PROJECT ON

ANALYSIS OF BUTTERFLY VALVE IN ANSYS

BY:

MANISH KUMAR -2013JE0499

Under the Guidance of :

Dr. Shibayan Sarkar,

Assistant Professor,

Dept. of Mechanical Engineering

ISM Dhanbad

INTRODUCTIONButtery valves are commonly used to control fluid flow inside of piping systems. A buttery valve typically consists of a metal disc formed around a central shaft, which acts as its axis of rotation. As a buttery valve is rotated open, fluid is able to more readily flow past the valve. Butterfly valves are commonly used in industrial applications to control the

internal flow of both compressible and incompressible fluids.In our case, we have taken a cylinder from which fluid flows. And a central inclined disc which is fixed at an angle of about 30 degree from the vertical. Instead of rotating disc we have taken fixed disc so that analysis could be easier and consume less time. And also instead of taking water as a fluid we have

taken air as a medium to flow.

INDUSTRIAL APPLICATION OF BUTTERFLY VALVE

PRODUCTWe have the product i.e. Butterfly Valve in CATIA. The product consist of one hollow cylinder and one disc. Fluid flow through cylinder which can be treated as the inlet of the valve. Disc is inclined at an angle of about 30 degree with the vertical. Flow through the valve is mainly controlled by the rotation of disc about its axis. If the disc makes 0 degree with the vertical then fluid is not able to pass the valve while if the vale disc is makes 90 degree with the vertical then most of the fluid passes the valve. And in between fluid is partially able to flow through the valve. So we can say butterfly valve is generally used to control the flow of fluid in any pipe.

BUTTERFLY VALVE VIEW IN CATIA

PROCESS INVOLVED IN ANSYS:GEOMETRY:The valve created in CATIA is imported in ANSYS by the import option in the geometry menu. The imported product should have enclosure from which fluid will flow. Since the valve pipe is cylindrical in shape so we chose cylindrical enclosure option. The process involved is shown as follow:

ANSYS FLUENTGEOMETRY IMPORT GEOMETRY TOOLS ENCLOSURE CYLIDRICAL ENCLOSUREUPDATE

Following the above process leads to creation of the product and enclosure.

FIG : IMPORTED GEOMETRY WITHOUT ENCLOSURE

Fig: imported geometry with cylindrical enclosure.

MESHING:The imported geometry is meshed so that the load is calculated at each mesh. This can be done by the following process:

ANSYS FLUENT MESHINGSELECT MESH SIZE (FINE) MESH TYPE (SMOOTH) CREATE MESHCREATE NAMED SELECTION ON BOTH SURFACE OF CYLINDER (by right click on surface) INLET AND OUTLET NAMED.

Fig: meshing of all the surfaces.

Mesh report for the following product is given below

Table 2. Mesh Information for FFF

Domain NodesElements

Part body 14427 63329

solid 29399 134232

All Domains 43826 197561

The mesh report is directly taken from the ANSYS.

SET UP:After meshing the product is provided the certain constraint or the condition so that the product could be analysed. The constraint given are as follow:

General set up :- Type – Pressure based.

Velocity – Absolute velocity.

Time – Steady.

Models – Flow – laminar and viscous Material – Solid (aluminium) and Liquid (air).

Boundary Condition Inlet(velocity-2m/s & presure-3atm)

Reference value calculate from inlet. Solution Initialization initialize from inlet. Number of iteration is 50

Remaining items should be left as default without changing. After all the setup is completed then calculation is being run. Then the graph of iteration is obtained. And the set up file is done. Report for the setup is given below.Table 3.  Domain Physics for FFF

Domain – part body

Type solid

Domain - solid

Type cell

Table 4.  Boundary Physics for FFF

Domain Boundaries

Part bodyBoundary - contact_region src

Type INTERFACE

solid

Boundary - contact_region trg

Type INTERFACE

Boundary - inlet

Type VELOCITY-INLET

Boundary - outlet

Type PRESSURE-OUTLET

Boundary - wall solid

Type WALL

RESULTThe result for the above problem is calculated by drawing several contours, velocity diagram, pressure diagram and calculating or analysing various parts of the graph or contours. This can be done by following steps or method.

Velocity vector: The velocity vector gives the flow direction of the fluid. It also shows how much of the fluid will pass and how it passes by same velocity or with increment in velocity.

Fig.: Velocity vector plot

In the above figure shows flow direction vector and the chart beside it shows the magnitude of velocity.

STREAMLINE FLOW

Streamline is just represent same as that of the vector flow except one difference that is vector has dotted lines while the streamline has a continuous line.

VELOCITY CONTOURS:

Fig: velocity at different portion of the valve in different views

Velocity contours represents what velocity will impact on which portion of the product. As shown in the figure above as the intensity of colour increases in the blue region the velocity decreases which means dark blue region has less velocity compared to green region.

PRESSURE CONTOURS

Fig: Pressure contour for the front surface

Pressure contours represents how much pressure will be impacted on which portion of the body. The surface which is shown in Red is having more pressure concentration than the green portion.

Fig: Pressure contour for the back surface.

CONCLUSIONThus we analysed the butterfly valve using various variables like pressure, velocity, fluid, etc. And we also have noted the angle alignment is the key player in controlling the flow through the valve.

THE END__