11 1 CFDVAL Langley Research Center Workshop CFD Validation of Synthetic Jets and Turbulent Separation Control Woodlands Hotel and Conference Center Colonial.
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CFDVAL
Langley Research Center WorkshopCFD Validation of Synthetic Jets and Turbulent Separation Control
Woodlands Hotel and Conference CenterColonial Williamsburg, Williamsburg, Virginia, USA
March 29-31, 2004
George Huang, Raymond LeBeau,Hua Chen, Liang Huang,
Vamsidhar Katam, Vimal Parimi and Yih-Nen JengDepartment of Mechanical Engineering
University of KentuckyLexington, KY
2 2 2
CFD Codes• GHOST
– In-house 2D structured multi-block overlapping code
– QUICK scheme for mean flow equations TVD for turbulence equations
– 2nd order backward time stepping
– Incompressible flow solver using SIMPLE approach
– SST turbulence model– MPI parallelization– Well validated for a wide
range of flow conditions.
3 3 3
Computer Codes• UNCLE
– In-house 2-D and 3-D unstructured code
– 2nd order upwind scheme– 2nd order backward time
stepping– Incompressible flow solver
using SIMPLE approach– Domain decomposition using
METIS– SST turbulence model– MPI parallelization– Only validated for a limit
number of cases.
4 4 4
Case 1
• Re =2458
• T = 53.11872
• T = 0.018444 (2880 steps per cycle)
• Average is taken after 5 cycles
• Ensemble averaging - Coarse grid 3 cycle and fine grid 1 cycle
5 5 5
Actuator MotionCase1
Phase(deg)
Disp(m
m)
0 100 200 300-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
Phase(deg)
U/Uref
0 100 200 300-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
0.04
9 9 9
phase, deg
v,m/s
0 100 200 300
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
HotwireCoarse GridDense Grid
X=0 mm, Y=0.1mm
15 15 15
Possible Causes• Diaphragm movement vs. piston motion
• 2D vs. 3D– Mass conservation– 3D effects
• Modeling approach
• Inlet velocity shift
• Chamber vs. outflow
16 16 16
Frequency (degree)
Power
0 100 200 300 400101
102
103
104
105
Frequency (degree)
Power
0 100 200 300 40010-1
100
101
102
103
Phase(deg)
Disp(mm)
0 100 200 300-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
Power Spectrum of the ActuatorCase 1
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