18514707 analysis of naca2415 airfoil using fluent
TRANSCRIPT
BY
Mohammed Suhail
Nidhin C.
Rahul P.
Rupesh V.
Sandeep C. K.
Sajith P. P.
Sanesh N. K.
CFD enables one to study the dynamics of
things that flow with the help of computer
programs.
Gives results in detail in relatively short time
and is very cheap to use.
Can be used to solve big and complex
simulations which cant be simulated by wind
tunnel like atmospheric re-entry.
Commonly used for designing wings of small
single engine aircrafts.
It’s a laminar flow airfoil, hence is more
efficient than the conventional airfoil.
To find the change in lift acting on the airfoil
due to the change in angle of attack.
And to obtain the change in distribution of
pressure and velocity around the airfoil.
We used Spalart–Allmaras to solve the
turbulent fluid flow around the airfoil.
Spalart–Allmaras is a single equation model
specially used to solve the boundary layer fluid
around aerodynamic objects.
The velocity of air was kept steady at 0.2 mach.
Ambient temperature was kept at 300K.
Simulation was done at atmospheric pressure.
The grid used is shown:
The contours were checked for any abnormalities.
The wall y plus value was checked that whether it
lied inside 150.
It was seen that on increasing the angle of incidence
of the fluid the airfoil generated more lift.
But after a certain point the lift started to decrease
drastically.
-20
-10
0
10
20
30
40
50
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Drag Vertical
Lift Vertical
Static Pressure variation:
o AOA 6o
o AOA 10o
Variation of Velocity:
o AOA 6o
o AOA 10o
The applications of CFD are innumerable:
Automobile industry.
Aviation industry.
Space exploration.
Biomedical fields.
Weather prediction
Sports and recreational activities.
In design of buildings and structures.
Designing ships and submarines….
© Opportunities© Wide open market in terms of nature of
business/applications
© Broadly three sectors © CFD Developers
© CFD Application Engr.
© CFD Consultants
© Over 1000 CFD Companies/Research Centre's and Institutes in the world
© Always in Demand of experienced professionals
© 2- 3 billion USD market of s/w and consulting
© Annual growth rate of 25- 30 %
© Open source software OPEN FOAM
Product
Fluent, Star CD, Ansys MatrixCFD, ESI, Flowmerics, Zeus
Numerix, Tetrahedrix, Tridiagonol, Flowmaster, Transoft,COMSOL,etc..
Consulting
Infosys, Infotecg TCS, Wipro, Quantech, Pacific
Mindware, Transoft, Machwell, Neilsoft, COMSOL, Satyam, Sungrace, Flexio
n, Mahindra Engg, CADES, Onward, Bechtel, CSM , QuEST, Apramya….
Engineering
TATA, Ashok Leyland,Mahindra, Thermax, BHEL, Kirloskar, MICO, reliance
NTPC, Escort, Forbes Marshall, Maruti, Toyo Atlas, TVS, and all automotive
sector companies, etc
Design
John Deere, Eaton GE
JFWTC, Emerson, Cummins, GM, Whirlpool, SNECMA, Honeywell, Intel, Asu
s, Airbus, Boeing, Ford, TACO, Delphi , etc…
Enough opportunities in Private sector
Govt. design labs and research organizations
IITS, IISc, TIFR, BARC, ISRO, DRDO, ADA, ADE, NAL, HAL, VSSC and many
more smaller laboratories.
© Not so perfect (Approximation so not exact)
© Erroneous if inputs are incorrect (GIGO)
© Modeling of complex physics still a challenge
© Uncertainty- due to lack of knowledge( turbulence)
© Errors
© Modeling (Simplification)
© Truncation
© Discretization error
© Convergence
© Stability
© Consistency
© Expertise required to some level
© Vast and complex
Lift and drag forces increase with the increase
in angle of attack of the wing
On increasing the angle to a further 18o the lift
starts to drop and drag starts to increase
drastically.