International Journal for Numerical Methods in Fluids

Cover image for Vol. 75 Issue 12

Early View (Online Version of Record published before inclusion in an issue)

Edited By: Rémi Abgrall, Charbel Farhat

Impact Factor: 1.329

ISI Journal Citation Reports © Ranking: 2013: 19/31 (Physics Fluids & Plasmas); 32/95 (Mathematics Interdisciplinary Applications); 58/102 (Computer Science Interdisciplinary Applications); 63/138 (Mechanics)

Online ISSN: 1097-0363

Associated Title(s): International Journal for Numerical Methods in Biomedical Engineering, International Journal for Numerical Methods in Engineering, International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, Numerical Linear Algebra with Applications

VIEW

  1. 1 - 18
  1. Research Paper Presented at MULTIMAT 2013 Multi-Material Hydrodynamics Simulations

    1. A symmetry preserving dissipative artificial viscosity in r-z geometry

      Pavel Váchal and Burton Wendroff

      Article first published online: 22 JUL 2014 | DOI: 10.1002/fld.3926

      Thumbnail image of graphical abstract

      We present a new artificial viscosity for staggered Lagrangian schemes in 2D-r-z geometry. The suggested viscous force is dissipative by construction, conserves both components of momentum, and preserves spherical symmetry on an equi-angular polar grid. This method turns out to be robust and performs well for spherically symmetric problems on various grid types, with no need for tinkering with problem-dependent or grid-dependent parameters.

  2. Research Articles

    1. An embedded boundary framework for compressible turbulent flow and fluid–structure computations on structured and unstructured grids

      V. Lakshminarayan, C. Farhat and A. Main

      Article first published online: 20 JUL 2014 | DOI: 10.1002/fld.3937

      Thumbnail image of graphical abstract

      The embedded boundary method FIVER for compressible fluid and fluid–structure interaction (FSI) problems is extended to laminar and turbulent viscous flows. Two support algorithms are also presented. The first one focuses on the fast computation of the time-dependent distance to the wall. The second algorithm addresses the robust computation of the flow-induced loads on embedded surfaces. FIVER's potential for turbulent FSI problems is also demonstrated with the simulation of the vertical tail buffeting of an F/A-18 aircraft configuration.

  3. Research Paper Presented at the 8TH Symposium on Numerical Analysis of Fluid Flow and Heat Transfer 2013

    1. Application of a thermodynamically compatible two-phase flow model to the high-resolution simulations of compressible gas–magma flow

      D. Zeidan, R. Touma and A. Slaouti

      Article first published online: 20 JUL 2014 | DOI: 10.1002/fld.3936

      Thumbnail image of graphical abstract

      This study introduces a well-defined mathematical model for the relative velocity investigation of two-phase flows within volcanic processes. The model is used to examine the relative velocity wave propagation and the development of shocks and rarefactions structure within such processes. Well-developed finite volume methods are applied to solve the governing equations. Numerical simulation of non-equilibrium phenomena between phases has been conducted and validated. Results show that the model is beneficial for the study of velocity non-equilibrium of volcanic processes.

  4. Research Articles

    1. Numerical comparison of hybridized discontinuous Galerkin and finite volume methods for incompressible flow

      T. Ahnert and G. Bärwolff

      Article first published online: 20 JUL 2014 | DOI: 10.1002/fld.3938

      Thumbnail image of graphical abstract

      A numerical comparison of a hybridizable discontinuous Galerkin method and a finite volume method is given. The hybridizable discontinuous Galerkin method has been reformulated as Picard iteration and hybridized. The methods are introduced, and four numerical standard simulations are used in order to benchmark and evaluate the solver – the Taylor–Green vortex, the fence case and the 2D DFG benchmark. The benchmarks suggest that hybridized discontinuous Galerkin methods are a viable alternative to finite volume solvers for incompressible fluid simulations.

    2. Numerical simulation of transpiration cooling through porous material

      W. Dahmen, T. Gotzen, S. Müller and M. Rom

      Article first published online: 20 JUL 2014 | DOI: 10.1002/fld.3935

      Thumbnail image of graphical abstract

      Transpiration cooling using ceramic matrix composite materials is an innovative concept for cooling rocket thrust chambers. To investigate the interaction between the cooling gas and the hot gas, the Darcy–Forchheimer equations assuming thermal non-equilibrium and the compressible Reynolds-averaged Navier–Stokes equations are coupled. Suitable coupling conditions are developed and tested by means of two-dimensional and three-dimensional simulations, which are compared with experimental data.

