Download - Cylindrical Cyclon Separator-6
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Cylindrical Cyclone Separator Tanaka Lab.
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Analysis Condition Cf.article
(Akiyama) Analysis Condition
Analysis Program FrontFlow/blue Fluent 15.0 Xflow2014
Time Unsteady Steady/ Unsteady Unsteady
Analysis Model LES
SST k-, LES Standard k- Standard k-
WMLES
Element Number 17,000,000
820,000/ 7,900,000 4,000,000
Element Structure Hexa
Tetra, Hexa Octant tree
Inlet 9.47 [m/s] Re = 4.38104
Outlet 0 [Pa]
Tanaka Kazuhiro Lab 2
Z=0
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Tangential Velocity
0.0
1.0
2.0
-0.5 0.0 0.5
u / U
IN
x/D
z/D=-2.43 z/D=-3.57 2.0
0.0
1.0
-0.5
u / U
IN
0.0 0.5
x/D
Exp LES Akiyama SST k- k- k- XFLOW LES(FLUENT)
Comparisons of computed and measured tangential velocity in Z/D=-2.43, -3.57
An analysis result of XFLOW is the closest to experimental value in each model.
SST k-, k-, k- model computed steady-state analysis.
LES (FLUENT) approximately 50% are overestimated in comparison with experimental value.
Tanaka Kazuhiro Lab 3
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Axial Velocity
-0.5 w
/ U
IN
0.0
0.5
1.0
-0.5 0.0 0.5
x/D
z/D=-3.57
w /
UIN
-0.5
0.0
0.5
1.0
-0.5 0.0 0.5
x/D
z/D=-2.43
In five models, a tendency of XFLOW make advances in comparison with an experimental data in z/d=-2.43 , z/d=-3.57.
Exp LES Akiyama SST k- k- k- XFLOW LES(FLUENT)
Comparisons of computed and measured axial velocity in Z/D=-2.43, -3.57
Tanaka Kazuhiro Lab 4
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Comparison of Tangential Velocity (Steady) u /UIN
0 2.5 x
y
x y
z
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
Flow
A tendency seems similar and can catch a whirlpool core clearly qualitatively.
Cf.article x
y
x
z u /UIN
0 2.5
z/D = -2.43
z/D = -3.57
z/D = -0.335
Computed
LES(FLUENT)
Tanaka Kazuhiro Lab 5
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Comparison of Axial Velocity (Steady)
Flow
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
w/UIN
-0.5 1.5 x
y
x
y
x
z
z/D = -2.43
z/D = -3.57
z/D = -0.335
w/UIN
-0.5 1.5
x y
z
A tendency comes closer qualitatively.
Cf.article
LES(FLUENT)
Computed
Tanaka Kazuhiro Lab 6
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Comparison of Tangential Velocity (Steady) u /UIN
0 2.5 x
y
x y
z
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
Flow
x
y
x
z u /UIN
0 2.5
z/D = -2.43
z/D = -3.57
z/D = -0.335
The circumferential high-speed flow around the central axis of the spiral whirl core could not be confirmed.
Cf.article Computed
SST k-
Tanaka Kazuhiro Lab 7
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Comparison of Axial Velocity (Steady)
Flow
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
w/UIN
-0.5 1.5 x
y
x y
z
x
y
x
z
-0.5 1.5
w/UIN
z/D = -2.43
z/D = -3.57
z/D = -0.335
The flow suddenly damps below at z/D=-2.43, and the high-speed upswing around the central axis could not be confirmed.
Cf.article Computed
SST k-
Tanaka Kazuhiro Lab 8
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Comparison of Tangential Velocity (Steady) u /UIN
0 2.5 x
y
x y
z
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
Flow
x
y
x
z u /UIN
0 2.5
The high-speed circumferential flow around the central axis of the spiral whirlpool could not be confirmed.
z/D = -2.43
z/D = -3.57
z/D = -0.335
Standard k-
Computed Cf.article
Tanaka Kazuhiro Lab 9
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Comparison of Axial Velocity (Steady)
Flow
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
w/UIN
-0.5 1.5 x
y
x y
z
x
y
x
z
-0.5 1.5
w/UIN
The flow suddenly damps below at z/D=-2.43, and the high-speed upswing around the central axis could not be confirmed.
