Abstract
We introduce a mathematical formalism towards the construction of a continuum-field theory for particulate fluids and solids. We briefly outline a research program aimed at unifying the fundamentals of the coarse-graining theory and the numerical method of Smoothed Particle Hydrodynamics (SPH). We show that the coarse-graining functions must satisfy well defined mathematical properties that comply with those of the SPH kernel integral representation of continuous fields. Given the appropriate dynamics for the macroscopic response, the present formalism is able to describe both the solid and fluid-like behaviour of granular materials.
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Notes
- 1.
For granular systems this approach seems doomed from the outset: because energy is lost through internal friction, and gained by a non-thermal source such as tapping or shearing, the dynamical equations do not leave the canonical or any other known ensemble invariant.
- 2.
Remark 1 In general, an \(n\)-rank tensor function \(G:\fancyscript{D}\rightarrow \mathbb {R}^4\otimes ^{[n]}\mathbb {R}^4\) (where \(\otimes ^{[n]}\) denotes the \(n\)-rank tensor product) is not an observable. Nevertheless, each component of the tensor is an observable. Typical examples are the components of the stress tensor (\(\sigma ^{\alpha \beta }\), where Greek indices denote Cartesian coordinates), or the components of the velocity field (\(v^{\alpha }\)).
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Marín, J.F., Petit, J.C., Sigalotti, L.D.G., Trujillo, L. (2014). Integral Representation for Continuous Matter Fields in Granular Dynamics. In: Sigalotti, L., Klapp, J., Sira, E. (eds) Computational and Experimental Fluid Mechanics with Applications to Physics, Engineering and the Environment. Environmental Science and Engineering(). Springer, Cham. https://doi.org/10.1007/978-3-319-00191-3_33
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DOI: https://doi.org/10.1007/978-3-319-00191-3_33
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