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2 International Journal of Applied Mechanics and Engineering

2 2002

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Fluid-structured interaction in the case of two independent cylinders in vortex induced vibrations (VIV)

Herfjord K., Olsen G., Kvamsdal T., Okstad K. M.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 1

65-83

A methodology for computing vortex-induced vibrations (VIV) on risers is presented. It is based on computation of the flow by a Computational Fluid Dynamics (CFD) program, structural dynamics by a nonlinear Computational Structural Dynamics (CSD) code and a coupling between them. Herein, we discuss in particular procedures for computing the mesh movement in staggered FSl-simulations. A two-level mesh movement procedure earlier presented for block structured meshes is enhanced for use with completely unstructured meshes. A challenging example involving VIV of two cylinders with large relative motions is presented.

Extrud: a coupled heat and flow solver for 3D simulation of aluminium extrusion

Kvamsdal T., Okstad K. M., Abtahi S.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 1

293-310

In this paper, we investigate the simulation of aluminum extrusion processes by means of a newly developed coupled heat- and flow solver. The extrusion problem is here formulated as two sub-problems which are solved separately in a staggered solution strategy: 1) A non-Newtonian Navier-Stokes flow problem where the viscosity depends both on the effective strain rate and the temperature, and 2) a linear heat conduction problem. The extrusion solver is implemented in C++ based on the Difipack software package (see http: //www.nobjects.com/Diffpack). The results of the numerical simulations are verified against physical experiments conducted by the extrusion laboratory at SINTEF in Trondheim.