• Application: General Flow
• Solver: Steady state solver
• Material: Air
• Species: O2 and N2
• Simulation mode: Full hydrodynamic
• Simulation time parameters:
  Start time:0 Cycles
  End time:15000 cycles
• Steady state monitor is enabled.
• Region & Initialization:
  Created a region for initializing the setup
• Boundary conditions
  Inlet - Inflow - Pressure - 30 bar
  Outlet - Outflow - Pressure - 101325 pa
  Valve spindle - Wall - Law of wall
  Casing - Wall - Law of wall

• Grid Control:

  • Element size:dx = 0.004m, dy = 0.004m & dz = 0.004m
• AMR is enabled
• Turbulence Model - K epsilon
• The time interval for writing 3D output data files: 100 cycles
• The time interval for writing text output:1e-6 sec
• The time interval for writing restarting output:100 cycles
• Maximum number of restart file saved:3

Results:

Velocity :

Without AMR:

With AMR:

Masflow rate :

Without AMR:

With AMR:

Pressure :

Without AMR:

With AMR:

Pressure Force:

Without AMR:

With AMR:

Comparison of without & with AMR

When we compare the result of mass flow rate, velocity, pressure force & total pressure without & with AMR though we have the same value this because of the SGS value which we have used in AMR but with AMR we are getting an actual physics flow because as we know the more we refined the mesh the more accurate results we get.

Case : 2:

In this case, we have carried out a Transient-state simulation with the FSI model & without AMR in order to see valve dynamics as inlet pressure changes.

The geometry part of this case is similar to the above case.

Case Setup:

• Application: General Flow
• Solver: Transient solver
• Material: Air
• Species: O2 and N2
• Simulation mode: Full hydrodynamic
• Simulation time parameters:
  Start time:0 Sec
  End time:1.6 Sec
• Region & Initialization:
  Created a region for initializing the setup
• Boundary conditions
  Inlet - Inflow - Pressure - input_pressure.in
  Outlet - Outflow - Pressure - 101325 pa
  Valve spindle - Wall - Law of wall
  Casing - Wall - Law of wall

• Grid Control:

  • Element size:dx = 0.004m, dy = 0.004m & dz = 0.004m
    
• Turbulence Model - K epsilon
• The time interval for writing 3D output data files: 0.016 sec.
• The time interval for writing text output:1e-6 sec
• The time interval for writing restarting output:0.016 sec
• Maximum number of restart file saved:3

Intake pressure profile:

Results:

Position plot:

Force acting on Spindle valve:

Contour:

Conclusion:

Proportional valve simulation was performed successfully.