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Turbulence Modeling

By Prof. Vagesh D. Narasimhamurthy   |   IIT Madras
Learners enrolled: 437   |  Exam registration: 68
ABOUT THE COURSE:
Most fluid flows in industry and in nature are turbulent. For example, atmospheric and oceanic flows are turbulent, combustion in an aircraft or IC engine is turbulent, and even human breathing is turbulent. Laboratory experiments of turbulent flows are difficult, expensive and many times impossible! For example, how to measure airflow in a human lung or measure tomorrow’s weather?! Modeling turbulence, therefore, is a pragmatic approach to solve industrial flow problems and understand physics of the fluid flow. This course aims at building fundamentals/theory of various turbulence modeling techniques (from statistical to eddy-resolving methods), their advantages and challenges while implementing them in a computer program or CFD application software.

PREREQUISITES: PG level fluid mechanics and basic CFD knowledge

INDUSTRY SUPPORT : ANSYS, GE, Airbus, Altair, ESI, Tata motors, Bajaj Auto, TCS, Boeing, DRDO, ISRO, HAL, CSIR (NAL, SERC), Shell, Reliance petroleum, ONGC, GAIL, etc.
Summary
Course Status : Completed
Course Type : Elective
Language for course content : English
Duration : 12 weeks
Category :
  • Mechanical Engineering
Credit Points : 3
Level : Undergraduate/Postgraduate
Start Date : 22 Jul 2024
End Date : 11 Oct 2024
Enrollment Ends : 05 Aug 2024
Exam Registration Ends : 16 Aug 2024
Exam Date : 02 Nov 2024 IST

Note: This exam date is subject to change based on seat availability. You can check final exam date on your hall ticket.


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Course layout

Week 1:  Introduction to turbulence theory, statistical analysis (random process, ensemble mean, variance, single- and multi-point statistics, spatial and temporal correlation)

Week 2: Cartesian tensors, governing equations of fluid motion, Reynolds averaged Navier-Stokes (RANS) equations, turbulence closure problem

Week 3: Equation for fluctuating fluid motion, Reynolds stress transport equation, statistical stationarity and statistical homogeneity

Week 4: Turbulence kinetic energy equation; turbulence characteristics: diffusive, dissipative and redistribution; mean kinetic energy equation and turbulence production

Week 5: Turbulent boundary layer: outer layer and inner layer, inertial and viscous sub-layers, inner scaling

Week 6: RANS modeling: Boussinesq approximation, eddy-viscosity, zero-equation modeling, two-equation modeling, standard k-ε model, model constants

Week 7: RNG k-ε model, one-equation modeling, k-ω models, wall-functions

Week 8: Low-Reynolds number (LRN) models, ε boundary conditions, Initial conditions

Week 9: Realizability constraints, Reynolds stress models (RSM): pressure strain-rate modeling (slow and rapid parts), wall-correction, algebraic stress models

Week 10: Direct numerical simulation (DNS), Kolmogorov hypothesis, large eddy simulation (LES): resolved and sub-grid scales, filtered Navier-Stokes equations

Week 11: Filter types, sub-grid scale (SGS) modeling: Smagorinsky model, one-equation kSGS model, dynamic Smagorinsky model

Week 12: Scale similarity models, grid convergence in LES, hybrid RANS-LES approach, detached eddy simulation (DES)

Books and references

Turbulent Flows – Stephen B. Pope
An Introduction to CFD: The Finite Volume Method – Versteeg & Malalasekera
Modelling Turbulence in Engineering and the Environment: Second-Moment Routes to Closure – Kemal Hanjalic & Brian Launder
Turbulence Modeling for CFD – David C. Wilcox

Instructor bio

Prof. Vagesh D. Narasimhamurthy

IIT Madras
Prof. Vagesh D. Narasimhamurthy is a Professor at the Dept of Applied Mechanics, IIT Madras. He specializes in direct numerical simulations (DNSs), turbulence and combustion modeling, and particulate interactions in turbulence. Before joining IIT Madras, he was a Senior Research Engineer at Gexcon, Norway for five years. During that period, he was part of the core R&D team developing the commercial CFD software FLACS, which models gas-explosion and gas-dispersion problems for industrial safety. He has a PhD in Fluids Engineering from Norwegian University of Science and Technology (NTNU), Norway, and MS in Computational & Experimental Turbulence from Chalmers University of Technology, Sweden, and BE in Mechanical Engineering from Bangalore Institute of Technology.

https://home.iitm.ac.in/vagesh/

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: November 2024 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.

CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Madras. It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team


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