Time dependent boundary conditions for hyperbolic systems
Journal of Computational Physics
Numerical computation of internal & external flows: fundamentals of numerical discretization
Numerical computation of internal & external flows: fundamentals of numerical discretization
Time-dependent boundary conditions for hyperbolic systems, II
Journal of Computational Physics
Accurate boundary conditions for multicomponent reactive flows
Journal of Computational Physics
Efficient implementation of weighted ENO schemes
Journal of Computational Physics
Defining wave amplitude in characteristic boundary conditions
Journal of Computational Physics
Journal of Computational Physics
Consistent boundary conditions for multicomponent real gas mixtures based on characteristic waves
Journal of Computational Physics
Journal of Computational Physics
Improved boundary conditions for viscous, reacting, compressible flows
Journal of Computational Physics
Journal of Computational Physics
Journal of Computational Physics
A high-order public domain code for direct numerical simulations of turbulent combustion
Journal of Computational Physics
Journal of Computational Physics
Efficient evaluation of the direct and adjoint linearized dynamics from compressible flow solvers
Journal of Computational Physics
An asynchronous framework for the simulation of the plasma/flow interaction
Journal of Computational Physics
Hi-index | 31.47 |
Navier-Stokes characteristic boundary conditions (NSCBC) usually assume the flow to be normal to the boundary plane. In this paper, NSCBC is extended to account for convection and pressure gradients in boundary planes, resulting in a 3D-NSCBC approach. The introduction of these additional transverse terms requires a specific treatment for the computational domain's edges and corners, as well as a suited set of compatibility conditions for boundaries joining regions associated to different flow properties, as inlet, outlet or wall. A systematic strategy for dealing with edges and corners is derived and compatibility conditions for inlet/outlet and wall/outlet boundaries are proposed. Direct numerical simulation (DNS) tests are carried out on simplified flow configurations at first. 3D-NSCBC brings a drastic reduction of flow distortion and numerical reflection, even in regions of strong transverse convection; the accuracy and convergence rate toward target values of flow quantities is also improved. Then, 3D-NSCBC is used for large-eddy simulation (LES) of a free jet and an impinging round-jet. Edge and corner boundary treatment, combining multidirectional characteristics and compatibility conditions, yields stable and accurate solutions even with mixed boundaries characterized by bad posedness issues (e.g. inlet/outlet). LES confirms the effectiveness of the proposed boundary treatment in reproducing mean flow velocity and turbulent fluctuations up to the computational domain limits.