Dr. Kourosh Shoele is an assistant professor in the Department of Mechanical Engineering at FAMU-FSU College of Engineering. Previously, he was an assistant research scientist in the Flow Physics and Computation Laboratory in the Department of Mechanical Engineering at Johns Hopkins University (2013-2016), research engineer at Re Vision LLC (2011-2013) and a post-doctoral research assistant (2011) in the Department of Structural Engineering at the University of California, San Diego (UCSD). He received his Ph.D. from the University of California, San Diego (UCSD) in 2011. His doctoral dissertation was about flow interaction with flexible structures. He received his M.Sc. from the Sharif University of Technology in 2006, and he received his B.Sc. from Shiraz University in 2003.
Research Themes: Dr. Shoele and his group are studying problems at the interface between mechanics and physics through developing and applying mathematical and computational tools with a focus on fluid-structure interaction, renewable energies, biolocomotion, and biomechanics.
Research Areas: Bio-inspired Engineering, Fluid-Structure Interaction, Biomechanics & Biomedical Flows, Wind & Wave Energies, Computational Mechanics.
Fluid-Structure Interaction (FSI) happens during the forced/free oscillations of the airfoil, fluttering of the flag(inverted/non-inverted) or the panel in the wind, pumping the blood inside the heart, vibrations of the wings of the airliner, efficient swimming of the fish in the deep sea and many more. FSI involves several interactions techniques known as flutter, galloping, sloshing, vortex-induced vibrations, added mass, and etc which are used to control the dynamics and motion of both the fluids and solids.
Nucleate boiling and active vortex generation
The nucleate boiling process is essential to achieve extreme heat flux in heat exchangers and cooling systems. We have proposed using active vortex generation to manipulate the boiling process dynamics. We have simulated the response of the boiling process in a heat exchanger channel to an oscillating flexible/rigid/hybrid plates and found out the extent of thermal enhancement and effects on dynamics of the vapor bubble. Our preliminary results show that surprisingly, a specific type of active vortex generators may enhance the thermal heat transfer by 500%-1000% much more than other proposed techniques. Considering the impact of active vortex generators compared to the crossflow-only case, we found out that by using a flexible insert, one can reach a 200%-250% increase in the coefficient of performance. The initial results suggest a promising technique to have a paradigm-shift heat transfer enhancement methodology especially for boiling heat transfer in microchannels using minimally invasive piezoelectric or magnetic vortex generators. Further studies will increase our understanding of the critical features of this process, also gives the suitable parameter regimes for experimental studies and practical applications. This may lead to an economical thermal management procedure using a passive system for the real-world applications.
SWBLI with flexible structure
When a shock wave comes into contact with a boundary layer flow, the large adverse pressure gradient associated with the shock wave can cause the flow to separate from the surface. When this happens, a recirculation bubble forms close to the wall, and significantly alters the stability and dynamics of the flow. This shock typically bends as it encounters lower Mach numbers inside the boundary layer and ultimately breaks up into a compression fan and a reflected shock develops. We are doing research on SWBLI with flexible structure focusing on structural load minimization and flow control. Panel dynamics can help us to find a potential use of an aeroelastically tailored flexible panel as a means of passive flow control. Cavity pressure underneath the panel can also create forced panel oscillations which may reduce separation in the interaction zone.
Dynamics of heated flexible panel
The canonical problem of flow-induced flutter of a thin flexible plate is revisited, with an emphasis on the thermally induced buoyancy effects on the dynamics and thermal characterization of the system. An immersed boundary method is used to simulate mixed convection of a heated 2D inextensible and flexible thin plate. The bending stiffness, Richardson number, and Reynolds number are chosen as the characteristic parameters of the system. The dynamic and thermal responses of the plate are examined over a wide range of the characteristic parameters, and it is shown that the stability boundary growth rate of the flapping dynamics dramatically increases after a particular threshold Richardson number due to the mode switching behavior. The appearance of higher oscillatory modes and a shift in the nodes of the dominant oscillatory mode are found to also be correlated to the observed higher Nusselt numbers.
Wind induced reconfigurations of trees
Wind induced stresses are the major mechanical cause of failure in trees. Our aim is to prevent tree failures from happening due to harsh hurricane–like conditions; helping the department of environment plant trees that have the right reconfiguration ability to withstand such conditions. Trees generally break at a point where they experience maximum stress. Through simulations analytical reasoning, we have seen that the prediction of the fracture risk and pattern of a tree is a function of their reconfiguration capabilities and how they mitigate large wind-induced stresses. Also, the probability of a tree breaking at any point depends on both the cross-section changes in the branching nodes and the level of tree flexibility. It has been noted that at an optimal branching, the stress experienced on a tree is uniform, thereby causing no weak link on the tree. This, in turn, doesn’t make the tree break during harsh conditions since there is no overstress throughout the cross-section of the tree. Prevention of tree failure will lead to a reduced power outage during storms.
