Showing papers in "Computers & Fluids in 2007"

TL;DR: Weakly enforced Dirichlet boundary conditions are compared with strongly enforced conditions for boundary layer solutions of the advection-diffusion equation and incompressible Navier-Stokes equations as discussed by the authors.

TL;DR: In this article, the problem of surface ships free to pitch and heave in regular head waves is analyzed numerically with an unsteady Reynolds averaged Navier Stokes (URANS) approach.

TL;DR: Mesh deformation using radial basis functions for gradient-based aerodynamic shape optimization using radialBased aerodynamic Shape Optimization for Mesh deformation

TL;DR: In this article, a new immersed boundary (IB) technique for the simulation of flow interacting with solid boundary is presented, which employs a mixture of Eulerian and Lagrangian variables.

TL;DR: In this article, an interface capturing method based on a numerically revisited procedure for velocity and pressure coupling is worked out and applied to free-surface flows, including the two-dimensional Rayleigh-Taylor instability problem and three-dimensional hydrodynamic flows for the prediction of ship waves around the Series 60 model ship with and without drift angles.

TL;DR: An overview of the finite element methods developed for fluid dynamics problems focuses on stabilized formulations and moving boundaries and interfaces and describes some of the additional methods and ideas introduced to increase the scope and accuracy of these two classes of techniques.

TL;DR: Computational fluid–structure interaction analyses are carried out to investigate the influence of the arterial-wall deformation on the hemodynamic factors, including the wall shear stress distribution, and show various patterns of this influence, depending very much on the arterIAL geometry.

TL;DR: A new so-called partitioned implicit free surface approach is introduced and embedded into a strong coupling FSI solver that shows the same stability properties as a full implicit approach but is by far more efficient—especially in the partitioned coupled case.

TL;DR: In this article, a two-dimensional computer model is developed to simulate free surface flow interaction with a moving body, based on the cut-cell technique in a fixed-grid system.

TL;DR: In this paper, a continuous adjoint formulation for inverse design problems in external aerodynamics and turbomachinery is presented, where the objective function is either a boundary integral (pressure deviation along the solid walls) or a field integral (the entropy generation over the flow domain).

TL;DR: In this paper, a surrogate model based shape optimization method is presented and applied to the case of the multidisciplinary shape optimization of a 2D NACA subsonic airfoil.

TL;DR: This paper presents the latest developments of a discontinuous Galerkin (DG) method for incompressible flows introduced in [Bassi F, Crivellini A, Di Pietro DA, Rebay S] to the coupled Navier–Stokes and energy equations governing natural convection flows and a review of the method together with two recently developed issues.

TL;DR: In this article, a numerical simulation to analyze the influence of the surrounding water in a turbine runner has been carried out using finite element method (FEM), and the added mass effect due to the fluid structure interaction has been discussed in detail.

TL;DR: An adaptive mesh rezoning technique for structured and unstructured meshes is developed that allows kinematically complex problems to be handled effectively and is very attractive from practical problem solving viewpoint.

TL;DR: In this paper, the authors developed a thermodynamic model that can be used for numerical simulations of mixtures of fluids, whereby some of the mixture components cannot be accurately modeled by a thermally perfect equation of state.

TL;DR: In this article, the filament-in-soap film problem is simulated by a fluid-structure interaction finite element method as a two-dimensional version of a flag-inwind problem, where Navier-Stokes equations based on the arbitrary Lagrangian-Eulerian (ALE) method are strongly coupled with the Lagrangians equilibrium equations of the structure.

TL;DR: The Particle Finite Element Method (PFEM) is a well established numerical method as mentioned in this paper, where critical parts of the continuum are discretized into particles and the nodes treated as particles transport their momentum and physical properties in a Lagrangian way while the rest of the nodes may move in an Arbitrary Lagrangians-Eulerian (ALE) frame.

TL;DR: Di Mascio et al. as mentioned in this paper applied the single-phase level set approach to the numerical simulations of three-dimensional free surface flows around complex geometries, at both non-breaking and breaking regimes.

TL;DR: The new shock-capturing parameters introduced recently for the Streamline-Upwind/Petrov–Galerkin (SUPG) formulation of compressible flows based on conservation variables yield better shock quality in the test computations, with more substantial improvements seen for triangular elements.

TL;DR: The discontinuity-capturing directional dissipation (DCDD) was first introduced as a complement to the SUPG and PSPG stabilizations for the computation of incompressible flows in the presence of sharp solution gradients as discussed by the authors.

TL;DR: In this paper, a new conservative discrete ordinate method for nonlinear model kinetic equations is proposed, which ensures the correct approximation of the heat fluxes by satisfying at the discrete level approximation conditions used in deriving the model collision integrals.

TL;DR: A SPIKE scheme with multi-level parallelism is also introduced for solving large banded systems that are sparse within the band, and comparison with the corresponding algorithms of ScaLAPACK are provided.

TL;DR: In this paper, an explicit/implicit finite element method with second order accuracy both in time and space is used for flow field discretization for sound prediction in three different classes of problems: far-field sound generated from flow around a bluff body, sound resulting from blade-stator interaction of turbomachinery and sound due to a turbulent boundary layer on an aerofoil.

TL;DR: In this paper, a numerical methodology coupling Navier-Stokes equations and structural modal equations for predicting 3D transonic wing flutter is developed in a dual-time step implicit unfactored Gauss-Seidel iteration with the Roe scheme is employed for the flow solver.

TL;DR: In this article, a lattice Boltzmann equation (TLBE) model for simulation of isothermal micro flows has been proposed, where the diffusion scattering boundary condition (DSBC) derived in the early model is extended to consider temperature jump at wall boundaries.

TL;DR: Numerical computations of a more complex problem, a vortex-airfoil interaction, show that high-order methods are necessary to capture the significant flow features for transient problems and realistic grid resolutions.

TL;DR: In this paper, a numerical strategy for the simulation of rotary positive displacement pumps is presented, taking as an example a gear pump, where the two gears of the pump are rotating, the intersection between them changes in time.

TL;DR: This paper describes an efficient linearity and bound preserving method for polyhedral meshes based on reconstruction, approximate integration and conservative redistribution, which is validated with a suite of numerical examples.

TL;DR: In this paper, two strategies for numerical resolution of a two-fluid model have been investigated: the Roe4 and Roe5 schemes converge to the same solution when instantaneous pressure relaxation is employed in the Roe5 scheme.

TL;DR: This article provides an overview of the special methods and enhanced solution techniques the authors developed in conjunction with the methods described in the accompanying paper, and introduces the methods and ideas introduced to increase the scope and accuracy of the stabilized formulations and interface-tracking and interfaces-capturing techniques.