Lab Home | Phone | Search
Center for Nonlinear Studies  Center for Nonlinear Studies
 Home 
 People 
 CNLS Staff Members 
 Executive Committee 
 Postdocs 
 Visitors 
 Students 
 Research 
 Publications 
 Conferences 
 Workshops 
 Sponsorship 
 Talks 
 Seminars 
 Postdoc Seminars Archive 
 Quantum Lunch 
 Quantum Lunch Archive 
 P/T Colloquia 
 Archive 
 Ulam Scholar 
 Anastasio Fellow 
 
 Student Requests      
 Student Program 
 Visitor Requests 
 Description 
 Past Visitors 
 Services 
 General 
 
 History of CNLS 
 
 Maps, Directions 
 T-Division 
 LANL 
 
Wednesday, August 06, 2025
11:00 AM - 12:00 PM
CNLS Conference Room (TA-3, Bldg 1690)

Seminar

Massively parallel adaptive high-order multi-material hydrodynamics in Quinoa

Aditya Pandare and Facundo Airaudo - CCS-2

High-strain rate multi-material hydrodynamics calculations are crucial to LANL’s mission. These applications require numerical solutions to highly nonlinear elastic-plastic phenomena involving mathematically stiff equations, making it challenging to efficiently obtain accurate solutions. The current state-of-practice introduces excessive errors in regions of high nonlinearities, and employs low-order splitting techniques that further contribute to these errors. As a result, current methods predict unphysical material responses at high strain-rates, thus reducing confidence in numerical simulation. Our aim is to develop a novel numerical method without these flaws, while advancing understanding of high-order hydrodynamic methods. 

In order to do so, we have developed an unsplit high-order framework for multi-material hydrodynamics. The baseline numerical method is a Runge-Kutta Discontinuous Galerkin method. RKDG methods use a direct Runge-Kutta time integrator, resulting in high-order solution accuracy in space and time. Furthermore, our formulation is inherently multi-material (i.e. does not start from a single-material formulation) which allows unique challenges of multi-material methods to be addressed in the underlying design of the method, rather than as a posteriori fixes. These methods are implemented in Quinoa, a massively-parallel hydrocode that is based on the Charm++ task-parallel framework. 

In this seminar, we will briefly talk about three major directions the Quinoa project is currently pursuing: 1) external aerodynamics to assess re-entry body response to blast loading; 2) thermochemical non-equilibrium simulations for hypersonic environment computations; and, 3) hyperelastic solid models for high-strain rate multi-material hydrodynamics.

In pursuing the above directions, the Quinoa project aims at improving the fidelity of LANL's numerical simulation tools, while conducting cutting-edge numerical methods research for multi-material hydrodynamics.

Host: Erin Davis (CCS-2)