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Page 3. www.RDT.ir. FLUENT [email protected] kazem.esmaili@gmail. com ... Page 6 ... [2] FLUENT Inc. Fluent User s Guide(2005). [3] Gonzalez, A. and  ...
FLUENT

[email protected]

[email protected] , [email protected] , [email protected]

FLUENT

Gambit

FLUENT VOF

FLUENT VOF

www.RDT.ir

RNG

RNG

. . . Rajaratnam

.

Wu Liu [ ]

Chippada [ ] Zhao [ ]

Poisson

Gonzalez [ ] . Flow-3D

LES

k-

Bombardelli .

(

Liu )

[ ] FLUENT FLUENT (CFD)

C

[ ]

www.RDT.ir

:

FLUENT Spalart-Allmaras (Reynlods Stress Model ) RSM

(Large Eddy Simulation ) LES Realizable k-

(Renormalization group) RNG kk(Shear Stress Transport ) SST kk(Detached Eddy Simulation) DES

k:k-

[ ] [ ]

pui xi

P t

pui t p

p' xi

ui u j

xj

0

ui xj

t

xj

'

uj xi

xi

t

p'

p

t

ui

2 k 3 p

k k

Dk Dt

D Dt

k xi

t

xi

k

Gk

Gb

2 t

xi

C1

xi

k

(Gk

G3 Gb ) C 2

Gk

Gb k

t

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k

C

k2

t

k

1 .0

C

k

C3 k

C1

1.92 C1

xi

k

k

k xi

ff

Gk

1.44

13

RNG

Gb

2

D Dt

1.68

C2

u

k

Dk Dt

C2

tanh

0.09

ff

xi

C1

xi

k

(Gk

G3 Gb ) C 2

R

k

1.42

k

ff

C

R

RNG

[ ] (Volume Of Fluid) VOF [ ]

q

Hirt , Nichols

VOF

q q

1

q

0

q

0

q

q

1

q q

q q

t q

www.RDT.ir

0

ui q

q

xi

1

uj

q

xj

uk

q

xk

0

Donor

Euler Explicit

Implicit

FLUENT

VOF

Geometric Reconstruction

[ ]

Liu

y1

Expt. 1 2 3

Y1(mm) U1(m/s) 71 1.67 71 2.08 41 2.10

F1 2.0 2.5 3.32

Y2(mm) 171.6 216 165

GAMBIT

Quad-map

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Q(L/s) 54.9 68.6 40.0

R1 118,570 147,680 86,100

Acceptor

VOF PRESTO!

PISO

0.2

y(m)

0.15

0.1 0.05 0 0

0.5

1 x(m )

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1.5

2

0.16

0.12

0.12

y(m)

y(m)

0.16

0.08 0.04

0.08 0.04

0

0

0

0.3

0.6 u(m/s)

0.9

1.2

0

0.3

0.6

0.9

u(m/s)

x=0.5 m

x=1 m

x=2 m

0.16

y (m)

0.12

0.08

0.04

0 0

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0.02 0.04 0.06 0.08 Turbulence kinetic energy (m 2/s2)

0.1

1.2

1.5

FLUENT

(VOF)

RNG k-

FLUENT

[1] Chippada, S. Ramaswamy, B. and Wheeler, M.F., Numerical simulation of hydraulic jump , International Journal for Numerical Methods in Engineering, Vol. 37, No. 8, 1994, pp. 13811397. [2] FLUENT Inc. Fluent User s Guide(2005). [3] Gonzalez, A. and Bombardelli, F., Two-Phase-Flow theoretical and numerical models for hydraulic jumps, including air entrainment , Proceeding of the Congress- International Association for Hydraulic Research, Vol. 1, pp. 28-29, 2005. [4] Hirt, C.W. and Nichols, B.D., Volume of fluid (VOF) method for the dynamics of free boundaries , Journal of Computational Physics, Vol. 39, jan 1981, pp. 201 225. [5] Liu, M. Rajaratnam, N. and Zhu, D., Turbulence Structure of hydraulic jumps of low Froude number , Journal of Hydraulic Engineering, Vol. 130, No. 6, June 2004, pp. 512-520. [6] WILCOX, D.C., Turbulence Modelling for CFD , DCW Industries, California, USA, 1994. [7] Wu, S. and Rajaratnam, N., Transition from hydraulic jump to open channel flow , Journal of Hydraulic Engineering, Vol. 122, No. 9, September 1996, pp. 526-528. [8] Zhao, Q. Misra, S. Svendsen, I. and Kirby, J., Numerical study of a turbulent hydraulic jump , proc. 17th ASCE Engineering Mechanics Conference, University of Delaware, Newmark, 2004.

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