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CTR events

Building a Credible, Open-source High-fidelity Computational Fluid Dynamics Tool Suitable for Renewable Wave Energy Applications

CTR Tea : Friday, December 2, 2022 - 4:15pm : Speaker(s): Dr. Stefan P. Domino, Computational Thermal & Fluid Mechanics Department, Sandia National Laboratory; Institute for Computational & Mathematical Engineering, Stanford
Abtract:

In this presentation, an unstructured, low-Mach, balanced-force, volume of fluid numerical methodology is overviewed whose prime objective is to target the modeling of wave-based renewable energy devices using high-fidelity computational fluid dynamics approaches. A control volume finite element numerical discretization, which includes novel residual-based stabilization for the volume of fluid equation, is established. Although WEC mod/sim requirements lack typical multiphysics complexities, other technical challenges exist, such as ensuring non-diffusive fluid transport in the presence of... Read More

Bio:
Dr. Stefan Domino’s research interest rests within low-Mach fluid mechanics methods development for complex systems that drive the coupling of mass, momentum, species and energy transport. His core... Read More

A Statistical Approach for Fast and Reliable Prediction of Room-Scale Airborne Viral Contagion

CTR Tea : Friday, November 4, 2022 - 4:15pm : Speaker(s): Professor S. Balachandar, Department of Mechanical & Aerospace Engineering, University of Florida
Abtract:

The risk of airborne viral contagion in indoor spaces is a multidisciplinary problem involving a wide range of parameters. From a fluid mechanics perspective, the problem of infectivity can be divided into an ejection-scale problem and a room-scale problem. The ejection-scale problem aims to answer the question of what range of droplet sizes remain airborne as a result of expiration activities of a sick person. A theoretical framework was developed to answer this question and validated with high-fidelity simulations. It is shown that the risk of infection is heightened when the droplet evap... Read More

2022 CTR SUMMER PROGRAM FINAL PRESENTATIONS

Summer Program : Friday, August 12, 2022 - 8:00am to 5:00pm
Abtract:

7:30 AM Breakfast

8:30 AM Introduction: Parviz Moin

8:45 AM MULTIPHASE AND PARTICLE-LADEN FLOWS
Coordinator(s): Shahab Mirjalili and Suhas S. Jain

8:50 AM Supercritical Miniaturization of Wall-Bounded Turbulence Physics-compatible simulations & data-driven dimensional analysis
Authors: Lluís Jofre Cruanyes and Marc Bernades (Universitat Politecnica de Catalunya – Barcelona Tech)
Host: Kazuki Maeda

Improving volume-averaged mult... Read More

Interface-resolved simulations of multiphase turbulent flows: Achievements and new challenges

Tutorial : Wednesday, August 10, 2022 - 4:00pm to 5:30pm : Speaker(s): Luca Brandt
Abtract:

In this tutorial, we offer an overview on the achievements and challenges of interface-resolved simulations of multiphase turbulent flows. The focus will therefore be on micro- and meso-scale simulations, needed to provide fundamental physical insights as well as quantitative information to large-scale models, e.g. LES and two-fluid Continuum models. We will first consider the case of rigid particles, which has probably seen the most significant achievements over the last decade, and where we believe resolved numerical simulations are a well-established tool. Secondly, we will consider two-... Read More

The transition to hydrogen: simulations of the future engines and of safety scenarios

Tutorial : Friday, August 5, 2022 - 4:00pm to 5:30pm : Speaker(s): Thierry Poinsot
Abtract:

This talk will present future energy policies and the place of hydrogen. The introduction of hydrogen in aerospace propulsion will be specially discussed as well as the implications of hydrogen use for safety issues. Finally the numerical simulations of hydrogen combustion will be discussed.

Presentation: Video

Bio:
CERFACS and IMFT, Toulouse, France

MIDTERM PROGRESS REPORTS

Summer Program : Monday, August 1, 2022 - 8:30am to 2:00pm
Abtract:

7:30 AM Breakfast

8:30 AM Introduction: Parviz Moin

DATA-DRIVEN TURBULENCE MODELING AND ENGINEERING APPLICATIONS

8:40 AM I. Data-Driven Methods
Coordinator(s): Peter Schmid and Christopher Williams

8:45 AM Data-driven reduction of lookup-libraries for the simulation of non-equilibrium effects in hypersonic flows
Author(s): Peter Schmid (KAUST), Georgios Rigas (Imperial College London), Taraneh Sayadi, and Clement Scherding (Sorbonne Uni... Read More

Resolvent analysis of turbulent flows

Tutorial : Friday, July 29, 2022 - 2:00pm to 3:30pm : Speaker(s): Beverley McKeon
Abtract:

The resolvent framework provides a simple, but rigorous, approach by which to analyze linear amplification in turbulent flows and frame nonlinear turbulent closures. Analysis of the resolvent identifies the linear amplification associated with harmonic forcing of the linearized Navier-Stokes equations, which give rise to a non-normal operator.  By associating this forcing with the quadratic nonlinearity, the full turbulence field can be expressed as a linear combination of weighted, nonlinearly interacting modes. After a brief review of the basic approach, recent developments and the connec... Read More

Machine learning for turbulence modeling

Tutorial : Friday, July 22, 2022 - 4:00pm to 5:30pm : Speaker(s): Adrián Lozano-Durán (MIT)
Abtract:

In this tutorial, we offer an overview of different machine learning (ML) methodologies for turbulence modeling. The main focus is on RANS and LES but other reduced-order models are also discussed. First, the distinction between models and methods is highlighted. The different ML approaches are introduced according to three classifications: i) the level of modeling form of closure terms, ii) machine learning methodology and, iii) the neural network architecture. A selected number of works are used to illustrate the ML approaches. Finally, we address the question: What can we do with machine... Read More

PROGRAM PRESENTATION OF RESEARCH PLANS

Summer Program : Monday, July 18, 2022 - 10:00am to 4:00pm
Abtract:

DATA-DRIVEN TURBULENCE MODELING AND ENGINEERING APPLICATIONS

10:00 AM Introduction: Parviz Moin 

10:20 AM I. Data-Driven Methods 
Coordinator(s): Peter Schmid and Christopher Williams

10:25 AM Data-driven reduction of lookup-libraries for the simulation of non-equilibrium effects in hypersonic flows
Author(s): Peter Schmid (KAUST)... Read More

Registration for Participants

Summer Program : Sunday, July 17, 2022 - 3:00pm to 6:00pm
Abtract:

Lathrop (2nd Floor)
518 Memorial Way
Stanford, CA 94305

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