Skip to content Skip to navigation

CTR events

CTR Summer Research Opportunity

: Summer Program
Sunday, June 26, 2016 - 9:00am to Friday, July 22, 2016 - 5:00pm
Abtract:

The Center for Turbulence Research invites applications for participation in its 16th biennial summer research program. The objective of the program is to promote development and evaluation of new ideas in turbulence research. It is expected that novel ideas and preliminary results generated during the summer program will be of sufficiently high caliber to lead to publications and to provide grounds for new research in the participants' home institutions.

Interested scientists may consider submitting proposals in broad areas of multi-physics turbulent flow research. Examples of broad... Read More

31st Symposium on Naval Hydrodynamics

: Conference
Sunday, September 11, 2016 - 9:00am to Friday, September 16, 2016 - 5:00pm
Speaker(s):
Prof. Parviz Moin, Stanford University, Dr. Ki-Han Kim, U.S. Office of Naval Research
Abtract:

The 31st Symposium on Naval Hydrodynamics will be held in Monterey, California, during the week of Sunday, September 11 through Friday, September 16, 2016.  The Symposium is jointly organized by the U.S. Office of Naval Research and Stanford University, Center for Turbulence Research.

Optimal Design by Morphing

: Tea Seminar
Friday, March 11, 2016 - 4:15am
Speaker(s):
Professor Philip Marcus, University of California, Berkeley
Abtract:

We present a new method, which we call design-by-morphing, for the optimal design of the shape of an object. Traditional morphing methods, which require covering the surface of an object with a large number (typically millions) of triangular meshed points, cannot be used in searches for optimal designs because traditional morphing methods break down without human intervention. With our new methodology, the surfaces of one or more objects (or the sub-objects from which they are composed) are represented as truncated series of exponentially-convergent spectral basis functions multiplied by sp... Read More

Bio:
Philip Marcus is a Professor of Fluid Dynamics, Mechanical Engineering, at the University of California, Berkeley where he heads the Computational Fluid Dynamics Laboratory. His research group is... Read More

Tracking eddies in wall-bounded turbulence

: Tea Seminar
Friday, March 4, 2016 - 4:15pm
Speaker(s):
Adrian Lozano-Duran, CTR Postdoctoral Fellow
Abtract:

Eddies, understood as regions of the flow, which maintain spatial and temporal coherence,     are widely used by the turbulence community as a conceptual model to organize and understand the flow. However, are they really there?  Can they be identified and tracked in time?  The present talk deals with the temporal evolution of vortices and eddies responsible for the momentum transfer in turbulent channels studied via time-resolved direct numerical simulation at high Reynolds numbers in a five hundred Terabytes database.

Eddies are identified as connected regions of the flow above a p... Read More

Bio:
Dr. Adrian Lozano-Duran received his PhD from the Technical University of Madrid in 2015 at the Computational Fluid Mechanics Laboratory headed by Professor J. Jiménez. His main research has... Read More

High Reynolds Number Smooth/Rough-wall Turbulent Boundary Layers

: Tea Seminar
Friday, February 26, 2016 - 4:15pm
Speaker(s):
Xiang I. A. Yang, Mechanical Engineering Department, Johns Hopkins University
Abtract:

We use tools including Large-eddy-simulations, wind tunnel experiments and the framework provided by the Townsend attached eddy hypothesis to study the flow physics in high Reynolds number turbulent boundary layers. We developed a hierarchical random additive process model (HRAP) for the cascading process in wall bounded flows. With this HRAP, a new family of two-point logarithmic scalings in the inertial region is discovered and confirmed using the experiment data from the Melbourne HRNBLWT. The scalings of single-point, two-point moment-generating-functions in high Reynolds number wall bo... Read More

Bio:
Xiang I. A. Yang is currently a Ph.D. candidate in Mechanical Engineering Department of the Johns Hopkins University. He received M.S. in Mechanical Engineering from the Johns Hopkins University. His... Read More

Modeling and understanding of supercritical injection

: Tea Seminar
Friday, February 19, 2016 - 4:15pm
Speaker(s):
Daniel Banuti, CTR Postdoctoral Fellow
Abtract:

Despite being ubiquitous in technical applications (gas turbines, diesel engines, rocket engines), supercritical injection is generally considered not well understood. Far from idealized gaseous or liquid fluid behavior, there is to this date no real understanding of the underlying physical processes. Nonetheless, accurate modeling and understanding are key factors for effective CFD modeling and optimization of the technical systems.

