Vejapong
Juttijudata
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Contact Information Department of
Aerospace Engineering THAILAND |
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Associate
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
- Physics and Modelling of Transition and Turbulence
- Flow Control
- 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 in
Canonical and Complex Flows
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. Recently,
we started to look at the effect of rotation and the interaction of wind
turbine wakes & atmospheric 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
- W. Rojanaratanangkule., V.
Juttijudata (2014), Effect of Rotation on Coherent Structures in
Wall-Bounded Turbulence. Proceedings of the Ninteenth Australasian Fluid
Mechanics Conference,
- P. Sribonfha, S. Sirisup,
V. Juttijudata., (2013), Impact of Geometric Uncertainties on Pump
Performance. The 4th TSME International Conference on Mechanical
Engineering 2013, (TSME-ICoME 2013),
- 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: 9 January 2016