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Active nematic fluids with flow alignment

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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutor: Jaume Casademunt Viader

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We derive a stream function formulation for the dynamics of 2D active nematics in the absence of topological defects. This formulation extends previous studies by incorporating the ﬂow alignment coupling. We study the linear stability analysis of the spontaneous-ﬂow instability and check it numerically. Then, we obtain numerically the 2D nonlinear stationary states for a particular limit in which active forces dominate over elastic ones, and viscous dissipation dominates over rotational dissipation. Finally, we ﬁnd signiﬁcant diﬀerences with previous results due to the presence of the ﬂow alignment coupling

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Active nematic fluids with flow alignment