The present talk discusses a new thermodynamic view of supercritical state transitions akin to vaporization - pseudo-boiling. The talk introduces 'pseud... Read More

Bio:
Dr. Daniel Banuti's focus is CFD model development and thermodynamics of high pressure injection. Before joining the Center for Turbulence Research at Stanford University, Daniel Banuti was a... Read More

Development and Applications of PDE Solvers on Octree Adaptive Grids

: Tea Seminar
Friday, January 29, 2016 - 4:00am
Speaker(s):
Frederic Gibou, Professor and MechE Graduate Program Director, University of California, Santa Barbara
Abtract:

It is well recognized that computational science is the third pillar of discovery along with theory and experiments. The challenges to modern scientific computing are (1) multiscale nature of most important physical phenomena, with a dynamic coupling between smaller and larger scales, (2) the need to impose non-trivial boundary conditions on irregular domain or on moving boundaries and (3) the need to perform large 3 dimensional simulations.

Professor Gibou’s research group’s strategy is to develop computational methods on Cartesian grids. The advantage of this approach is that they... Read More

Bio:
Professor Gibou is a faculty member in the Department of Mechanical Engineering, in the Department of Computer Science and in the Department of Mathematics at the University of California, Santa... Read More

Multiscale challenges in direct numerical simulation of multiphase flows

: Tea Seminar
Friday, January 15, 2016 - 4:00am
Speaker(s):
Bahman Aboulhasanzadeh, Postdoctoral Research Fellow, University of Michigan
Abtract:

In the past couple of decades, computational fluid dynamics of multiphase flows has evolved tremendously. With the fast growth in computational power, researchers who once had been bounded to study the problems in small domains or for very limited number of bubbles or droplets, now are able to do the simulations of more realistic problems or to look at additional physics. However, computational simulation of multiphase flows can become exponentially expensive when thin films appears in the physical domain, either as a results of interactions between interfaces or the existence of different... Read More

Bio:
Bahman Aboulhasanzadeh received his Ph.D. in Aerospace and Mechanical Engineering from the University of Notre Dame in 2014 and he has been a postdoctoral research fellow at the University of... Read More

A LES study of interactions between wind turbine wakes and the atmospheric boundary layer

: Tea Seminar
Friday, January 8, 2016 - 4:00pm
Speaker(s):
Shengbai Xie, Graduate Research Assistant, University of Delaware
Abtract:

It is critical to understand how wind turbine wakes interact with the atmospheric boundary layer (ABL) in order to better estimate the wake loss in a wind farm. The ABL is a complex system affected by various forces, e.g., pressure gradient force (PGF), Coriolis force, buoyancy force due to thermal stability, and shear force imposed by the ground, etc. The wind shear and turbulence level in the ABL is strongly influenced by the thermal stability conditions, which in turn affects the properties of wind turbine wakes [1]. Meanwhile, the Coriolis force interacts with the wind shear and the PGF... Read More

Bio:
Shengbai Xie received his PhD from University of Delaware in 2015. His PhD work was mainly focused on numerical simulations of wind turbine wakes and the atmospheric turbulence. He also has a master... Read More

Particle based simulation of turbulent sediment transport processes

: Tea Seminar
Friday, December 11, 2015 - 4:00pm
Speaker(s):
Justin Finn, Research Associate, University of Liverpool (UK)
Abtract:

The transport of sediments due to turbulent wave, current, and tidal flows can have lasting social and environmental consequences. This makes the development of improved predictive capabilities for sediment motion an engineering priority, and motivates fundamental investigations of particle-particle and particle-turbulence interactions in coastal, fluvial, and estuarine boundary layers. In this talk, I will first present practical multiphase modeling guidelines for conducting such simulations within a DNS/LES framework by recasting the particle Reynolds and Stokes number scaling from [1] in... Read More

Bio:
Justin Finn received degrees in Mechanical Engineering from Oregon State University (PhD, Msc) and the University of Massachusetts (BSc). His graduate work involved simulation of flow in porous media... Read More

Pages