Vinh-Tan Nguyen

Vinh-Tan Nguyen
Institute Of High Performance Computing · Fluid Dynamics

PhD

About

49
Publications
8,058
Reads
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432
Citations
Introduction
I am a Scientist at the Institute of High Performance Computing, A*STAR. I lead a group of researchers working on coupled fluid dynamics including fluid-structure interactions. My research focuses on development of advanced high performance computing platform for modelling and simulations of multiphysic coupled problems in a wide range of engineering applications such as aerospace, marine-offshore, biological flows, printing technologies, CFD based quantitative risk analysis.
Additional affiliations
May 2007 - March 2016
Institute Of High Performance Computing
Position
  • Senior Scientist, Group Manager
May 2007 - March 2016
Institute Of High Performance Computing, A*STAR
Position
  • Senior Scientist, Group Manager
February 2005 - September 2006
Singapore-MIT Alliance
Position
  • PhD Student
Education
June 2002 - January 2007
Singapore-MIT Alliance
Field of study
  • Computational Engineering; Aerospace Engineering; Fluid Dynamics

Publications

Publications (49)
Conference Paper
View Video Presentation: https://doi.org/10.2514/6.2022-0712.vid This study investigates skin-friction drag reduction of a turbulent boundary layer over shallow dimples. The motivation of the present study is to explore the influence of shallow dimples on skin friction and the turbulent boundary layer profile. The behavior of flow structures downst...
Article
Full-text available
Numerical simulation is a widely used tool for Coriolis flowmeter (CFM) operation analysis. However, there is a lack of experimentally validated methodologies for the CFM simulation. Moreover, there is no consensus on suitable turbulence models and configuration simplifications. The present study intends to address these questions in a framework of...
Article
Full-text available
The ink drop generation process in piezoelectric droplet-on-demand devices is a complex multiphysics process. A fully resolved simulation of such a system involves a coupled fluid–structure interaction approach employing both computational fluid dynamics (CFD) and computational structural mechanics (CSM) models; thus, it is computationally expensiv...
Preprint
Full-text available
An oscillating spanwise pressure gradient is imposed numerically to control the flow separation and reduce the drag of a turbulent flow in a channel with square bars. The transverse flow produces a maximum drag reduction of 25\%, due to lower pressure and skin-friction drag forces. The pressure drag reduction reaches a maximum of 22\% and is due to...
Preprint
Full-text available
Simulations of turbulent fluid flow around long cylindrical structures are computationally expensive because of the vast range of length scales, requiring simplifications such as dimensional reduction. Current dimensionality reduction techniques such as strip-theory and depth-averaged methods do not take into account the natural flow dissipation me...
Article
Full-text available
Simulations of turbulent fluid flow around long cylindrical structures are computationally expensive because of the vast range of length scales, requiring simplifications such as dimensional reduction. Current dimensionality reduction techniques such as strip-theory and depth-averaged methods do not take into account the natural flow dissipation me...
Conference Paper
A machine-learning based closure is explored for the prediction of the turbulent wake of flow past a circular cylinder at a high Reynolds number. We show that classic turbulence closures based on the turbulent-viscosity hypothesis are not capable of modelling the non-linear relationship between the mean quantities and the target turbulent fields. I...
Preprint
Full-text available
Turbulent flow evolution and energy cascades are significantly different in two-dimensional (2D) and three-dimensional (3D) flows. Studies have investigated these differences in obstacle-free turbulent flows, but solid boundaries have an important impact on the cross-over between 3D to 2D turbulence dynamics. In this work, we investigate the span e...
Article
Turbulent flow evolution and energy cascades are significantly different in two-dimensional (2-D) and three-dimensional (3-D) flows. Studies have investigated these differences in obstacle-free turbulent flows, but solid boundaries have an important impact on the cross-over from 3-D to 2-D turbulence dynamics. In this work, we investigate the span...
Article
Full-text available
Occupational thermal comfort is one of the key performance indicators for green and sustainable buildings. Within air-conditioned indoor spaces, the deployment of air supplies play an importance role in determining thermal comfort conditions. This becomes more critical when the non-uniformity of heat loads in space increases. The objective in this...
Article
Full-text available
Piezoelectric structures are widely used in engineering designs including sensors, actuators, and energy-harvesting devices. In this paper, we present the development of a three-dimensional finite element model for simulations of piezoelectric actuators and quantification of their responses under uncertain parameter inputs. The implementation of th...
Conference Paper
Full-text available
Energy saving devices (ESD) such as propeller ducts, pre-swirl stators, pre-nozzles, etc have been explored as a more economic and reliable approach to reduce energy consumption for both in-operation and newly design ships over the past decades. Those energy saving devices work in the principle of reducing ship resistance and improving propulsion e...
