A hybridized discontinuous Galerkin framework for high-order particle–mesh operator splitting of the incompressible Navier–Stokes equations

A hybridized discontinuous Galerkin framework for high-order particle–mesh operator splitting of the incompressible Navier–Stokes equations

Maljaars, J.M. (TU Delft Environmental Fluid Mechanics; TU Delft Rivers, Ports, Waterways and Dredging Engineering)
Labeur, R.J. (TU Delft Environmental Fluid Mechanics)
Möller, M. (TU Delft Numerical Analysis)

2018-04-01

A generic particle–mesh method using a hybridized discontinuous Galerkin (HDG) framework is presented and validated for the solution of the incompressible Navier–Stokes equations. Building upon particle-in-cell concepts, the method is formulated in terms of an operator splitting technique in which Lagrangian particles are used to discretize an advection operator, and an Eulerian mesh-based HDG method is employed for the constitutive modeling to account for the inter-particle interactions. Key to the method is the variational framework provided by the HDG method. This allows to formulate the projections between the Lagrangian particle space and the Eulerian finite element space in terms of local (i.e. cellwise) ℓ²-projections efficiently. Furthermore, exploiting the HDG framework for solving the constitutive equations results in velocity fields which excellently approach the incompressibility constraint in a local sense. By advecting the particles through these velocity fields, the particle distribution remains uniform over time, obviating the need for additional quality control. The presented methodology allows for a straightforward extension to arbitrary-order spatial accuracy on general meshes. A range of numerical examples shows that optimal convergence rates are obtained in space and, given the particular time stepping strategy, second-order accuracy is obtained in time. The model capabilities are further demonstrated by presenting results for the flow over a backward facing step and for the flow around a cylinder.

Finite elements
Hybridized discontinuous Galerkin
Incompressible Navier–Stokes equations
Lagrangian–Eulerian
Material point method
Particle-in-cell

http://resolver.tudelft.nl/uuid:d5cd841b-51f9-4088-9de0-312d066c1902

https://doi.org/10.1016/j.jcp.2017.12.036

2020-01-10

0021-9991

Journal of Computational Physics, 358, 150-172

Institutional Repository

journal article

© 2018 J.M. Maljaars, R.J. Labeur, M. Möller