Vejapong Juttijudata
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Contact
Information Department of Aerospace
Engineering |
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Assistant Professor,
Department of Aerospace Engineering B.Eng. 1997 (Chula); M.Sc., D.I.C. 1998 ( |
Phone +66(0) 2942 8555 Ext. 1708 Email vejapong.j@ku.ac.th |
Biography
After earning a B.Eng. in Mechanical
Engineering from Chulalongkorn
University in 1997, he joined the Department of Aerospace Engineering at Kasetsart University as a
lecturer and was awarded a scholarship from the Royal Thai Government for his
graduate study. He received his M.Sc. in
Computational Fluid Dynamics and Structural Mechanics from the Department of Aeronautics,
Imperial College of Science, Technology and Medicine (now Imperial College London) in 1998 and his
Ph.D. in Aerospace Engineering from Sibley School of Mechanical and Aerospace Engineering, Cornell University in 2003. Under the
supervision of John Lumley,
his doctoral research focused on the development of proper orthogonal
decomposition (POD) in Squire's coordinate system and low-dimensional models
for turbulence channel. He returned to the Department of Aerospace Engineering
at
Current Research Interests
- Flow Control
- Physics and Modelling of Transition and Turbulence
- Applied Aerodynamics
- Computational Fluid Dynamics (CFD) and Turbulence Simulation
Current Research Projects
Flow Control for Turbulent Drag Reduction
Turbulent skin-friction drag accounts for approximately one third to one half
of the total drag on a commercial aircraft and as much as 90% of the total drag
on a submarine vehicle. Fuel consumption could be cut by one third to half or
aircraft lift-to-drag ratio could be increased by a factor of two by means of
clever flow control to reduce turbulent drag. The goal of this project is to
develop new flow control techniques both active and passive control that are
efficient and practical for real applications in the future. As a first step,
we are only interested in implementing these techniques in direct numerical
simulation (DNS). Current activities in this project include developing
reduced-order models and control schemes for model-based feedback control, and
studying the response of flows under different actuations.
Other participant: A. Hokpunna (KMUTT), faculty
member; V. Satthavisut (Department of Aerospace
Engineering), graduate student
Transition and Dynamics of Turbulent Spots
The location of the onset and extent of transition are
of major importance in turbomachinery design where
wall shear stress and heat transfer rate are of interest. Objective of this
project is to study the physics of transition process and the dynamics of
turbulent spots in the hope that this will shed some light on how to model and
predict transition. Current work is focusing on the complete transition process
on a compressor blade consisting of separation-induced transition on suction
side and bypass transition on pressure side of the blade, bypass transition on
a zero-pressure gradient boundary layer and the dynamics of isolated turbulent
spot and interaction of turbulent spots. Our main working horses in the
investigation are direct numerical simulation (DNS) as well as proper
orthogonal decomposition (POD).
Other participants:
Physics of Turbulent Boundary Layers
Many applications in engineering have to deal with
turbulent boundary layers. In order to manipulate them in our favour, we need to have a good understanding of turbulent
boundary layers. In this project, we are trying to identify the most energetic
coherent structures inside the boundary layers and understand their dynamics in
order to obtain the backbone of turbulence production mechanism of the boundary
layers. The dynamics of near-wall (autonomous) structures on smooth-wall
boundary layer, and the effect of roughness to turbulent boundary layers have
been studied extensively in the past. We are now digging in more on the effect
of roughness, and starting to look at inner/outer region interactions in
high-Reynolds number turbulent boundary layers. Our study is based on direct
numerical simulation (DNS) as well as proper orthogonal decomposition (POD)
Other participant: K. Bhaganagar (
Selected Publications
Journals
- K. Bhaganagar, and V. Juttijudata (2011), Turbulent time-events in channel with rough walls, Theoretical and Computational Fluid Dynamics. DOI: 10.1007/s00162-011-0242-x.
- M. Sen, K. Bhaganagar, and V. Juttijudata (2007), Application of proper orthogonal decomposition (POD) to investigate a turbulent boundary layer in a channel with rough walls, Journal of Turbulence. 8(41).