    3. Investigation on a coupled Navier–Stokes–Direct Simulation Monte Carlo method for the simulation of plume flowfield of a conical nozzle

      Zhenyu Tang, Bijiao He and Guobiao Cai

      Article first published online: 20 JUL 2014 | DOI: 10.1002/fld.3924

      Thumbnail image of graphical abstract

      An axisymmetric coupled Navier–Stokes–Direct Simulation Monte Carlo (NS–DSMC) solver, possessing adaptive-interface and two-way coupling features, is investigated for the simulation of nozzle and plume flows of thrusters. The threshold value of KnGL continuum breakdown parameter for nozzle and plume flow problem is studied based on both theoretical kinetic velocity sampling and numerical tests. The coupled NS–DSMC solver is verified by comparing with full DSMC result and experimental data. The coupled method saves more 58.8% CPU time than full DSMC calculation.

  5. RESEARCH PAPER PRESENTED AT THE 8TH SYMPOSIUM ON NUMERICAL ANALYSIS OF FLUID FLOW AND HEAT TRANSFER 2013

    1. A compressible single-temperature conservative two-phase model with phase transitions

      G. La Spina, M. de' Michieli Vitturi and E. Romenski

      Article first published online: 12 JUL 2014 | DOI: 10.1002/fld.3934

      Thumbnail image of graphical abstract

      A model for multidimensional compressible two-phase flow with pressure and velocity relaxations, based on the theory of thermodynamically compatible system (Romenski et al. 2010) is extended to study liquid–gas flows with cavitation. The phase transition is modeled in the balance equation for the mass of one phase through the relaxation of the Gibbs free energies of the two phases. A 1D cavitation tube problem and two 2D numerical simulations regarding cavitation problem are studied: a cavitating Richtmyer–Meshkov instability and a laser-induced cavitation problem.

  6. Research Articles

    1. A method for computing curved meshes via the linear elasticity analogy, application to fluid dynamics problems

      R. Abgrall, C. Dobrzynski and A. Froehly

      Article first published online: 12 JUL 2014 | DOI: 10.1002/fld.3932

      Thumbnail image of graphical abstract

      Starting from an initial straight mesh and using a linear elasticity analogy written on Bezier control points, we provide an algorithm that ‘bends’ the mesh and respects the boundary layer structure. Examples are given in two and three dimensions.

  7. Research Paper Presented at ANADE 2013 Advances in Numerical and Analytical Tools for Detached Flow Prediction

    1. Low cost 3D global instability analysis and flow sensitivity based on dynamic mode decomposition and high-order numerical tools

      Esteban Ferrer, Javier de Vicente and Eusebio Valero

      Article first published online: 8 JUL 2014 | DOI: 10.1002/fld.3930

      Thumbnail image of graphical abstract

      We explore the recently developed snapshot-based dynamic mode decomposition (DMD) technique to predict 3D linear global flow instabilities. We present direct and adjoint modes together with flow sensitivities for 3D complex geometries (i.e. an L-shaped cavity) obtained at a low computational cost using a high-order discontinuous Galerkin solver. We compare these DMD modal structures to DNS simulations and a BiGlobal approach showing very good agreement (as shown in Figure 3).

  8. Research Articles

    1. Application of B-splines and curved geometries to boundaries in SPH

      Daniel J. Barker, Pablo Brito-Parada and Stephen J. Neethling

      Article first published online: 8 JUL 2014 | DOI: 10.1002/fld.3925

      Thumbnail image of graphical abstract

      We present a treatment of reflected ghost particle boundaries for smoothed particle hydrodynamics (SPH), which correctly accounts for the curvature of boundaries. This treatment is shown to improve the accuracy of SPH solutions to flow problems. Also, the use of B-spline curves as boundaries in SPH simulations is presented along with a discussion of the computational issues involved in this. Test cases are investigated and compared with an FEM solution obtained with an established open source code-base.

    2. Numerical simulations of wave interactions with vertical wave barriers using the SPH method

      Xingye Ni, W. B. Feng and Di Wu

      Article first published online: 5 JUL 2014 | DOI: 10.1002/fld.3933

      Thumbnail image of graphical abstract

      This paper proposes a modified dynamic solid boundary treatment for SPH method and validates the new model with water column oscillations in a U-tube. The interactions between regular waves and a 2D simplified vertical wave barrier are simulated with varying relative submerged board lengths, and detailed force analysis is conducted on the structures. A demonstrative test case involving a 3D wave barrier is also provided.

    3. Iteration schemes for rapid post-stall aerodynamic prediction of wings using a decambering approach

      R. C. Paul and A. Gopalarathnam

      Article first published online: 5 JUL 2014 | DOI: 10.1002/fld.3931

      Thumbnail image of graphical abstract

      An iterative approach is presented for rapid post-stall aerodynamic prediction of wings for use in flight simulation and design. This approach uses an analysis method for potential flow calculations and viscous airfoil data as input. A Newton–Raphson iteration is implemented to simultaneously satisfy the boundary condition, from potential flow, and drive the sectional operating points toward their respective input curves, for convergence. Four residual calculation schemes are presented, and results from the best scheme compare favorably against CFD results.

