Investigation of Mixing

monkeyresultMécanique

22 févr. 2014 (il y a 3 années et 5 mois)

186 vue(s)

















Experimental and Numerical
Investigation of Mixing
Enhancement in Free
Turbulent Flows


Presentation by


Subba Rao V. Mandava





Supervisors


Prof. Francesc Giralt


Prof. Joan Herrero


Mixing



Mixing is important in many practical
engineering situations



Dispersion of contaminents of combustion



Flows tend to be complex



Turbulence models used to predict them
break down



3
-
D turbulence structures and their related
transfer processes in a plane turbulent wake



Entrainment and transfer of momentum, heat
and mass occur in free flows depend on
structure of the internal vertical motions



Interact with external irrotational flow field

..related to wake flows

Wake

Fluid
Mechanics
by
Frank M.
White,
Fourth
Edition,
Page no. 429
Entrainment

The
structure
of
turbulent
shear
flow
by A.A.
Townsend,
Page no. 240

Experiments


Expensive



Time taking



Risky



Computational fluid
dynamics (CFD)


Discretize the domain




Discretize the equiations




Solve discretized equations

Discretize the domain

D.
Xu,
Comput.
Methods
Appl.
Mech.
Engg. 193, 727, 2004
Discretize the domain

Mustafa
Tutar, J.
Fluids
Engg. 122, 694, 2000
Discretize the domain

Wolgang
Rodi,
Int. J.
Heat
and
Fluid
Flow 25, 537, 2004
Discretize the domain

M.
Breuer,
Int. J.
Numer.
Meth.
Fluids 28, 1281, 1998
Discretize the domain

Parviz
Moin, J. Comp.
Physics, 151, 757, 1999
Discretize the domain

K. Mahesh, J. Comp. Physics 197, 215, 2004
Computational fluid
dynamics (CFD)


Discretize the domain




Discretize the equations




Solve discretized equations

Discretize the equations

Non-linear
equations
Discretization techniques

Numerical methods


Finite
difference
Finite
volume
Finite
element,
or
Spectral
methods
}

B
-
spline results

Arthur G.
Kravchenko,
Phys.
Fluids 12, 403, 2000
Finite cylinders


Finite cylinders


Finite cylinders



Thank you !!