Training Day

Supplementary to the Workshop, a Training Day will be offered on June 7, 2021 between 9:00 AM and 2:30 PM EDT. The training is most suitable for researchers who are familiar with the principles of SPH but are beginning their work in the field. More experienced SPH developers and users may find that the training day is a useful opportunity for sharing insights and ideas. You can choose to enroll in the training day during registration for a stand-alone fee of $25. The Training Day will be split into two morning lectures and a hands-on afternoon practice session.

The preliminary program includes:

First morning lecture by Dr. Daniel Duque (9:00 AM - 10:30 AM, EDT)

Dr. Daniel Duque is currently a researcher in the CEHINAV group at Universidad Politécnica de Madrid (UPM). In 1999, he has obtained a PhD in Physics at Universidad Autónoma de Madrid (UAM), with a dissertation on statistical mechanics of surfactants. He has then been awarded a postdoctoral position at University of Washington (1999-2002) and Simon Fraser University (2003), conducting research on statistical mechanics of polymers. Between 2003-2006, Dr. Duque has received a research contract at Institut de Ciència de Materials de Barcelona (ICMAB), focusing on research in molecular dynamics and Monte Carlo simulations. Subsequently, he has returned to UAM between 2006 and 2009 to carry out research in computational geometry applied to simulations. Since 2009, he has been a professor at UPM, working primarily in CFD.

The lecture will aim at introducing the fundamentals of SPH, together with some practical aspects.

The concept of "particles" in computational hydrodynamics
Ideas behind particle methods
Basics of the SPH method: smoothing and discretization
SPH formulations: weakly-compressible and incompressible approaches
Dealing with boundary conditions in SPH
Stabilization: diffusive terms, Riemann solvers

Break (10:30 AM - 11:00 AM, EDT)

Second morning lecture by Dr. Xiangyu Hu (11:00 AM - 12:30 PM, EDT)

Dr. Xiangyu Hu obtained his PhD degree from Beijing Institute of Technology in 1999. After a period of post-doctoral research in Beijing, Singapore, and Dresden, Germany, he joined the Technical University of Munich as a scientific assistant in 2006. He is currently serving the Institute of Aerodynamics and Fluid Mechanics as an Adjunct Teaching Professor. He is also serving in the international SPHERIC steering committee since 2008. Dr. Hu has been engaged in research on computational fluid dynamics. His main research fields are multi-resolution and multi-scale modeling of multiphase flow, smoothed particle hydrodynamics, high-order numerical schemes and others. He has authored or co-authored more than 80 papers in scientific journals and more than 100 presentations in international conferences. He has given more than 20 invited talks in research institutes and universities.

The lecture will focus on numerical modeling of FSI (fluid-structure interaction) problems in a uniform SPH framework. It combines a conventional updated Lagrangian SPH scheme advancing fluid motions with a total Lagrangian SPH formulation dealing with the structure deformations. Since both fluid and solid governing equations are solved in SPH framework, coupling becomes straightforward and meanwhile the momentum of an FSI system is strictly conservative. I will also present a multi-resolution smoothed particle hydrodynamics method for modeling fluid-structure interaction problems. By introducing different smoothing lengths and time steps, the spatio-temporal discretization is applied with different resolutions for fluid and structure. To ensure momentum conservation at the fluid-structure coupling, a position-based Verlet time integration scheme is introduced. Furthermore, the time-averaged velocity and acceleration of solid particles are introduced to enhance force matching in the fluid and solid equations. A set of numerical examples including several bio-mechanical problems are considered to demonstrate the efficiency, accuracy and robustness of the present method. A open-source code for all the examples will also be provided.

Break (12:30 PM - 1:30 PM, EDT)

Practical session with the open-source code DualSPHysics (1:30 PM - 4:00 PM, EDT)

The afternoon will be devoted to hands-on practices in setup and execution of SPH models, and visualization of output data. Topics will be demonstrated through the open-source solver DualSPHysics. Examples will include wave generation, floating objects, inlet & outlet conditions and coupling with the Project Chrono library. This session will be led by the DualSPHysics developers Prof. Benedict Rogers, Dr Georgios Fourtakas, Dr Renato Vacondio, Dr Corrado Altomare, Dr José Domínguez and Dr Alejandro Crespo. They will be available throughout the session to support participants one-on-one and share their knowledge.