  9. Research Paper Presented at ANADE 2013 Advances in Numerical and Analytical Tools for Detached Flow Prediction

    1. Direct and adjoint global stability analysis of turbulent transonic flows over a NACA0012 profile

      M. C. Iorio, L. M. González and E. Ferrer

      Article first published online: 27 JUN 2014 | DOI: 10.1002/fld.3929

      Thumbnail image of graphical abstract

      In this work, various turbulent solutions of the two-dimensional and three-dimensional compressible Reynolds Averaged Navier–Stokes equations are analyzed using Global Stability theory. This analysis is motivated by the onset of flow unsteadiness for transonic buffet conditions. Results of the corresponding adjoint problem and the sensitivity map are provided. An extruded 3D geometry of the NACA0012 airfoil (see Figure 18) was also analyzed as a Triglobal stability case, confirming that the buffet onset is well detected.

  10. Research Articles

    1. A nodal Godunov method for Lagrangian shock hydrodynamics on unstructured tetrahedral grids

      J. Waltz, N. R. Morgan, T. R. Canfield, M. R. J. Charest and J. G. Wohlbier

      Article first published online: 25 JUN 2014 | DOI: 10.1002/fld.3928

      Thumbnail image of graphical abstract

      We present a nodal Godunov method for Lagrangian shock hydrodynamics. The new method computes reliable solutions on tetrahedral cells for a number of standard test problems. The method also overcomes volume errors that are present in traditional Lagrangian schemes.

  11. Research Paper Presented at MULTIMAT 2013 Multi-Material Hydrodynamics Simulations

    1. On the composite Riemann problem for multi-material fluid flows

      Igor Menshov and Pavel Zakharov

      Article first published online: 24 JUN 2014 | DOI: 10.1002/fld.3927

      Thumbnail image of graphical abstract

      A composite Riemann problem (CRP) describes the decay of an initial discontinuity in the presence of a contact point between two different fluids, which is located off the initial discontinuity point. We discuss the CRP solution and its implementation in the multi-material fluid Godunov method. Numerical results show that a simple framework of the CRP greatly improves capturing material interfaces in the Godunov method and reproduces many of the advantages of more complicated interface tracking multi-material treatments.

  12. Research Articles

    1. A kinetic energy preserving nodal discontinuous Galerkin spectral element method

      Gregor J. Gassner

      Article first published online: 10 JUN 2014 | DOI: 10.1002/fld.3923

      Thumbnail image of graphical abstract

      This figure shows the improved kinetic energy distribution of an nonlinear aeroacoustic problem obtained with a novel kinetic energy consistent nodal discontiniuous Galerkin (DGSEM) discretization (black square symbols) compared to the reference solution (solid line) and other standard DGSEM discretizations. The paper explains the derivation of this novel scheme in detail by starting with Morinishi's skew-symmetric formulation of the Euler equations, mimicking derivations in the continuous case and using the summation-by-parts property of the Gauss–Lobatto DGSEM operators.

    2. On unconditionally positive implicit time integration for the DG scheme applied to shallow water flows

      A. Meister and S. Ortleb

      Article first published online: 4 JUN 2014 | DOI: 10.1002/fld.3921

      Thumbnail image of graphical abstract

      In this work, we present a new unconditionally positivity-preserving implicit time integration method for the DG scheme applied to shallow water flows. The new technique is based on the so-called Patankar trick and guarantees non-negativity of the water height for any time step size while still preserving conservativity. Because of the proposed modification, implicit schemes can now take full advantage of larger time steps and are able to beat explicit time stepping in terms of CPU time.

    3. A dual mortar approach for mesh tying within a variational multiscale method for incompressible flow

      A. Ehrl, A. Popp, V. Gravemeier and W.A. Wall

      Article first published online: 20 MAY 2014 | DOI: 10.1002/fld.3920

      Thumbnail image of graphical abstract

      A dual mortar method for coupling computational subdomains with non-conforming discretizations is proposed in the context of residual-based variational multiscale finite element methods for incompressible fluid flow. Both the integration of the dual mortar approach into an existing variational multiscale finite element framework and the resulting interplay between variational multiscale and coupling terms are investigated. The quality of the proposed method is demonstrated for various three-dimensional numerical flow examples, including a complex patient-specific aneurysm.

VIEW

  1. 1 - 18

SEARCH

SEARCH BY CITATION