Detecting instabilities in the flow of viscoelastic fluids

There is a growing interest in developing numerical </span>tools to investigate the onset of physical instabilities observed in experiments involving viscoelastic flows, which is a difficult and challenging task as the simulations are very sensitive to numerical instabilities. Following a recent linear stability analysis carried out in order to better understand qualitatively the origin of numerical instabilities occurring in the simulation of flows viscoelastic fluids, the present paper considers a possible extension for more complex flows. This promising method could be applied to track instabilities in complex (i.e. essentially non-parallel) flows. In addition, results related to transient growth mechanism indicate that it might be responsible for the development of numerical instabilities in the simulation of viscoelastic fluids.

Published in:
International Journal for Numerical Methods in Fluids, 42, 12, 1345-1361

 Record created 2007-05-22, last modified 2018-03-17

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