Abstract
Within a flow of a viscous fluid the effects of compression and viscosity are closely coupled with inertia. Discrete mechanics gives a physical sense of these interactions by showing that they exist only in a dynamic vision where the variation of the velocity in time generates the entanglement of the effects of compression and shearing. These two phenomena are described in the form of a Helmholtz–Hodge decomposition by two orthogonal terms within the discrete equation of motion, the first curl-free and the second divergence-free. They can only exchange mechanical energy if the acceleration is nonzero. This entanglement, which occurs at all spatial scales, is a function of longitudinal and transverse celerities. After a presentation of the formal framework, simple examples allow to understand the temporal shifts of direct and induced flows in accordance with the causality principle.
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Caltagirone, JP., Marchioli, C. & Vincent, S. Conservation of acceleration and dynamic entanglement in mechanics. Acta Mech 234, 5511–5541 (2023). https://doi.org/10.1007/s00707-023-03682-4
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DOI: https://doi.org/10.1007/s00707-023-03682-4