• On the spreading of non-canonical thermals from direct numerical simulations 

  Liu, Kai; Zgheib, N.; Balachandar, S.

  We present results from direct numerical simulations on laminar and turbulent non-canonical thermals with an initial rectangular density distribution at a Reynolds number of Re = 500 and Re = 5000, respectively. We find ...
• The role of the thermal conductivity of steel in quantitative elastohydrodynamic friction 

  Habchi, Wassim; Bair, Scott

  Numerical models for thermal elastohydrodynamic lubricated contacts of steel surfaces have always employed a value for the thermal conductivity of steel corresponding to its soft annealed alloy state. However, steel in ...
• Influence of Realistic Lubricant Density-Pressure Dependence on the Stiffness of Elastohydrodynamic Lubricated Contacts 

  Issa, J. S.; Habchi, W.

  The analysis of the dynamic response of elastohydrodynamic lubricated contacts has often invoked a universal law for lubricant density–pressure dependence, even though the densities of many lubricants exhibit a substantial ...
• Exact tuning of a vibration neutralizer for the reduction of flexural waves in beams 

  Issa, Jimmy S.

  In this work, designs of vibration neutralizers for the reduction of flexural waves in beams are proposed. The system considered consists of an Euler-Bernoulli beam experiencing a harmonically travelling wave. The neutralizer, ...
• A novel connection setup management approach for optical wdm networks 

  Fawaz, Wissam; Chen, Ken; Abou-Rjeily, Chadi

  Wavelength Division Multiplexing (WDM) has significantly increased the transmission capacity of today's optical networks. An increase in the available bandwidth is promoting at the same time the introduction of new services, ...
• Spreading of non-planar non-axisymmetric gravity and turbidity currents 

  Zgheib, Nadim; Bonometti, Thomas; Balachandar, S.

  The dynamics of non-axisymmetric turbidity currents is considered here. The study comprises a series of experiments for which a finite volume of particle-laden solution is released into fresh water. A mixture of water and ...
• Mapping corruption in public roads construction in Lebanon. (c2019) 

  Saba, Rami Elias (Lebanese American University, )

  Corruption in public works construction is a problem that governments and political administrations have to contend with all over the world. Lebanon is no stranger to this situation with the country ranking in the most ...
• Receiver design for MIMO FSO communication systems with photon-counting detection. (c2019) 

  Mawla, Rami Issam El (Lebanese American University, )

  Optical wireless communication (OWC) constitutes a key technology for 5G wireless networks. OWC alleviates the radio frequency (RF) spectrum crunch problem by enabling communications in the visible, infrared and ...
• PIV and CFD investigation of flocculation hydrodynamics. (c2019) 

  Danageuzian, Hrair Razmig (Lebanese American University, )

  The performance of paddle flocculators in water treatment is highly influenced by the basin hydrodynamics. In their design, several hydrodynamic and geometric parameters are required to ensure the efficiency of the process. ...
• Two-way coupled direct numerical simulations of sinuous-crested bedforms 

  Zgheib, Nadim; Balachandar, S.

  We present results from direct numerical simulations on the transition from straight-crested to sinuous-crested bedforms. The numerical setup is representative of turbulent open channel flow over an erodible sediment bed ...
• Bedform dynamics from coupled bed-flow direct numerical simulations 

  Zgheib, N.; Fedele, J. J.; Hoyal, D. C. J. D.; Perillo, M. M.; Balachandar, S.

  We present results of time-evolving coupled direct numerical simulations between an erodible bed and an overlying pressure-driven, turbulent flow field. A total of 6 simulations are considered, the details of which are ...
• Long-lasting effect of initial configuration in gravitational spreading of material fronts 

  Zgheib, Nadim; Bonometti, Thomas; Balachandar, S.

  We present the results from laboratory experiments and fully resolved simulations pertaining to finite-release turbulent density flows with a non-axisymmetric initial shape. First, we demonstrate that the effects of the ...
• Direct numerical simulation of cylindrical particle-laden gravity currents 

  Zgheib, N.; Bonometti, T.; Balachandar, S.

  We present results from direct numerical simulations (DNS) of cylindrical particle-laden gravity currents. We consider the case of a full depth release with monodisperse particles at a dilute concentration where particle–particle ...
• Dynamics of non-circular finite-release gravity currents 

  Zgheib, N.; Bonometti, T.; Balachandar, S.

  The present work reports some new aspects of non-axisymmetric gravity currents obtained from laboratory experiments, fully resolved simulations and box models. Following the earlier work of Zgheib et al. (Theor. Comput. ...
• Front dynamics and entrainment of finite circular gravity currents on an unbounded uniform slope 

  Zgheib, N.; Ooi, A.; Balachandar, S.

  We report on the dynamics of circular finite-release Boussinesq gravity currents on a uniform slope. The study comprises a series of highly resolved direct numerical simulations for a range of slope angles between 5 and ...
• Front dynamics of elliptical gravity currents on a uniform slope 

  Zhu, S. J.; Zgheib, N.; Balachandar, S.

  In the present investigation, we report data from direct numerical simulations of elliptical, finite release, Boussinesq gravity currents propagating down a uniform slope. The study comprises a series of simulations of ...
• Suspension-driven gravity surges on horizontal surfaces 

  Zgheib, N.; Bonometti, T.; Balachandar, S.

  We present results from highly resolved direct numerical simulations of canonical (axisymmetric and planar) and non-canonical (rectangular) configurations of horizontal suspension-driven gravity surges. We show that the ...
• Direct numerical simulation of transverse ripples. 2. Self‐similarity, bedform coarsening, and effect of neighboring structures 

  Zgheib, N.; Fedele, J. J.; Hoyal, D. C. J. D.; Perillo, M. M.; Balachandar, S.

  Coupled bed‐flow direct numerical simulations investigating the early stages of pattern formation and bedform (ripple) interactions were examined in a previous paper (Part 1), making use of the resolved flow field. In this ...
• Direct numerical simulation of transverse ripples. 1. Pattern initiation and bedform interactions 

  Zgheib, N.; Fedele, J. J.; Hoyal, D. C. J. D.; Perillo, M. M.; Balachandar, S.

  We present results of coupled direct numerical simulations between flow and a deformable bed in a horizontally periodic, turbulent open channel at a shear Reynolds number of Reτ = 180. The feedback between the temporally ...
• Linear stability analysis of subaqueous bedforms using direct numerical simulations 

  Zgheib, N.; Balachandar, S.

  We present results on the formation of ripples from linear stability analysis. The analysis is coupled with direct numerical simulations of turbulent open-channel flow over a fixed sinusoidal bed. The presence of the ...

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