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Panahi, R. (author), Jahanbakhsh, E. (author), Seif, M.S. (author)In this paper, an integrated computational procedure for simulation of two-phase flow as well as floating and submerged body motions is presented based on a Volume of Fluid (VoF) - fractional step coupling. Two fluids are modeled as a single continuum with a fluid property jump at the interface by solving a scalar transport equation for volume...conference paper 2006
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Engert, M. (author), Nitsche, W. (author)Abstract only.conference paper 2006
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Saremi, M. (author), Taheri, E.E. (author), Dadkhah, M. (author), Ebrahimi, R. (author)In liquid propellant engines, the propellants (fuel and oxidizer) after passing the injectors, are injected to combustion chamber. Generally, in liquid propellant engines, two types of injectors - direct flow and centrifugal flow - are used. The direct flow injector, actuates as an orifice. The input flow to a centrifugal injector, gets the...conference paper 2006
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Shishkin, A. (author), Wagner, C. (author)Large Eddy Simulations (LES) of incompressible turbulent flow around a wind turbine blade at a chord Reynolds number of 5000 are performed using high-order spectral/hp element method (SEM). The method and the early results of the simulations are presented. Some requirements with respect to mesh generation for the SEM concerning h- and p...conference paper 2006
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Arioli, M. (author), Loghin, D. (author)Abstract only.conference paper 2006
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Freitas, R.K. (author), Meinke, M. (author), Schröder, W. (author)In the present work the application of hierarchical grid refinement for the Lattice-Boltzmann Method (LBM) to simulate turbulent flows has been investigated. A transformation and interpolation scheme has been developed based on a volumetric approach, independent of a specific collision model and therefore, generally applicable to all variants of...conference paper 2006
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Kanazaki, M. (author), Tanaka, K. (author), Jeong, S. (author), Yamamoto, K. (author)A multi-objective design exploration for a three-element airfoil consisted of a slat, a main wing, and a flap was carried out. The lift curve improvement is important to design high-lift system, thus design has to be performed with considered multi-angle. The objective functions considered here are to maximize the lift coefficient at landing and...conference paper 2006
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Borzi, A. (author), Wogrin, M. (author)Recent developments on multilevel schemes for open-loop optimal control problems with terminal observation governed by time-dependent reaction-diffusion systems are presented. The solution of optimality systems consisting of reaction-diffusion equations with opposite time orientation is discussed. Of particular importance in applications and for...conference paper 2006
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Jönsthövel, T.B. (author), Oosterlee, C.W. (author), Mulder, W.A. (author)We evaluated multigrid techniques for 3D diffusive electromagnetism. The Maxwell equations and Ohm's law were discretised on stretched grids, with stretching in all coordinate directions. We compared standard multigrid to alternative multigrid approaches with linewise smoothing and semi-coarsening, both as a stand-alone solver and as a...conference paper 2006
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Patel, S. (author), Drikakis, D. (author)Implicit Large Eddy Simulation (ILES) using high-resolution methods have been employed in the investigation of bifurcation and transition of flow through three dimensional suddenly-expanded channels. ILES refers to high-resolution methods employed in spatially under-resolved simulations of turbulent flows without the need to resort to turbulence...conference paper 2006
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Michler, C. (author), Van Brummelen, E.H. (author), In 't Groen, R. (author), De Borst, R. (author)The numerical solution of fluid-structure interactions with the customary subiteration method incurs numerous deficiencies. We validate a recently proposed solution method based on the conjugation of subiteration with a Newton-Krylov method, and demonstrate its superiority and beneficial characteristics.conference paper 2006
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Boldarev, A.. (author), Chetverushkin, B.N. (author), Kartasheva, E.L. (author), Gasilov, V.A. (author), D'yachenko, S.V. (author), Olkhovskaya, O.G. (author)We present a new object-oriented radiative-magnetogasdynamics (RMHD) code based on unstructured grid technology which is expected to be a convenient tool for investigations of plasma dynamics in various pulsed-power facilities. High-performance computing is a proper tool for simulations of complex multiscale nonlinear processes like transient...conference paper 2006
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Rokicki, J. (author), Wieteska, R. (author)The paper discusses finite volume WENO reconstruction applied to simulation of compressible 3D Euler flows using unstructured tetrahedral meshes. The main point of interest is the case when the mesh becomes highly irregular or stretched. Special transformation is used in such cases to recover the third-order accuracy of reconstruction. This...conference paper 2006
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Michielssen, E. (author), Yilmaz, A. (author), Bagci, H. (author), Jin, J. (author)The analysis of transient scattering from perfectly conducting as well as potentially inhomogeneous penetrable bodies often is effected using marching on in time based time domain integral equation methods. This paper reviews the state of the art in the field, highlighting recent advances that address not only their stability and computational...conference paper 2006
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Badia, S. (author), Codina, R. (author)In this paper we suggest some algorithms for the fluid-structure interaction problem stated using a domain decomposition framework. These methods involve stabilized pressure segregation methods for the solution of the fluid problem and fixed point iterative algorithms for the fluid-structure coupling. These coupling algorithms are applied to the...conference paper 2006
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Hoffman, J. (author)In this paper we use a General Galerkin (G2) method to simulate drag crisis for a sphere, where the unresolved turbulent boundary layer is modeled as a decreasing skin friction.conference paper 2006
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Burman, E. (author)In this note we will first discuss finite element discretizations of the incompressible Navier-Stokes equations with some artificial dissipation added in the form of either a turbulence model or some numerical stabilization term. We will then review some results on interior penalty stabilized finite element methods for incompressible flow. These...conference paper 2006
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Borggaard, J. (author), Iliescu, T. (author)The boundary commutation error in large eddy simulation is studied numerically. It is shown that an accurate representation of the boundary commutation error has an important role in a reliable large eddy simulation of wall bounded flows. The numerical experiments in this paper are conducted for a 2D channel flow.conference paper 2006
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Hillewaert, K. (author), Remacle, J.F. (author), Cheveaugeon, N. (author), Bernard, P.E. (author), Geuzaine, P. (author)A hybrid implicit and explicit p-Multigrid iteration strategy for the discretisation of the steady Euler equations with the discontinuous Galerkin finite element method is presented. The implicit strategy consists of an inexact damped Newton iteration, using an ILU(0)-preconditioned GMRES method for the solution of the linear system. Since the...conference paper 2006
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Amirante, D. (author), Luo, K.H. (author)Direct numerical simulations of three-dimensional compressible Navier-Stokes equations are conducted using high-order numerical methods in cylindrical coordinates. Aim of the work is to examine the effect of three-dimensionality in the dynamics of vortex breakdown in swirling jets within a specific range of Reynolds numbers. The main elements of...conference paper 2006