Wind Turbine Aerodynamics
A computational model is used to study the effect of wave-induced motion on the aerodynamics of compliant offshore wind turbines. The wake response of two promising offshore platform concepts, Spar buoy and Barge type turbines were studied in details and their aerodynamic, power and wake characteristics were compared with a stationary wind turbine case. Results obtained from this study indicates that surprisingly the wake response of the oscillating wind turbine recovers faster compared to the stationary turbine, with a 50%wake recovery in a distance that is 33% shorter than the static counterpart.
Active Control of the Aeroelastic Flutter
Aeroelastic effect plays an important role in various research topics including aero vehicle stability, renewable energy extraction, and animal locomotion. Active and passive control methods have been proposed to control the flutter phenomenon of the airfoil. For example, the EET high-lift flexible wing with actively bending flaps provides an active actuator that can modify the flow around the airfoil. Through the use of a high-fidelity fluid-structure interaction algorithm we can investigate the effect on the aeroelastic motion of the EET airfoil over a wide range of parameters. Preliminary results show that the active flap is capable of regulating the oscillation period of the airfoil. The simulations can provide physical insight behind the highly nonlinear motion, and eventually derive the control law to regulate the oscillation.
Fast multilevel multi-phase CFD-nodal model for cryogenic applications
Cryogenic fluids are one of the critical components of current and future space exploration, and a better understanding of cryogenic flow is necessary for safe and efficient transport and storage of cryogenic fluids. This project aims to develop and employ novel modeling and analysis tools for capturing the flow physics and thermodynamics of cryogenic flows in storage vessels in both normal and microgravity conditions. The flow and thermal interaction of cryogenic systems with three phases of the flow, gas, and solid boundaries can generate a rich spectrum of phenomena. To accurately model the system while keeping the running time much lower than the conventional CFD approaches, the block-structured adaptive mesh refinement (AMR) is using. This project's main innovation is the development of an AMR-based computational tool based on the integration of the continuum multiphase-phase model of the cryogenic and the multi-node model of the system. The approach provides high-fidelity modeling of the complex coupled dynamics while maintaining the computational efficiency of nodal models.
Environment-informed vibration-based health monitoring technique
Traditional structural health monitoring (SHM) techniques are based on the strong assumption that the acting loads are either absent or stationary. In many high-speed applications, these criteria are not met, and a more versatile SHM method is required for their monitoring. In this work, we perform extended wavelet-based structural health monitoring using time histories of the embedded impedance-based piezoelectric sensors and the physics-based identification of the causal environmental loads. This technique is the first effort to extend the health monitoring to unsteady short-time load scenarios and use the physics-based force-partitioning technique for SHM under complex loading conditions. To perform SHM in the complex loading condition using impedance-based techniques, we include the mechanistic causal model of the flow forces in the identification procedure. This project breaks new ground in developing and employing a novel multi-physical modeling framework in which both the load conditions and structural responses are monitored simultaneously. Its success in capturing the structural damage is assessed numerically and experimentally for two types of damages, cracking and delamination, under two distinct loading conditions, high thermal loading and shock impingement.
The effect of internal damping on locomotion in frictional environments
The periodic motion or gaits of undulating animals arise as the result of a complex interaction of their central nervous system, muscle and connective tissue, bone, and their environment. Previous studies have assumed that sufficient internal force necessary to produce observed kinematics are always achievable, thus not focusing on an understanding of the inter-connection between muscle effort, body shape, and external reaction forces. This interplay in crawling animals is critical to locomotion performance. For soft robotic applications, internal damping is a parameter in the designer's control, the effect of which is not well understood. We study how the internal damping affects the locomotion performance of a crawler with a continuous, visco-elastic, nonlinear beam model. Crawler muscle actuation is modeled as a traveling wave of bending moment that propagates posteriorly along the body. Consistent with the friction properties of the scales of snakes and limbless lizards, environmental forces are modeled using anisotropic Coulomb friction. We find that by varying the crawler body's internal damping, the performance of the crawler can be altered and distinct gaits emerge. Indeed, we find that crawling direction can be changed by appropriate control of internal damping. Further, we identify the parameters that produce efficient crawling gaits.