z/D = -2.43
z/D = -3.57
z/D = -0.335
Standard k-
Computed Cf.article
Tanaka Kazuhiro Lab 10
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Comparison of Tangential Velocity (Steady) u /UIN
0 2.5 x
y
x y
z
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
Flow
x
y
x
z u /UIN
0 2.5
I cannot confirm the high-speed turning speed of the central axis circumference of the spiral whirlpool.
z/D = -2.43
z/D = -3.57
z/D = -0.335
Standard k-
Computed Cf.article
Tanaka Kazuhiro Lab 11
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Comparison of Axial Velocity (Steady)
Flow
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
w/UIN
-0.5 1.5 x
y
x y
z
x
y
x
z
-0.5 1.5
w/UIN
The flow suddenly damps below at z/D=-2.43, and the high-speed upswing around the central axis could not be confirmed.
z/D = -2.43
z/D = -3.57
z/D = -0.335
Standard k-
Computed Cf.article
Tanaka Kazuhiro Lab 12
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Comparison of Tangential Velocity at t=3.0[s]
The influence through difference of the calculation lattice can be seen, but the circumferential velocity distributions comes closer qualitatively.
LES(XFLOW)
x
y
x y
z
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
Flow
Cf.article u /UIN 0 2.5 x
y
x
z
Computed
z/D = -2.43
z/D = -3.57
z/D = -0.335
0 2.5
u/UIN
Tanaka Kazuhiro Lab 13
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Comparison of Axial Velocity at t=3.0[s]
The flow comes closer qualitatively. Because the width of contour cannot be controlled, the comparison is difficult.
x y
z
LES(XFLOW)
Flow
z/D = -2.43
Vortex Table
z/D = -3.57
z/D = -0.335
w/UIN
-0.5 1.5 x
y
x y
z
x
y
x
z
z/D = -2.43
z/D = -3.57
z/D = -0.335
Computed Cf.article -0.5 1.5
w/UIN
Tanaka Kazuhiro Lab 14
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Comparison between XFLOW and FLUENT
x
y
x
z
u /UIN
0 2.5
z/D = -2.43
z/D = -3.57
z/D = -0.335
7,900,000element
0 2.5
u/UIN
XFLOW FLUENT 3,900,000 element
Because line-formed distributions are seen in XFLOW, so XFLOW realizes higher precision than FLUENT.
Tanaka Kazuhiro Lab 15
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Conclusion
Using each model of the numerical analysis, the comparison between the experimental values, used for the article of Akiyama and the calculated values through XFLOW and FLUENT.
The vortex core of the spiral whirlpool could not arrive at to a vortex table in SST k-, Standard k-, Standard k- model, even the phenomena could be seen in the experiment of Akiyama.
In all calculation models, XFLOW gives the closest results with the experimental value quantitatively.
Tanaka Kazuhiro Lab 16
conclusions
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Stairmand Cyclone Separator Tanaka Lab.
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Cf. Article
Derksen, J.J., Separation Performance Predictions of a Stairmand High-Efficiency Cyclone, AIChE Journal, Vol. 49, No. 6 (2003), pp. 1359-1371.
0.2D
0.36D 0.51D
0.62D
D = 0.29 [m]
0.14D 1.5D
D 0.5D 0.84D 0.52D
2.5D 2D 4D 1.5D
0.37D D D 0.5D
Inlet Outlet
Swirl Stop
Feed Chamber Vortex Finder Dust Collection Box x
z y
x
z y
Tanaka Kazuhiro Lab 18
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Analysis Condition
3.25D
Measurement Location
x
z
y
Cf. article (Derksen) Analysis Condition
Analysis Program - Fluent 15.0 Xflow2014
Time Unsteady Steady/ Unsteady Unsteady
Analysis Model LES
SST k-, LES Standard k- Standard k-
WMLES
Element Number 7,700,000
380,000/ 8,800,000
100,000/ 9,300,000
Element Structure Hexa Hexa Octant tree
Inlet 16.1 [m/s] Re 2.8105
Outlet
= 0 0 [Pa] Tanaka Kazuhiro Lab 19
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Tangential Velocity and Axial Velocity
-2
-1
0
1
2
-1 0 1
Location x/R
Velo
city
u/U
in
-0.5
0
0.5
1
-1 0 1
Location x/R Ve
loci
ty u
z/Uin
Steady Viscosity model 3,800,000element(FLUENT)
LES Darksen Exp Hoekstra
SST k-
Realizable k-e
RNG k-e
RSM
Standard k-
LES Darksen Exp Hoekstra
SST k-
Realizable k-e
RNG k-e
RSM
Standard k-
-2
-1
0
1
2
-1 0 1-0.5
0
0.5
1
-1 0 1
Tanaka Kazuhiro Lab 20
The evaluation of tangential velocity near the wall is not appropriate. The distribution of axial velocity is much different at the center of pipe, compared with experimental result.
