Butterfly is used in industry to regulate the flow of fluid. Here is some of the college analysis.........

1. 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

3. INTRODUCTION
Buttery valves are commonly used to control fluid flow inside
of piping systems. A buttery valve typicallyconsists of a metal
disc formed arounda central shaft, which acts as its axis of
rotation. As a buttery valve is rotated open, fluid is able to
more readilyflow past the valve. Butterfly valves are
commonly used in industrialapplicationsto 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 inclineddisc which is fixed at an angle of about
30 degree from the vertical. Instead of rotating disc we have
taken fixed disc so that analysiscould 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

4. PRODUCT
We have the product i.e. Butterfly Valve in CATIA. The
product consist of one hollowcylinder and one disc. Fluid
flow through cylinder which can be treated as the inlet of the
valve. Disc is inclinedat an angle of about 30 degree with the
vertical. Flow through the valve is mainly controlledby 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

5. PROCESS INVOLVED IN
ANSYS:
GEOMETRY:
The valve created in CATIA is imported in ANSYS by the
import optionin the geometry menu. The imported product
should have enclosure from which fluid will flow. Since the
valve pipe is cylindricalin shape so we chose cylindrical
enclosure option.The process involvedis shown as follow:
ANSYS  FLUENTGEOMETRY IMPORT GEOMETRY 
TOOLS ENCLOSURE CYLIDRICAL ENCLOSUREUPDATE
Followingthe above process leads to creation of the product
and enclosure.
FIG : IMPORTED GEOMETRY WITHOUT ENCLOSURE

6. Fig: imported geometry with cylindrical enclosure.
MESHING:
The imported geometry is meshed so that the load is
calculatedat each mesh. This can be done by the following
process:
ANSYS FLUENT MESHINGSELECTMESH SIZE (FINE)
MESH TYPE (SMOOTH) CREATE MESHCREATENAMED
SELECTION ON BOTH SURFACE OF CYLINDER (by right click on
surface) INLET AND OUTLET NAMED.

7. Fig: meshing of all the surfaces.
Mesh report for the following product is given below
Table 2. Mesh Information for FFF
Domain Nodes Elements
Part body 14427 63329
solid 29399 134232
All Domains 43826 197561
The mesh report is directly taken from the ANSYS.

8. SET UP:
After meshing the product is providedthe certain constraint
or the conditionso 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 – laminarand viscous
Material – Solid(aluminium) and Liquid(air).
 Boundary Condition  Inlet(velocity-2m/s& presure-
3atm)
 Reference value calculatefrom inlet.
 SolutionInitialization initializefrom inlet.
 Number of iteration is 50
Remaining items should be left as default without changing.
After all the setup is completed then calculationis being run.
Then the graph of iterationis 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

9. Table 4. Boundary Physics for FFF
Domain Boundaries
Part body
Boundary - 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
RESULT
The result for the above problem is calculatedby drawing
several contours, velocity diagram, pressure diagram and
calculatingor analysing various parts of the graph or
contours. This can be done by followingsteps 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.

11. Fig.: Velocity vector plot
In the above figure shows flow direction vector and the chart
beside it shows the magnitude of velocity.
STREAMLINE FLOW

12. 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

13. Velocity contours represents what velocitywill 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.

14. Fig: Pressure contour for the back surface.
CONCLUSION
Thus 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__