Parametric Study of Gate Valve

Objectives:

  • To perform a parametric study on the gate valve simulation.
  • To obtain the mass flow rates at the outlet for 5 design points.
  • To show the cut section view for different design points, and also to show the gate disc lift and fluid volume extraction.
  • To show the velocity contour animations for the design points.

Gate Valve:

A gate valve is also known as a sluice valve that opens by lifting a barrier (gate disc) through which the fluid is allowed to flow. Gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened. The gate faces can be parallel but are most commonly wedge-shaped (in order to be able to apply pressure on the sealing surface).

Geometry:

                               

The Gate disc is initially lifted to a height of 10 mm and Parameter set option is set, in order to get the simulation details at other design points. The other assumed Design points are 20, 30, 40, 50. The Geometry has been modified accordingly to get maximum fluid volume for simulation.

Modified geometry:

Fluid Extraction:

 

1. Cut section for 10 mm lift (Intitial Design Point):

Meshing:

Element size = 7 mm

Number of Nodes = 88727

Number of Elements  = 459671 

SIMULATION SETUP DETAILS:

I. SETUP PHYSICS

SOLVER

     Type --> pressure based

     velocity Formulation --> Absolute

     Time --> Steady

     Gravity - Tick the check box

     Gravitational Acceleration 

            X (m/s2) = 0

            Y (m/s2) = 0

            z (m/s2) = -9.81

MODELS

 Viscous --> k-epsilon 

        k-epsilon Model --> Reliazable

        Near-Wall Treatment --> Scalable Wall Functions 

MATERIALS

Click on Create/Edit Materials

Press Fluent Database

      Fluent Fluid Materials

       select - Water-liquid 

       Press copy

             Properties:

                 Density = 998.2 kg/m^3

                 Viscosity = 0.001003 kg/m-s

       press close.

ZONES

Cell Zones  

   Cell Zone Conditions

   click on volume-volume

   change Material Name -- water-liquid

   press Ok

MATERIALS

Click on Create/Edit Materials

Press Fluent Database

      Fluent Fluid Materials

       select - air

click on Delete

click on close.

ZONES

click on Boundaries

    inlet 

       change Type -  pressure inlet

       click on Edit

           Momentum 

               Gauge Total Pressure (pascal) = 10 

                click on Ok.

Default settings are maintained for interior-volume_volume, outlet, wall-volume_volume.   

II SOLUTION:

click on Definitions --> New --> Flux Report --> Mass Flow Rate 

         Name - Mass Flow Rate at outlet

         Boundaries - Outlet

         create

         Tick - Report File

         Tick - Report Plot

         Tick - Print to console

         Tick - Create Output Parameter

click on Ok.

INITIALIZATION

Method --> standard

Initialize at t = 0 

III RESULTS

GRAPHICS

 Contour --> New 

     Contour Name -- Velocity Contour

     options -- Filled

     contours of -->velocity

     click on New surface -- plane 

             Name - cutplane -x

             Tick - Point and Normal

              Points

              x0 (m) - 0

              y0 (m) - 0 

              z0 (m) - 0 

             Normal

             x1 (m) - 1            

             y1 (m) - 0 

             z1 (m) - 0 

        click on create

     surfaces - select cutplane -x

     click on save/Display

IV SOLUTION

ACTIVITIES 

Create --> solutions Animation

        Name - velocity animation

        Animation object --> Velocity Contour

        click on Ok.

RUN CALCULATON

Timescale Factor = 1

No. of Iterations = 250

 scaled Residuals:

Mass flowrate at Outlet:

The mass flow rate at outlet is -0.14930 kg/s

Velocity Contour:

Velocity Contour Animation (for a Gate disc lift of 10 mm)

2. Cut section for 20 mm lift (2 Design Point):

Mass flowrate at Outlet:

The mass flow rate at outlet is -0.2398 kg/s

Velocity Contour:

Velocity Contour Animation (for a Gate disc lift of 20 mm)

3. Cut section for 30 mm lift (3 Design Point):

Mass flowrate at Outlet:

The mass flow rate at outlet is -0.23978 kg/s

 

Velocity Contour:

Velocity Contour Animation (for a Gate disc lift of 30 mm)

 

4. Cut section for 40 mm lift (4 Design Point):

Mass flowrate at Outlet:

The mass flow rate at outlet is -0.42306 kg/s

Velocity Contour:

Velocity Contour Animation (for a Gate disc lift of 40 mm)

5. Cut section for 50 mm lift (5 Design Point):

Mass flowrate at Outlet:

The mass flow rate at outlet is -0.5901  kg/s

Velocity Contour:

Velocity Contour Animation (for a Gate disc lift of 50 mm)

Parameter Set:

Conclusion:

  • Negative sign for the mass flowrate indicates the flow is out of the control volume.
  • As the lift for gate disc increases the mass flow rate is increased.
  • But from 20 mm lift to 30 mm lift of gate disc there is no predominant variations in the mass flow rate.

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