2nd Workshop on Computational Fluid Dynamics (CFD)

Abstract

The presentation will begin with a brief overview of Computational Fluid Dynamics (CFD). A summary of our recent research efforts to understand fluid flows, by using computational tools, will be presented. Our work towards understanding the mechanism of swing and reverse-swing of a cricket ball will be discussed. Questions such as, 'Can a new ball reverse-swing?' will be addressed. We employ modern stabilized finite element methods for solving the governing equations for fluid flows. They are utilized to compute flows at various Reynolds and Mach numbers including those that involve moving boundaries.

Some of the flow problems arise from practical applications while others add to understanding of certain fundamental issues in fluid mechanics. Most of the applications require large scale computing. To that extent, where-ever possible, in-house codes have been parallelized using MPI libraries. Scalability on parallel computers is demonstrated. Parallel implementations on the Linux cluster have resulted in super-linear speed-up. One of the several problems studied is the flow in an air-intake of a high speed engine. A mixed compression intake for a Mach=3 flow is considered. Viscous effects as well as boundary layer bleed are modeled. The buzz instability is observed in certain cases. Both, little and big buzz are found. Their frequency is related to the super-harmonics of the intake duct which acts as an open-closed organ pipe. The role of bleed in controlling the buzz oscillations is studied. A brief overview of our work on understanding wakes of bluff bodies will be presented.

Brief Bio-sketch

Sanjay Mittal is a Professor in the Department of Aerospace Engineering at IIT Kanpur. His research interests include unsteady aerodynamics, laminar separation bubbles on airfoils, aerodynamic shape optimization, fluid-structure interactions, bluff body flows, linear stability analysis, buzz instability in air intakes, train aerodynamics, aerodynamics of sports balls, traffic modeling and high performance computing.

Abstract

This presentation illustrates use of recent advances in parallel computing for the solution of problems from Ground Transportation, Energy, Aerospace and Marine sectors. Validated numerical simulations provide a cost-effective way of innovating design, reducing time to market, and preventing warranty issues. An overview of the goals for performing these simulations, approach used, outputs produced are presented.

Brief Bio-sketch

Manikandan Prithiviraj holds a BE Mechanical Engineering from BITS Pilani, MS (Research on Atomizing Sprays) and PhD (Research on flow and heat transfer in Shell-and-Tube Heat Exchangers) in Mechanical Engineering from Texas A&M University. He has been with CD-adapco, A Siemens Business for the last 18 years working in differing roles in Engineering, Services, Support and Training. He has worked extensively on Vehicle / Powertrain simulations. He currently heads the customer support team in India.

Abstract

The presentation will start with a brief discussion of the issues and challenges of multiphase flow with an emphasis on the dynamic evolution of the interface. Thereafter different examples will be taken to illustrate the role of experimentation, the need of unique sensors and the possibilities of computational modeling to build up an understanding of the complex multiphase flows. Examples will be drawn from rewetting, bubble dynamics and electrowetting.

Brief Bio-sketch

Dr. P. K. Das is presently the Dean of Post Graduate studies and Research and a professor in the Department of Mechanical Engineering, Indian Institute of Technology Kharagpur. His research interest covers a diverse field of thermo-fluids science and engineering with a focus in multiphase flow. The research activities in multiphase flow ranges from experimental investigations for unique interfacial phenomena, development of sensors and measurement systems for the local and average characterization of such flows and the development of CMFD (Computational Multi- Fluid Dynamics) tools for modeling. Some of the recent problems taken up by his research group are Leidenfrost phenomenon and rewetting, development of measurement systems based on optical and impedance techniques, hydrodynamics of bursting and coalescing bubbles, ferro-fluid dynamics, elrctrowetting, line tension influenced nucleation etc.

Abstract

We will briefly outline the challenges presented in the NASA CFD Vision 2030 document. Then we will present a summary of the research done in JNCASR and SankhyaSutra Labs and will describe how this will be used to tackle some of the challenges well before the year 2030.

Brief Bio-sketch

Sunil Sherlekar is the Chairman and CEO of SankhyaSutra Labs Pvt Ltd, a company incubated in Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bangalore. The company is focused on scientific computing with an initial emphasis on Computational Fluid Dynamics. He is also proposer of and a member of the Technology Mission for Indian Railways announced in the Railway Budget in 2015. Dr Sherlekar has a B. Tech. (Elect. Engg.) a M. Tech. (Computer Science & Engg.) and a Ph D. all from IIT Bombay. He has published several papers in the areas of Electronic Design Automation and VLSI Signal Processing, High-Performance Scientific Computing and a book on VLSI Signal Processing. He was an Associate Editor of IEEE Trans on VLSI, on the Steering Committees of ASPDAC and International Conf on VLSI Design and on the Executive Committee of India Semiconductor Association.