Article
Wake-induced vibrations are considered distinctively different from well-known vortex induced vibrations where bluff body structures vibrate under vortex shedding in the wake of flows passing through them. Understanding characteristics of wake-induced vibrations plays an important role in design of marine-offshore structures such as platform column...
Chapter
Different types of artificial prosthetic heart valves have been implanted to replace defective heart valves since the 1960s. Mechanical heart valves, especially bileaflet mechanical heart valve (BMHV) designs, remain the most prevalently used due to their strength and durability. However, there is always a risk of blood clot formation after a mecha...
Article
In this paper, we develop numerical methods for modeling blast and fragments generated from explosive detonation and apply them to scenarios representing improvised explosive devices in confined spaces. The detonation of condensed phase explosives is modeled with a programmed burn method in a three-dimensional multimaterial flow solver. This solver...
Article
Forfloating offshore wind turbines, rotors are under coupled motions of rotating and platform-induced motions because of hydrodynamics impacts. Notably, the coupled motion of platform pitching and rotor rotating induces unsteadiness and nonlinear aerodynamics in turbine operations; thus having a strong effect on the rotor performances including thr...
Conference Paper
Wake induced vibration is a distinctive phenomena of fluid-elastic instability arising from interactions of a body in the wakes of another bluff body and characteristically different from the well-understood vortex induced vibrations. This work presents a fluid-structure interactions numerical model as an alternative tool for investigation of wake...
Conference Paper
Hybrid RANS-LES methods are gaining popularity for the simulation of the complex bluff body flows at high Reynolds numbers due to their reduced computational cost and good accuracy. A number of such methods have been proposed in the literature. Each of these methods have enjoyed varying degree of success for different applications. One of the most...
Article
This work presents a development of computational fluid dynamic model for numerical simulations of flow induced vibrations, important physical phenomena characterizing operations of various engineering structures, especially offshore installations including risers and platforms. We propose an application of detached eddy simulation (DES) approach f...
Article
Full-text available
In this paper, a method is proposed for modeling explosive-driven fragments as spherical particles with a point-particle approach. Lagrangian particles are coupled with a multimaterial Eulerian solver that uses a three-dimensional finite volume framework on unstructured grids. The Euler–Lagrange method provides a straightforward and inexpensive alt...
Article
This work presents a computational fluid dynamic (CFD) model to simulate blood flows through the human heart's left ventricles (LV), providing patient-specific time-dependent hemodynamic characteristics from reconstructed MRI scans of LV. These types of blood flow visualization can be of great asset to the medical field helping medical practitioner...
Article
We propose an unstructured mesh adaptation approach for unsteady high speed compressible Navier-Stokes applications involving blasts and explosions with the presence of strong shock waves propagating in three dimensional complex domains. The idea is to identify the locations of critical physics locally and then re-mesh these regions based on soluti...
Article
Fluid structure interactions (FSI) has played an important role in many engineering applications ranging from aeroelasticity in aerospace engineering, wind turbines, civil engineering, bioengineering, etc. This paper focuses on FSI simulations of high speed compressible flows and its applications in studying blast impacts on flexible structures. Un...
Article
BACKGROUND AND AIM OF THE STUDY: The trileaflet heart valve is a more desirable mechanical heart valve due to its similarity to native heart valves, which produce a central blood flow with decreased blood flow disturbance. There are, however, many challenges and difficulties in designing a trileaflet valve, mainly due to a greater number of moving...
Article
An efficient method for the simulation of compressible multimaterial flows with a general form of equation of state is presented for explosive detonation and airblast applications. Multimaterial flows are modeled with a volume-fraction type approach for immiscible fluids governed by the compressible Euler equations on three-dimensional unstructured...
Conference Paper
Full-text available
This study investigates the application of overset grids for simulating high Reynolds numb er flows in OpenFOAM. The problem of tandem cylinders is specifically chosen as an appropriate test model due to (a) a direct relevance to the marine industry and (b) the availability of experimental results conducted at the Basic Aerodynamics Research Tunnel...
Article
Offshore structures such as platform columns, risers operate under strong interactions with currents resulted in shedding of vortices in its wake. As offshore operations move farther into deeper seas the interactions become more complex under stronger currents and extreme sea states. Understanding the interactions between flow and structure respons...
Article
The increasing demand for offshore wind energy is leading the industry to look for expansions into deep oceans. This development has compelled the industry to venture in to floating offshore installations for wind turbines. The floating installations lead to complex rotor motions in 6 degrees of freedom. The current work focusses on various aerodyn...