- V. Juttijudata, J.L Lumley, and D. Rempfer (2005), Proper orthogonal decomposition in Squire's coordinate system for dynamical models of channel turbulence, Journal of Fluid Mechanics. 534: 195-225.
- V. Juttijudata (2004), Direct Numerical Simulation (DNS), Journal of Research in Engineering and Technology. 1(4): 358-394.
- V. Juttijudata (2004), Low-Dimensional Models for Turbulent Flows, Journal of Research in Engineering and Technology. 1(4): 395-422.
Proceedings and Conferences
- V. Juttijudata.,
S. Sirisup (2011), A Study of Bypass Transition
in a Zero-Pressure Gradient Boundary Layer Subjected to Free-stream
Turbulence. The 2nd TSME International Conference on Mechanical Engineering
2011, (TSME-ICoME 2011),
- V. Juttijudata., S. Sirisup (2010), Coherent Structures of Transitional
Boundary Layers in a Linear Compressor Cascade. The 1st TSME International
Conference on Mechanical Engineering 2010, (TSME-ICoME
2010),
- V. Juttijudata
(2010), Kinematics and Dynamics of Coherent Structures within a Turbulent
Spot in Plane Channel Flow. The 14th International Annual National
Symposium on Computational Science and Engineering (ANSCSE 14),
- V. Juttijudata.,
P. Kongpunvijit, P. Sribonfha
and P. Luangpaiboon (2009), Wing Optimization in
a Context of Constrained Response Surface Methods. The 23rd Conference of
the Mechanical Engineering Network of
- M. Kaewbumrung
and V. Juttijudata (2008), Effects of Blocking
Plate on HSA Vibration and Air Flow inside 2.5" High Speed HDD using
Large-Eddy Simulation. The 7th ASEAN ANSYS Conference,
- M. Kaewbumrung
and V. Juttijudata (2008), Effects of Blocking
Plate Geometry on HSA Vibration and Air Flow inside 2.5" High Speed HDD
using RNG k-ε Model. The 12th Annual National Symposium on
Computational Science and Engineering (ANSCSE 12),
- M. Kaewbumrung
and V. Juttijudata (2007), Effects of the
Workbench Geometry on the Characteristics of Air Flow in a Clean Room. The
21st Conference of Mechanical Engineering Network of
- S. Wanchat,
K. Sengpanich and
V. Juttijudata (2007), The Numerical Study of
Swirling Effect to Aerodynamic Performance of Gas Turbine Burner Using
Standard k-ε Turbulence Model. The 21st Conference of Mechanical
Engineering Network of
- K. Sengpanich,
- S. Gururatana,
V. Juttijudata, E. Juntasaro,
and V. Juntasaro (2006), Prediction of 3D
turbulence-induced secondary flows in rotating square ducts. Whither
Turbulence Prediction and Control (WTPC),
- V. Juttijudata
(2006), The feasibility study of using the proper
orthogonal decomposition in Squire's coordinate system for drag reduction
control design. The 3rd Aerospace Engineering Conference of
- T. Charoenkijtavee,
V. Juttijudata, and P. Arundachawat
(2006), Performance analysis for submersible pump - A numerical approach.
The 10th Annual National Symposium on Computational Science and
Engineering (ANSCSE 10),
- V. Juttijudata
(2006), Turbulent drag reduction - A direct
numerical simulation approach. The 10th Annual National Symposium on
Computational Science and Engineering (ANSCSE 10),
- C.W. Rowley, and V. Juttijudata (2005), Model-based control and estimation of cavity flow oscillations. Proceedings of the 44th IEEE Conference on Decision and Control, December 2005.
- C.W. Rowley, V. Juttijudata, and D.R. Williams (2005), Cavity flow control simulations and experiments, AIAA paper 2005-0292, 43rd AIAA Aerospace Sciences Meeting, January 2005.
Teaching Activities
- Fluid Mechanics
- Aerodynamics
- Viscous Aerodynamics
- Turbulent Flows
- Gas Dynamics
- Computational Fluid Dynamics
- Numerical Methods
Last revised: 8 March 12