Numerical investigation of energy harvesting from piezoelectric inverted flags
The transformation of wind energy into low-power electricity using piezoelectric materials enables the possibility of powering wireless electronic components especially in high wind areas. Here, we investigate the piezoelectric energy harvesting performance of inverted flags with different aspect ratio subject to unidirectional flow. Flags with different aspect ratios were studied both numerically and experimentally to explore the different oscillatory modes of the system and their different energy harvesting capability. Each flag is intrinsically coupled with the piezoelectric patches attached to its surfaces. As the piezo patches deform with the inverted flag, they generate electrical power which is dependent on the flow, structural and electrical parameters of the problem. Experiments on flags made of spring steel were conducted in a wind tunnel, where the wind speed was swept up through the various vibration modes of the inverted flags. The roles of flow conditions, structural parameters and electric setup on the oscillatory behavior and power capturing efficiency of the inverted flag were assessed and preliminary results show that the aspect ratio of the flag can be leveraged to increase the energy harvesting attainable during large amplitude two-sided flapping modes.
Post Doctorate Fellows
Mehdi received his Ph.D. in Applied Science in 2014 from University of California Davis. He has been working on development and application of numerical methods for multi-material and multi-phase systems. He is currently focused on the development of a general purposed Fluid-Structure Interaction (FSI) multiphase code to support the group endeavorer to study fundamental and real-world problems. He is also investigating the effects of active vortex generators of heat transfer and phase-change dynamics. You can find out more about his research and previous works at mehdivahab.com.
Vahid Tavanashad received his Ph.D. in Mechanical Engineering from Iowa State University in 2020. During his PhD studies, he developed a fully-resolved direct numerical simlation solver for buoyant particle-laden flows and used it to perform simulations of particle-fluid flow for physics discovery and model development. At CTML, his research will be focused on developing a multiphysics health monitoring framework for high-speed vehicles. In addition, he will study the fluid-structure interaction in suspension of deformable particles to examine the effect of deformability on the suspension rheology.
Al Shahriar is a Ph.D. Candidate in Mechanical Engineering Program at Florida State University since Fall 2017. His research concentrates on Fluid-Structure Interaction(FSI). More specifically, he is investigating fundamental and unsteady flow features of the shock wave and boundary layer interactions (SWBLI) over a flexible structure and how can the structural response be utilized to deal with this adverse flow phenomena. His research interest includes (but not limited to) High-speed flows, aerodynamic shape optimization, flow controls, FSI and CFD. He enjoys fine arts especially paintings, photography, table tennis, traveling and outdoor activities.
Alireza Moradikazerouni is pursuing a Ph.D. degree in Mechanical engineering at Florida State University (FSU) since Spring 2020. His research concentrates on NASA’s sloshing tank problems. More specifically, he is capturing the flow physics and thermodynamics of cryogenics flow in storage vessels in both normal and microgravity conditions using the block-structured adaptive mesh refinement (AMR). Interests include propulsion, high-speed flow, thermal stress/deformation, CFD, and FSI with specific applications to aerospace and energy. Skydiving, rock climbing, and bungee jumping lift his spirit.
Brian Van Stratum is a graduate student at Florida State University pursuing a Ph.D. in Mechanical Engineering. Brian joined the CTM Lab in 2020 to study the interaction of flexible cables with frictional and fluid environments. Brian has four years of experience in forensic engineering. In 2012-2017, he engaged in community development engineering research at Tribhuvan University in Nepal. Brian earned a B.S. in Mechanical Engineering in 2002 from Florida State University. Brian’s research interests are dynamics, controls, and robotics.
Jino is pursuing his PhD at FSU in Mechanical Engineering Dept. He graduated from Arizona State University with his MS in Mechanical Engineering in 2017. His Thesis was on "Extraction of Coherent Structures using Direct Numerical Simulation in 3D Turbulent Flows and Its Effects on Chemotaxis" . He was working as a Thermal Engineer in Arizona from 2017-2020 before he moved to FSU. He is working on Fluid Structure Interaction, Turbulence and Large Eddy Simulation models under Dr. Shoele. His other interests include Lagrangian-Eulerian coupling, Heat Transfer, Multiphase flows and using CFD/FEM for understanding Biophysical phenomena. He enjoys working out , playing soccer and hiking for leisure.
Oluwafemi is pursuing a PhD degree in mechanical engineering. He had his B.Tech in Metallurgical and Materials engineering in The federal university of technology, Akure, Nigeria during which he was an exchange student in his senior year at FAMU-FSU College of engineering. His current research interest is Fluid structure interaction of flexible structure for piezoelectric energy harvesting and the wind-induced reconfiguration of trees during hurricanes.
