United States, May 14, 2014
International Short Course
New Theory on Turbulence Generation and Sustenance in
Boundary Layers
http://www.uta.edu/math/cnsm/tgs2014/
Free Registration until April 1, 2014
University of Texas at Arlington
May 14-16, 2014
Principal Lecturer:
Chaoqun Liu, Professor & Director, Center of Numerical
Simulation and Modeling, Department of Mathematics,
University of Texas at Arlington, Arlington, Texas, USA
cliu@uta.edu
Description:
International Short Course
New Theory on Turbulence Generation and Sustenance in
Boundary Layers
http://www.uta.edu/math/cnsm/tgs2014/
Free Registration until April 1, 2014
University of Texas at Arlington
May 14-16, 2014
Principal Lecturer:
Chaoqun Liu, Professor & Director, Center of Numerical
Simulation and Modeling, Department of Mathematics,
University of Texas at Arlington, Arlington, Texas, USA
cliu@uta.edu
Table Contents
1. Governing equation and DNS code
2. Orr-Sommerfeld equation and its solution
3. Vortex structure visualization by lambda 2 and
vortex filaments
4. Spanwise vortex formation by transfer from shear to
rotation
5. Shear layer stability analysis (Shear layer
instability is the mother of turbulence)
6. Lambda vortex root formation (Lambda vortex is not a
vortex tube, but rotation cores) by the spanwise vortex and
3-D T-S wave which is extremely unstable
7. Ring like vortex formation which is not part of
Lambda vortex (There is no such a process that the Lambda
vortex self-deforms to hairpin vortex; lambda roots and
vortex rings are developed separately by different
mechanisms)
8. Role of unstable modes (push up vorticity from the
wall, stimulate the transition from shear to rotation, but
cannot form vortex by themselves)
9. Mechanism of multiple vortex ring formation (There
is not vortex breakdown and reconnection) - all are formed
by shear layer instability which is generated by momentum
deficit caused by vortex ring ejection
10. U-shaped vortex (Not secondary but tertiary)
11. Large vortex structure (Very stable structure and
cannot break down)
12. Sweeps, ejections, positive and negative spikes, and
high shear layers in turbulent flow
13. Small length scale generation (Not by vortex
breakdown, but all are generated by shear layer instability
which is formed by positive and negative spikes no matter
how to define "vortex")
14. Energy transfer paths from larger vortex to smaller
vortex (Not by vortex breakdown but by vortex ring sweeps)
15. Flow Chaos (Not only by background noises but mainly
by instability of multiple vortex package structure)
16. Richardson eddy cascade revisit (There is no such a
cascade)
17. Kolmogorov hypothesis revisit (There is no vortex
breakdown and there is no energy passing through vortex
breakdown. There is no proof of existence of Kolmogorov
small scale)
18. Flow transition and turbulent flow control (Control
the shear layers)
19. Intermittence revisit (There is no intermittence in
turbulence)
20. Turbulence model revisit (Model the vortex packages
and relative motion between packages)
Contact Caixia Chen at caixiac@uta.edu if you are
interested.