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Tangential Velocity and Axial Velocity Unsteadyt = 0.735 [s] LES 8,800,000 element(FLUENT)
Location x/R
Velo
city
u/U
in
Location x/R
Velo
city
uz/U
in
-2
-1
0
1
2
-1 0 1
LES Darksen Exp Darksen
LES(FLUENT)
LES Darksen Exp Darksen
LES(FLUENT) XFLOW XFLOW
-0.5
0
0.5
1
-1 0 1
100,000 element(XFLOW)
Tanaka Kazuhiro Lab 21
The gap of the peak values is caused by unsteady flow analysis. The results of XFLOW are instantaneous values.
The difference of axial velocity is caused by strong unsteadiness of the vortex core of the spiral whirlpool.
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Tangential Velocity and Axial Velocity Average(Time) (1[s]~3[s]) WMLES 9,300,000element(XFLOW)
LES Darksen Exp Darksen
LES Darksen Exp Darksen
0 -2
0.5 -0.5
2
0
x/D
/
Xflow Xflow
0 -0.5
0.5 -0.5
1
0
x/D
w/
0.75D
Measurement location
Tanaka Kazuhiro Lab 22
Both of tangential velocity and axial velocity correspond to experimental result qualitatively. The peak value of tangential velocity is 25% bigger than the experimental result in our evaluation. The peak value of axial velocity is 10% bigger than the experimental result in our evaluation.
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The time required in the XFLOW analysis
Analysis Element number time Simulation
time CPU(core) Analysis
Stairmand cyclone 9,300,000 Unsteady 3.0[s] 40(20) 180[h]
Stairmand cyclone 100,000 Unsteady 10.0[s] 8 6[h]
Akiyama cyclone 3,920,000 Unsteady 3[s] 16 140[h]
Stairmand cyclone 8,800,000 Unsteady 5[s] 20 168[h]
Stairmand cyclone 3,800,000 Unsteady 5[s] 20 72[h]
Akiyama cyclone 7,900,000 Unsteady 3[s] 20 168[h]
Unsteady analysis only
Tanaka Kazuhiro Lab 23
XFLO
W
FLUEN
T
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Conclusion
Tanaka Kazuhiro Lab 24
The analysis through LES of XFLOW realizes unsteady motion of inside flow correctly.
The results of XFLOW LES shows that the velocity near the wall is different from the experimental results because of influence of boundary condition and calculation lattice.
Even though LES XFLOW result with 9,300,000 element still has a little gap compared with the experiments, but the LES result and peak values agree with the experiments qualitatively.
Conclusions
Cylindrical Cyclone SeparatorAnalysis ConditionTangential VelocityAxial VelocityComparison of Tangential Velocity (Steady)Comparison of Axial Velocity (Steady)Comparison of Tangential Velocity (Steady)Comparison of Axial Velocity (Steady)Comparison of Tangential Velocity (Steady)Comparison of Axial Velocity (Steady)Comparison of Tangential Velocity (Steady)Comparison of Axial Velocity (Steady)Comparison of Tangential Velocity at t=3.0[s]Comparison of Axial Velocity at t=3.0[s]Comparison between XFLOW and FLUENTConclusionStairmand Cyclone SeparatorCf. ArticleAnalysis ConditionTangential Velocity and Axial VelocityTangential Velocity and Axial VelocityTangential Velocity and Axial VelocityThe time required in the XFLOW analysisConclusion