Graduated from Florida State University with a BS in Mechanical Engineering in 2016. Currently a PhD candidate with a focus in theoretical and numerical thermal fluids studies. Researching fluid-thermal-structure interactions and its application to thermal management and renewable energy generation. Interests include computational fluid dynamics (CFD), reduced order modeling (ROM), and optimization, with specific applications to energy.
Tso-Kang Wang is pursuing a Ph.D. degree in Mechanical Engineering. His research topic is about controlling the complicated interaction between flow and structures. The beauty and sophistication of Nature has been driving him to the research career, and his goal is to use what he has learnt to help this world become a more harmonic place. His favorite leisure activities are reading, basketball, and video games.
PhD Research Assistant
Patrick Eastham received his B.S. in Applied and Computational Mathematics from Florida State in 2015. He is currently at PhD student in the Biomathematics program at FSU. He was a research assistant for Dr. Shoele in 2017 and has since continued that line of research while being funded as a NSF GRFP Fellow. He has worked on the effect of variable-viscosity mechanisms on the swimming and feeding efficiency of microorganisms with applications towards artificial microswimmers, and more generally is interested in problems in biofluidmechanics.
Former Group Members
Postdoctoral Research Associate
Mohamad Aslani received his Ph.D. from the Department of Aerospace Engineering at Iowa State University in 2017. Before joining CTML, he was a Postdoctoral fellow in the Department of Mathematics at Florida State University where he worked on direct numerical simulation of compressible flows using the adaptive wavelet collocation method. Dr. Aslani has been involved in multiple multidisciplinary projects including multiphase flows, combustion, optimization, and machine learning. At CTML, his research will be focused on developing a Multiphysics Health Monitoring Framework for high-speed vehicles and developing numerical methods for compressible multiphase flows. You can find more about his research at myweb.fsu.edu/maslani
Karsten Mikal Kopperstad received his Bachelor's degree in mechanical engineering at the University of Stavanger in Stavanger, Norway. Prior to this he served in the Norwegian Royal Navy as a fulfillment of his Norwegian citizenship duties . Karsten is now currently pursuing a Master's degree in mechanical engineering at FAMU-FSU College of Engineering, under the guidance of Dr. Koroush Shoele and Dr. Rajan Kumar. Karsten is working as a graduate research assistant at the Florida Center for advanced Areo Propulsion facility located in Tallahassee, Florida. His research interest includes experimental and computational fluid mechanics, fluid structure interaction, and renewable energy. During his pursuit for his master’s, Karsten is conducting research of the aerodynamic properties found in the wake regime behind a floating wind turbine.
Gokhan Ozkan received his BS degrees in Teacher Training in Electrical Field and Energy System Engineering from Marmara University and Erciyes University, Turkey in 2006 and 2014, and his MS in Energy System Engineering from Erciyes University, Turkey in 2016. He was a lecturer at Bozok University, Turkey. He is currently a PhD candidate in Electrical and Computer Engineering at FAMU-FSU College of Engineering, and is working as a graduate research assistant at the Center for Advanced Power Systems. His research interests include control of renewable energy, especially wind energy, electricity generation, distribution, and transmission. His Areas of experties are Renewable energy, Controls, Wind energy systems.
Young Scholars Program (YSP)
The Young Scholars Program (YSP) is a six-week residential science and mathematics summer program for Florida high school students with significant potential for careers in the fields of science, technology, engineering, and mathematics. The program was developed in 1983 and is currently administered by the Office of Science Teaching Activities in the College of Arts and Sciences at Florida State University. This year Aaron Allen and Matthew Crespo joined our lab at AME in Engineering Campus. They learned about the fundamentals of fluid dynamics and basic procedure to conduct experiments. They also gained knowledge on state of the art technology used in this field.
The FAMU-FSU College of Engineering is offering family-friendly STEM activities, including hands-on engineering stations and interactive science exhibits, aimed at bringing the science of engineering to the public during its 2019 Open House. The annual event takes place from 11 a.m. to 4 p.m. on Saturday, Feb. 23 at the college’s campus at 2525 Pottsdamer St. in Innovation Park.
Research Experiences for Undergraduates (REU)
The Research Experiences for Undergraduates (REU) program supports active research participation by undergraduate students in any of the areas of research funded by the National Science Foundation. REU projects involve students in meaningful ways in ongoing research programs or in research projects specifically designed for the REU program.
Ph.D. Position –Computational Fluid Dynamics, Machine Learning and Fluid-Structure Interaction