7 papers
How do flapping avian wings exhibit superior aerodynamic performance?
Dilip Thakur, Muhammad Saif Ullah Khalid
This work investigates the unsteady aerodynamic performance and vortex dynamics of avian-inspired flapping wings using our in-house sharp-interface immersed-boundary solver, VorteX…
From Dead-Band to Steady Rotation: Three-Dimensional Vortex Dynamics of Self-Starting Vertical-Axis Wind Turbines
Faisal Muhammad, Basel Ismail, Muhammad Saif Ullah Khalid
The self-starting behavior of vertical-axis wind turbines is strongly influenced by the development of vortical structures along the span. However, a fully coupled high-fidelity th…
Wing-Rotor Aerodynamic Interactions in Small UAVs During Hover and Cruise
Dev Pradeepkumar Nayak, Seungmin Choi, Muhammad Saif Ullah Khalid
A compact vertical take-off and landing aircraft requires the same tilt-rotor configuration to perform two fundamentally different aerodynamic tasks: sustain hover and deliver effi…
Design Implications of Chord Length and Number of Blades on Self-Starting Process in Vertical-Axis Wind Turbines
Faisa Muhammad, Muhammad Saif Ullah Khalid
Self-starting remains a key limitation of lift-driven vertical-axis wind turbines and is strongly influenced by geometric design choices that also govern steady-state performance.…
Dynamical Characteristics of the Body-Caudal Fin Joint of a Carangiform Swimmer and its Influence on Hydrodynamics
Dev Pradeepkumar Nayak, Muhammad Saif Ullah Khalid, Ali Tarokh
The hydrodynamics of fish swimming depend on the interaction between the undulation of the body and the flapping of the caudal fin. This study develops a computational framework of…
Vortex Dynamics from Burst-and-Coast Motion of Anguilliform and Carangiform Swimmers
Zahra Maleksabet, Maham Kamran, Ali Tarokh +1
Fish perform various propulsive maneuvers while swimming by generating traveling waves along their bodies and producing thrust through tail strokes. Anguilliform swimmers spread mo…
Comparative Investigations on Active and Passive Tails of Undulating Swimmers
Dev Pradeepkumar Nayak, Ali Tarokh, Muhammad Saif Ullah Khalid
Fish display remarkable swimming capabilities through the coordinated interaction of the body and caudal fin, yet the potential role of a passively pitching tail in enhancing hydro…