Abstract
We study the free dendrite growth of a pure substance under the influence of a parallel flow, modulated in time using two different approaches, by means of two-dimensional phase-field simulations. In a previous work amplified side-branching was shown to occur for velocity pulses of appropriate duration (H. Neumann-Heyme et al., IOP Conference Series: Materials Science and Engineering 2012 [1]) which is extended for the case of modulated temperature. To efficiently detect the resonant pulse duration corresponding to the naturally preferred sidebranch frequency we make use of a technique in which the pulse duration is ramped during the growth of the dendrite. Geometrical features of the dendrites grown under the different modulation conditions are discussed.
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