A5047375398- Computational Fluid Dynamics and Aerodynamics
- Advanced Numerical Methods in Computational Mathematics
- Lattice Boltzmann Simulation Studies
- Fluid Dynamics and Turbulent Flows
- Fluid Dynamics and Heat Transfer
- Numerical methods for differential equations
- Fluid Dynamics Simulations and Interactions
- Advanced Data Storage Technologies
- Gas Dynamics and Kinetic Theory
- Parallel Computing and Optimization Techniques
- Distributed and Parallel Computing Systems
- Fluid Dynamics and Vibration Analysis
- Aerodynamics and Acoustics in Jet Flows
- Dynamics and Control of Mechanical Systems
- Cyclone Separators and Fluid Dynamics
- Education in Diverse Contexts
- Vibration and Dynamic Analysis
- Computer Graphics and Visualization Techniques
- Model Reduction and Neural Networks
- Plasma and Flow Control in Aerodynamics
- Combustion and Detonation Processes
Los Alamos National Laboratory
2019-2024
Computational Physics (United States)
2020-2023
North Carolina State University
2015-2018
National Chemical Laboratory
2015
Summary Discontinuous Galerkin (DG) methods have been well established for single‐material hydrodynamics. However, consistent DG discretizations non‐equilibrium multi‐material (more than two materials) hydrodynamics not extensively studied. In this work, a novel reconstructed (rDG) method the single‐velocity system is presented. The being considered assumes stiff velocity relaxation, but does assume pressure and temperature equilibrium between multiple materials. A second‐order DG(P 1 )...
We present an open-source code, Xyst, intended for the simulation of complex-geometry 3D compressible flows. The software implementation facilitates effective use largest distributed-memory machines, combining data-, and task-parallelism on top Charm++ runtime system. Charm++’s execution model is asynchronous by default, allowing arbitrary overlap computation communication. Built-in automatic load balancing enables redistribution arbitrarily heterogeneous computational based real-time CPU...
Abstract A novel p ‐adaptive discontinuous Galerkin (DG) method has been developed to solve the Euler equations on three‐dimensional tetrahedral grids. Hierarchical orthogonal basis functions are adopted for DG spatial discretization while a third order TVD Runge‐Kutta is used time integration. vertex‐based limiter applied numerical solution in eliminate oscillations high method. An error indicator constructed from of and adapt degrees freedom each computational element, which remarkably...
A parallel p-adaptive discontinuous Galerkin (DG) method was presented for compressible flows on 3D tetrahedral grids. Hierarchical orthogonal basis functions are adopted to facilitate the p-adaptation. Unlike traditional data parallelism implemented by MPI, our algorithm in a new adaptive CFD code Quinoa* is based combination of task and so that it fit framework Charm++ library. This naturally enables asynchronous communications dynamic load balancing techniques use Charm++. number...
Abstract A high‐order discontinuous Galerkin (DG) method is presented for nonequilibrium multi‐material () flow with sharp interfaces. Material interfaces are reconstructed using the algebraic THINC approach, resulting in a interface resolution. The system assumes stiff velocity relaxation and pressure nonequilibrium. DG uses Dubiner's orthogonal basis functions on tetrahedral elements. This results unique combination of multimaterial accurate solutions smooth single‐material regions. novel...
Discontinuous Galerkin (DG) methods have been well established for single-material compressible and incompressible fluid dynamics. However, DG discretizations non-equilibrium multi-material hydrodynamics not extensively studied. In a recent work, such systems was studied, novel well-balanced discretization pressure flows proposed. This work presents the implementation of method single-velocity system on unstructured 3D meshes. The considered here assumes stiff velocity relaxation, but allows...
View Video Presentation: https://doi.org/10.2514/6.2021-0856.vid A finite volume method with a six-equation multi-fluid single-pressure model is implemented in three-dimensional vertex centered code, FEFLO. The was developed from the stratified flow model. least-squares reconstruction Kuzmins vertex-based (VB) limiter for fraction and set of primitive variables presented method. sharpening technique based on hyperbolic tangent interpolation, i.e., THINC, adopted to sharpen transitioning...
A discontinuous Galerkin method employing the algebraic THINC reconstruction is presented for computation of sharp interface multi (≥ 2) material fluid flow. The DG uses finite volume discretizations fractions, but retains high-order mass, momentum and energy equations. This computationally beneficial multi-material flow, since fraction fields have constant values (0 or 1) away from interfaces, do not require accuracy. used to reconstruct interfaces sharply within 3-4 tetrahedral cells....
View Video Presentation: https://doi.org/10.2514/6.2021-2858.vid A finite volume method with a multi-fluid single velocity and pressure model is implemented in three-dimensional vertex centered code, FEFLO. The considered fluids include air, water high explosive material. ideal equation of state used for air. stiffened gas water. Jones-Wilkins-Lee (JWL) the material to describe detonation process. These equations are written general formulation. quasi-conservative system discretized space...