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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)