1. Computational Fluid Dynamics – Energy savings of migrating Canadian geese
CFD mesh generation around the
flapping wing
Full geometry (A) and airfoil (S1223) (B) Morphology of the flapping wing
Coordinate location (A and B), upstroke (C)
and downstroke (D) motions (dynamic mesh)
ANSYS Fluent: unsteady k-ε model
3D vortex dynamics
Vorticity fields explain the upwash and
downwash patterns and demonstrate the
aerodynamical benefits of the distinctive V
formation during the migration
Journal publication (cited by two Nature papers and ScienceNews):
http://www.sciencedirect.com/science/article/pii/S0022519312006212

2. Computational Fluid Dynamics – SCR system guide vane optimization
HK-DeNOx-SCR Optimization
Reduce the effect of the large vortex and
enhance the performance of SCR via optimizing
guide vane angles. Obtained angle distributions
are 𝜃𝜃1 = 37°, 𝜃𝜃2 = 23° and 𝜃𝜃3 = −10°
Evaluation of the optimized
position of the guide vane for
the uniform flow distribution
ANSYS Fluent
k-ε model turbulent model, structured grid,
uniform flow inlet and uniform pressure outlet
Inlet condition
• Flowrate: 55,670 Nm3/h
• Temperature: 324.75 °C
Outlet condition
• Pressure: +68 mmAq

3. Assessment of Film Cooling Effectiveness for the Flat Plate
Film cooling effectiveness η:
Taw: adiabatic wall temperature
Tc: coolant temperature
Tm: mainstream temperature
<Schematic Top view of the apparatus>
PC
Mainstream Air
Flow
Straightener
Float
Flow Meter
Flow
Control Valve
Coolant from
Compressor
Suction
Type
BlowerTest Surface
Air Plenum
IR
Camera
Pipe Heater
Saran wrap window
Coolant Inlet
Into Plenum
Plenum
95mm
60mm
15mm
θ = 30°
φ = 4mm, β = 0°
x/D
η
x/D=0
Black paint
painted area
x/D=16.4
calculated area
η
Effectiveness in different
blowing ratios (M)
The maximum effectiveness was
obtained when the blowing ratio
was 0.5 which corresponds to the
optimum blow ration range (M =
0.5 - 0.8)
m
c
mm
cc
V
V
V
V
M ≅=
ρ
ρ

4. Experimental Design – Very High Temperature Reactor (VHTR)
VHTR test facility
Manufactured by Moore fabrication (polycarbonate)
& Madewell (stainless steel), Houston, TX
VHTR reference reactor
Analyzed on accident conditions
(Loss-of-coolant accident)
Solidworks 3D CAD design (1/16th scale)
Focused on water tightness (no leakage), wire access
and flow visualization (Particle Image Velocimetry)
Scale down
(Re and Ri
similarity)
Design and
fabrication
Region of
interest

5. Experimental Facility – Very High Temperature Reactor (VHTR)
Core pipe assembly
Journal publication (scaling, assembly, preliminary test and results):
http://www.sciencedirect.com/science/article/pii/S014919701500092X
NI SCXI-1001 DAQ + LabVIEW
Monitored 54 temperatures (25 each
inlet/outlet, CJ inlet/outlet and system
inlet/outlet), differential pressure and
flowrate
Thermocouples
Heating tapes
Silicon
tubing
UV epoxy Ferrules
Thermocouple tip
Insulation
Outer containment
Wire access
Assembly
and test
setup

6. Flow Visualization – Particle Image Velocimetry (PIV)
PIV laser and camera system for flow visualization
PIV test result and further analysis
Post-
processing:
MATLAB
PIV codes
and tecplot
Run test:
Monitor
temperature,
pressure and
flowrate

7. Computational Fluid Dynamics – Commercial software validation
CFD validation: Star-CCM+ and ANSYS Fluent
Grid (mesh) generation Laminar velocity profile test (Re = 100) Turbulent k-ε model test
Full scale model validation test Conjugate heat transfer test
PIV Experiment vs CFD
Turbulent model test (k-ε vs Reynolds
stress turbulent (RSM) model). RSM is
superior for the complex geometry. Natural
convection with Boussinesq approximation
is tested for the buoyant jet analysis.