About
17
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Introduction
I am a Research Engineer II at the School of Civil and Environmental Engineering at the Georgia Institute of Technology. My academic research focuses on turbulence, experimental fluid mechanics, hydrodynamic instability, and biofluids.
Current institution
Additional affiliations
August 2014 - May 2019
May 2019 - June 2022
August 2010 - December 2011
Education
May 2014 - April 2019
August 2012 - February 2014
July 2008 - September 2010
Publications
Publications (17)
The effects of incident shock strength on the mixing transition in the Richtmyer–Meshkov instability (RMI) are experimentally investigated using simultaneous density–velocity measurements. This effort uses a shock with an incident Mach number of 1.9, in concert with previous work at Mach 1.55 (Mohaghar et al., J. Fluid Mech., vol. 831, 2017 pp. 779...
The swimming characteristics achieved by flapping wings, translating motion, and shell pitching are studied from observations of shelled Antarctic pteropods (aquatic snails nicknamed 'sea butterflies'). These pteropods (Limacina helicina antarctica) swim with a pair of parapodia (or "wings") via a unique flapping propulsion mechanism that incorpora...
To provide insight to the dynamics of weakly non-linear standing internal waves, the density and velocity fields are measured using combined planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV) techniques. A laboratory scale apparatus was created to generate standing internal waves in a two-layer stratified system. Experime...
The flow field around bioinspired magnetic-responsive soft materials that mimic the symmetry-breaking mechanisms in swimming animals, such as pteropods and manta rays, is studied using the tomographic particle image velocimetry (tomo-PIV) technique. Magnetic-responsive material appendages are actuated by an oscillating external magnetic field. The...
The hydrodynamic disturbance generated by the adult copepod Euchaeta antarctica during cruise swimming is quantified. Kinematic results are compared to previous results reported for different Euchaeta species. The results reveal a linear relationship between cruise speed and prosome length across Euchaeta species, indicating a size-proportional tre...
https://youtu.be/8iDaaBlwD9c?si=LSoCZ3-uJhxoxERh
The effect of initial perturbations on the evolution of the inclined Richtmyer-Meshkov turbulent mixing layer before and after reshock initiated by a shock wave with Mach number 1.55 is investigated through three-dimensional (3D) simulations using the FLASH code. The 3D simulations aim to reproduce both predominantly single-mode and mul-timode inte...
Internal waves are ubiquitous in the ocean. They often form in regions of high temperature or salinity variability as the pycnocline oscillates to form the wave (Phillips, 1966). They can be generated either from the interaction of tidal currents with submarine bathymetry (Garrett and Kunze, 2007) or by wind stress at the ocean surface (Munk and Wu...
This experimental study investigates the effects of Reynolds number (5000≤Re≤20000, where Re=UH/ν) and initial release diameter (2.2 mm ≤D≤ 9.4 mm) on the scalar power spectra, fractal geometry, and turbulent length scales of high-Schmidt-number passive scalar fields resulting from an isokinetic release in a turbulent boundary layer. The turbulence...
Internal waves are ubiquitous features in coastal marine environments and have been observed to mediate vertical distributions of zooplankton. Internal waves possess fine-scale hydrodynamic cues that copepods and other zooplankton are known to sense, such as fluid density gradients and velocity gradients (quantified as shear strain rate). The role...
This thesis presents results on the effects of initial conditions (single- and multi-mode) and incident shock wave Mach numbers (M) on several mixing characteristics in Richtmyer-Meshkov instability (RMI) evolution. These goals are achieved by performing two different experimental campaigns using a shock strength with an incident Mach number of 1.9...
Using recent advancements in optical diagnostic technologies (both in imaging and illumination), field measurements using simultaneous PIV and PLIF are presented to investigate the instability, evolution and mixing behavior of Richtmyer-Meshkov Instability (RMI). These measurements enable capture of the temporal evolution of the small scale mixing...
The effect of initial conditions on transition to turbulence is studied in a variable-density shock-driven flow. Richtmyer–Meshkov instability (RMI) evolution of fluid interfaces with two different imposed initial perturbations is observed before and after interaction with a second shock reflected from the end wall of a shock tube (reshock). The fi...
An experimental study of a twice-accelerated Richtmyer–Meshkov instability, where reshock provides the second acceleration, focusing on the effects of initial conditions and circulation deposition is presented. Experiments were performed using the inclined shock tube facility at the Shock Tube and Advanced Mixing Laboratory. Three experimental case...
![Figure 1. The various wave energy technologies [2]](profile/Mohammad-Mohaghar/publication/322103994/figure/fig1/AS:576677479501824@1514502033773/The-various-wave-energy-technologies-2_Q320.jpg)
In the presented work, Delft3D, a coastal hydrodynamic modeling system, capable of simulating hydrodynamic processes due to waves, tides, rivers, winds and coastal currents, is used to predict the nearshore wave energy in Matosinhos, Portugal. DelftDashboard is then used in co-operation to make a precise grid and bathymetry for our wave model. The...
