Showing papers in "Computers & Fluids in 2018"

TL;DR: In this article, a stabilised and reduced Galerkin projection of the incompressible unsteady Navier-Stokes equations for moderate Reynolds number is presented, based on a finite volumes approximation.

TL;DR: In this paper, the authors investigated the effects of the Rayleigh number, exponential function index, aspect ratio, and Hartmann number on the flow and temperature fields of a power-law, non-Newtonian fluid under an applied magnetic field inside a C-shaped cavity.

TL;DR: An optimization framework that consists of an efficient discrete adjoint implementation for computing derivatives and a Python interface to multiple numerical optimization packages is developed and validated, demonstrating that the developed techniques have the potential to be a useful tool in a wide range of engineering design applications.

TL;DR: In this paper, the authors presented a smoothed particle hydrodynamics (SPH) model for thermo-capillary flow driven by gradients of the surface tension, which is based on the continuum surface force (CSF) approach including Marangoni forces.

TL;DR: In this article, the performance of the discrete velocity method (DVM) and discrete unified gas-kinetic scheme (DUGKS) in finding steady-state solutions of low-speed force-driven Poiseuille and lid-driven cavity flows is investigated.

TL;DR: In this article, the authors compared the computational cost and quality of the solution for direct numerical simulations of Rayleigh-Benard (RB) convection in cubic and cylindrical containers, and found that dedicated special purpose codes for RB convection are more efficient than general purpose codes.

TL;DR: In this paper, the impact of uncertainties in the Windkessel model parameters on the results of numerical simulations of the flow inside ascending thoracic aortic aneurysms is investigated.

TL;DR: In this paper, the results of Large Eddy Simulations (LES) in towed and self-propelled conditions for the DARPA SUBOFF (DSub), a notional submarine geometry at a Reynolds number, based on the model length, L, and the free-stream velocity, U∞, equal to R e L = 1.2 × 10 6.

TL;DR: This work reports on the progress of this work using the simple frigate shape 2 (SFS2), which is a highly simplified ship geometry, to validate the method for low-sea-state cases and built a solid foundation supporting further development of simulation for the CPF in motion.

TL;DR: In this paper, the dispersion and diffusion characteristics of discontinuous spectral element methods (DG) via the spatial eigensolution analysis framework built around a one-dimensional linear problem, namely the linear advection equation, are investigated.

TL;DR: A new simplified BVD (Boundary Variations Diminishing) algorithm, so-called adaptive THINC-BVD, is devised to reduce numerical dissipations through minimizing the total boundary variations for each cell and can become as a practical and promising numerical solver for compressible gas dynamics.

TL;DR: The capability and potential of KARFS to perform DNS of reacting flows with large, detailed reaction mechanisms is demonstrated with various model problems involving ignition and turbulent flame propagations with varying degrees of chemical complexities.

TL;DR: An improved synthetic digital filtering method (SDFM) for the generation of equilibrium turbulence is described, with emphasis on the ease of application to complex configurations as mentioned in this paper, which facilitates the use of modeled (RANS) statistics for the mean flow and Reynolds stress profiles, instead of simulated (DNS or LES) statistics that are not readily available for three-dimensional flows.

TL;DR: In this article, a smooth particle hydrodynamics (SPH) method was proposed to deal with the problems of boundary conditions, dissipation terms or computer arithmetic in long duration sloshing simulations.

TL;DR: An efficient, accurate and robust multiple-relaxation-time (MRT) discrete Boltzmann method (DBM) is proposed for compressible exothermic reactive flows, with both specific heat ratio and Prandtl number being flexible as mentioned in this paper.

TL;DR: In this article, a hybrid lattice Boltzmann method (HLBM) was used to simulate the NACA 0012 airfoil with an unstructured finite-volume formulation.

TL;DR: The implementation of an immersed boundary method (IBM) into a compressible reactive multicomponent Navier-Stokes solver makes use of high-order accuracy discretization schemes applied on structured Cartesian grids.

TL;DR: In this paper, a low-dissipative spatial and time discretisation finite element schemes have been implemented and combined with the Wall-Adapting Local-Eddy viscosity (WALE) subgrid-scale model to solve the filtered incompressible flow equations.

TL;DR: In this article, an axisymmetric bubble dynamics model based on the Eulerian finite element method with the interface tracked by the volume of fluid (VOF) method is established to numerically investigated the breaking and re-closure of a bubble near a free surface.

TL;DR: In this paper, a new OpenFOAM solver QGDFoam is proposed for numerical simulation of viscous compressible flows within a wide range of Mach numbers in the framework of the Open FOAM formalism.

TL;DR: The Lagrangian discontinuous Galerkin (DG) hydrodynamic method for solving the two-dimensional gas dynamic equations on unstructured hybrid meshes is presented in this paper.

TL;DR: In this article, the authors show how to get a relevant weak solution from a pressure-based formulation of the Euler equations of fluid mechanics, which is useful for nonlinear equations of state because it is easier to compute the internal energy from the pressure than the opposite.

TL;DR: In this article, a lattice Boltzmann (LB) based multiscale simulation method has been developed to capture both intravascular nanoparticle (NP) and cell-level transport phenomenon at high efficiency.

TL;DR: It is shown that despite inevitable noise and uncertainties, meaningful flow simulations can be performed using a hybrid classical/quantum hardware approach.

TL;DR: In this paper, the authors compare the D2Q9 lattice scheme with three collision operators: the single relaxation time (BGK), the multiple-relaxation time with raw moments (MRT-RM) and with central moments (CM), and show that the MRT-CM shows favorable properties when compared to the other two schemes.

TL;DR: This work is to develop and disseminate an open source LES tool for low-Mach number turbulent combustion using the OpenFOAM framework, and a collocated-mesh approach suited for unstructured grid formulation is provided.

TL;DR: This paper presents a fast and scalable geometric partitioner based on Space Filling Curves (SFC), as an alternative to the standard graph partitioning approach, and has avoided any computing or memory bottleneck in the algorithm.

TL;DR: In this paper, a conserved discrete unified gas kinetic scheme (DUGKS) is developed for microchannel gas flows in all flow regimes, which has attracted much attention because of its basic research and wide engineering applications in the microelectro-mechanical system (MEMS).

TL;DR: It is proposed here to assess the performances of a fourth-order finite-volume LES solver to perform massively parallel scale-resolving simulations of wind turbines wakes and it is demonstrated that the flow predictions are of equivalent quality on both structured and unstructured grids.

TL;DR: In this paper, a ghost-point immersed boundary method for the compressible Navier-Stokes equations with moving boundaries on fixed Cartesian grids is devised by employing high order summation-by-parts (SBP) difference operators.