Article
Full-text available
The characterization of the bileaflet mechanical heart valves (BMHVs) hinge microflow fields is a crucial step in heart valve engineering. Earlier in vitro studies of BMHV hinge flow at the aorta position in idealized straight pipes have shown that the aortic sinus shapes and sizes may have a direct impact on hinge microflow fields. In this paper,...
Article
The effects of the implantation angle of bileaflet mechanical heart valves (BMHVs) on the sinus region and downstream flow profiles were investigated. Three-dimensional numerical simulations of BMHVs were performed under physiologic pulsatile flow conditions. The study aim was to examine how the flow fields of different aortic sinus shapes and the...
Conference Paper
Most of the wind turbine analysis softwares widely being used in the market are based on the Blade Element Momentum method (BEM). The two important parameters that the BEM codes calculate are the axial and the tangential induction factors. These factors are calculated based on the empirical blade lift coefficient Cl and drag coefficient Cd along wi...
Article
Full-text available
We propose an automatic algorithm for the reconstruction of patient-specific cardiac mesh models with 1-to-1 vertex correspondence. In this framework, a series of 3D meshes depicting the endocardial surface of the heart at each time step is constructed, based on a set of border delineated magnetic resonance imaging (MRI) data of the whole cardiac c...
Article
The performance of a novel dew-point evaporative air cooler is theoretically investigated in this paper. The novel dew-point evaporative air cooler, based on a counter-flow closed-loop configuration, is able to cool air to temperature below ambient wet bulb temperature and approaching dew-point temperature. A computational model for the cooler has...
Article
Patient-specific computational fluid dynamics (CFD) modelling of the left ventricle (LV) is a promising technique for the visualisation of ventricular flow patterns throughout a cardiac cycle. While significant progress has been made in improving the physiological quality of such simulations, the methodologies involved for several key steps remain...
Conference Paper
This study is aimed to investigate the bio-mimetic swimmer propulsion mechanism with the use of its internal muscle force. A simplified articulated model, with multiple rigid segments connected by the joints (imitating the muscle force), is adopted to represent the real swimmer body. To modeling the problem, a Computational Fluid Dynamics (CFD) met...
Article
We propose an automatic algorithm for the reconstruction of a set of patient-specific dynamic cardiac mesh model with 1-to-1 mesh correspondence over the whole cardiac cycle. This work focus on both the reconstruction technique of the initial 3D model of the heart and also the consistent mapping of the vertex positions throughout all the 3D meshes....
Article
This paper contributes towards a more complete approach to capture very strong shocks in various applications of high speed compressible Navier–Stokes flows including blasts and explosions using second order finite volume method on unstructured grids. The HLLC Riemann solver is employed to solve for fluxes at cell interfaces with second order appro...
Article
The major disadvantage associated with the implantation of mechanical heart valves (MHVs) is the need for life long anti-coagulant therapy to prevent complications from thrombosis. Such patients with valve implants are affected by an increased risk of bleeding, infection and/or autoimmune response. High blood flow through the mechanical may activat...
Article
Full-text available
Mechanical heart valves (MHV) have been widely deployed as a routine surgical treatment option for patients with heart valve diseases due to its durability and performance. Understanding hemodynamics of MHV plays a key role in performance assessment as well as design. In this work, we propose a numerical method for simulations of full three dimensi...
Article
A numerical method for simulations of flow over variable geometries including deformable domains or moving boundaries is presented in the context of high-order discontinuous Galerkin (DG) methods in the framework of an arbitrary Lagrangian Eulerian (ALE) description to take into account the deformable domains where boundaries are moving with prescr...
Article
a b s t r a c t A discontinuous Galerkin method for solving hyperbolic systems of conservation laws involving inter-faces is presented. The interfaces are represented by a collection of element boundaries and their position is updated using an arbitrary Lagrangian–Eulerian method. The motion of the interfaces and the numer-ical fluxes are obtained...
Article
Shock capturing has been a challenge for computational fluid dynamicists over the years. This article deals with discontinuous Galerkin method to solve the hyperbolic equations in which solutions may develop discontinuities in finite time. The high order discontinuous Galerkin method combining the basis of finite volume and finite element methods h...
Article
The discontinuities in the solutions of systems of conservation laws are widely considered as one of the difficulties in numerical simulation. A numerical method is proposed for solving these partial differential equations with discontinuities in the solution. The method is able to track these sharp discontinuities or interfaces while still fully m...

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