1. Title: Measurement capabilities at NWTF-part I

by Mr. Brajesh Chandra, Research Engineer, NWTF

2. Title: Synchronization in Forced Vibrations-a CFD study

by Mr. Nishit Yadav, PhD student, Aerospace Engg.

Date and Day: Oct 19, 2012; Friday

3. Title: Wind Tunnel Calibration.

by Mr. Brajesh Chandra, Research Engineer, NWTF

4. Title: Stability of Plane Couette Flow

by Mr. Ravi Kumar, MTech student, Aerospace Engg.

Date and Day: Nov 2, 2012; Friday

5. Title: NWTF Calibration: Test Plan.

by Mr. Brajesh Chandra, NWTF

Date and Day: Nov 23, 2012; Friday

6. Title: NWTF Systems and Their Maintenance.

by Dr. Chaturi Singh, NWTF

Date and Day: Nov 30, 4PM

Abstract

The presentation will describe the critical components of the NWTF and their maintenance schedule. We will also discuss the problems faced, and their possible solutions.

7. Title: An effort towards building "scaled model" to capture flight data for aerodynamic characterization.

by Prof. AK Ghosh, Aerospace Engineering

Date and Day: Jan 18, 2013

Abstract

We are currently working on design and manufacturing of instrumented flying platform to acquire flight data. These flight data will be processed to capture the aerodynamics associated with such models. These platforms are being equipped with sensors to acquire angle of attack, side slip angles,speed,Euler angles and linear and angular accelerations. We have been fairly successful in building platforms of various sizes(15cm to 400cm).We could instrument one of the models fairly accurately. In continue to this main exercise, an attempt was made to design and fabricate a scaled model of possible AURA(vertical tail less) configuration. We could design and fabricate this model and test flown it recently. It is an interesting exercise which demands equal participation from students,technicians and research scholars.

8. Title: Experimental sensitivity analysis of 2D bluff bodies.

by Professor Olivier Cadot, ENSTA-ParisTech

Date and Day: Friday, March 8,

We place small objects (steady disturbances) around a cylindrical bluff-body in a uniform flow at Re=10000-100000 to detect regions in which the disturbance shifts the most the global quantities compared to those of the undisturbed flow. The global quantities are such that the dominant frequencies, drag, base pressure, re-circulating bubble length...Comprehension of the sensitivity origin is approached by means of flow field measurements for the most critical regions. Finally, results are compared to a recent prediction elaborated in the framework of the stability theory applied to turbulent flows.

9. Title: About drag and flow of real road vehicles.

by Professor Olivier Cadot, ENSTA-ParisTech

Abstract:

After a brief presentation of the general problems encountered by the car builders, we will focus on two vehicles: Peugeot 3008 (monospace)and the Renault Traffic (van). Experiment are performed at real scale in the industrial wind tunnel S2A at Paris. We will present results about the road effect, static pressure measurements around the models, development of boundary layers, mean and fluctuating wake properties.

10. Title: Passive wake control of axisymetric bodies.

By Professor Olivier Cadot, ENSTA-ParisTech

Date: Friday, March 12

For these flow configurations, the azimuthal phase that locates the shedding activity from the body is random. We first characterize experimentally this shedding topology for 3D bodies (one having two planes a relational symmetry, a disk and a sphere) and then study how the azimuthal phase of the shedding can be fixed by adding a small steady disturbance either in the wake or on the body. Consequences on global properties are investigated.

11. Title : About drag and flow of real road vehicles.

By Professor Olivier Cadot, ENSTA-ParisTech

Date: Friday, April 5

After a brief presentation of the general problems encountered by the car builders, we will focus on two vehicles: Peugeot 3008 (monospace) and the Renault Traffic (van).Experiment are performed at real scale in the industrial wind tunnel S2A at Paris. We will present results about the road effect, static pressure measurements around the models, development of boundary layers, mean and fluctuating wake properties.

12. Title: Aerodynamics of a simplified road vehicle model.

By Professor Olivier Cadot, ENSTA-ParisTech

Date: Friday, April 12

Abstract: By changing the height to width ratio and the underbody gap to the road, we are able to investigate academically, geometries ranging from monospace cars to buses. Very often, the wake is bitable in either the left to right or top to bottom directions. Control strategies are proposed to eliminate this effect that is a source of additional drag. Complementary experiments are performed for a special configuration presenting the bitable behavior (Ahmed body with blunt trailing edge) at different scales such that the explored Reynolds numbers vary from 100 to 10^7.

13. Title: NWTF Instrumentation – Load Cells

Abstract: The National Wind Tunnel Facility (NWTF) at IIT Kanpur is a closed circuit, subsonic, atmospheric, and versatile, wind tunnel, where we carry out model studies for different Aeronautical and Non-aeronautical applications. The various physical quantities (base and derived) namely – pressure, force, moment, temperature, etc, are measured using a wide range of instrumentation. Though, NWTF is equipped with various state-of-the-art equipments and measurement systems, but, with increasing demand from the users, some additional industrial instrumentation needs to be procured.

14 Title: Unsteady wall pressure measurements in the NWTF: cylinder flow during drag crisis transitions.

by Professor Olivier Cadot, ENSTA-ParisTech

Date: Thursday, April 25

Abstract:120 pressure ports distributed on the cylinder are simultaneously recorded. The sampling frequency of 500Hz allows the temporal resolution of the shedding frequency. The range of Reynolds number 105< Re<4.105 is explored with the facility. The dynamics of the boundary layer reattachments on the cylinder shows a series of discrete and intermittent transitions. They are analyzed statistically in a section of the cylinder and then on its span wise length.