Hydrodynamics of a tandem fish school with asynchronous undulation of individuals

MSU Khalid, I Akhtar, H Dong - Journal of Fluids and Structures, 2016 - Elsevier
We perform numerical simulations using immersed boundary method for flow over a single
and two fish in tandem performing traveling wave like motion for a range of Strouhal …

Mobility and singularity analysis of a class of two degrees of freedom rotational parallel mechanisms using a visual graphic approach

J Yu, X Dong, X Pei, X Kong - 2012 - asmedigitalcollection.asme.org
In this paper, a visual graphic approach is presented for the mobility and singularity analysis
of mechanisms with no helical pair. The presented method is established upon the …

Using functional gains for effective sensor location in flow control: a reduced-order modelling approach

I Akhtar, J Borggaard, JA Burns, H Imtiaz… - Journal of Fluid …, 2015 - cambridge.org
The problem of active feedback control of fluid flows falls into a class of problems in the area
of distributed parameter control. Distributed parameter systems are typically defined by …

A van der Pol–Duffing oscillator model of hydrodynamic forces on canonical structures

I Akhtar, OA Marzouk, AH Nayfeh - 2009 - asmedigitalcollection.asme.org
Numerical simulations of the flow past elliptic cylinders with different eccentricities have
been performed using a parallel incompressible computational fluid-dynamics (CFD) solver …

Parallel simulations, reduced-order modeling, and feedback control of vortex shedding using fluidic actuators

I Akhtar - 2008 - vtechworks.lib.vt.edu
In most of the engineering and industrial flow applications, one encounters fluid-structure
interaction. This interaction can lead to some undesirable forces acting on the structure …

A nonlinear dynamic model for unsteady separated flow control and its mechanism analysis

G Huang, W Lu, J Zhu, X Fu, J Wang - Journal of Fluid Mechanics, 2017 - cambridge.org
In the analysis of the interaction between external periodic excitation and unsteady
separated flow in controlling the flow separation, a new nonlinear approximate model has …

Modeling steady-state and transient forces on a cylinder

O Marzouk, AH Nayfeh, I Akhtar… - Journal of Vibration and …, 2007 - journals.sagepub.com
Numerical simulations of the flow past a stationary circular cylinder at different Reynolds
numbers (Re) have been performed using a computational fluid dynamics (CFD) solver that …

Numerical assessment of RANS turbulence models for the development of data driven Reduced Order Models

MS Siddiqui, A Rasheed, T Kvamsdal - Ocean Engineering, 2020 - Elsevier
The ability to accurately predict vortex shedding around wind turbine blades is paramount,
particularly at high Reynolds number. Turbulence models employed in the numerical studies …

Micropatterned Treads for In Vivo Robotic Mobility

LJ Sliker, X Wang, JA Schoen, ME Rentschler - 2010 - asmedigitalcollection.asme.org
Despite revolutionary advances in many fields of medicine, there are no active mobile in
vivo devices commercially available, or in use, today. Several research groups are actively …

Higher‐Order Spectral Analysis to Identify Quadratic Nonlinearities in Fluid‐Structure Interaction

I Akhtar, M Elyyan - Mathematical Problems in Engineering, 2018 - Wiley Online Library
Hydrodynamic forces on a structure are the manifestation of fluid‐structure interaction. Since
this interaction is nonlinear, these forces consist of various frequencies: fundamental …