Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.83: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Numerical investigation of dendritic growth in external flows — •Dmitry Medvedev and Klaus Kassner — Institute of Theoretical Physics, Otto-von-Guericke University Magdeburg, Universitaetsplatz 2, 39106 Magdeburg

A combined phase-field/lattice-Boltzmann scheme is used to simulate dendritic growth from a supercooled melt in external flows with different geometries.

The phase change part of the problem is treated with the phase-field approach of Karma and Rappel, whereas the flow of the liquid is simulated by a standard lattice-Boltzmann-BGK (LBGK) method with interactions with solid and thermal convection incorporated. To simulate conductive and convective heat transfer we use the multicomponent LBE method.

Growth of patterns in a shear flow was simulated for different flow velocities. The results show much stronger influence of the flow on doublons than on dendrites.

The effect of parallel flow on dendritic growth was investigated for different undercooling, flow velocity and viscosity, and channel width. Decrease of the channel width leads to significant changes in the shape and operating parameters of the dendrite.