Galerkin-truncated dynamics of ideal fluids and superfluids: cascades, thermalization and dissipative effects
نویسنده
چکیده
A phenomenological two-fluid model of the (time-reversible) spectrally-truncated 3D Euler equation is proposed. The thermalized small scales are first shown to be quasi-normal. The effective viscosity and thermal diffusion are then determined, using EDQNM closure and Monte-Carlo numerical computations. Finally, the model is validated by comparing its dynamics with that of the original truncated Euler equation. c © 2007 Elsevier B.V. All rights reserved. PACS: 47.27.eb; 47.27.em; 47.15.ki
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