Abstract
A smoothed particle hydrodynamics approach is utilized to model a non-Newtonian fluid with a spatially varying viscosity. In the limit of constant viscosity, this approach recovers an earlier model for Newtonian fluids of Español and Revenga (Phys Rev E 67:026705, 2003). Results are compared with numerical solutions of the general Navier–Strokes equation using the “regularized” Bingham model of Papanastasiou (J Rheol 31:385–404, 1987) that has a shear-rate-dependent viscosity. As an application of this model, the effect of having a non-Newtonian fluid matrix, with a shear-rate-dependent viscosity in a moderately dense suspension, is examined. Simulation results are then compared with experiments on mono-size silica spheres in a shear-thinning fluid and for sand in a calcium carbonate paste. Excellent agreement is found between simulation and experiment. These results indicate that measurements of the shear viscosity of simple shear-rate-dependent non-Newtonian fluids may be used in simulation to predict the viscosity of concentrated suspensions having the same matrix fluid.
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Notes
This earlier paper provides an alternate SPH-based construction of the general Navier–Stokes equations by utilizing the representation of gradients, as found in Eq. 1. As a result, obtaining second order derivatives requires repeated application of Eq. 1. The formulation of the general Navier–Stokes equations in the current paper avoids the direct construction of many of the second-order derivatives through the use of Eq. 9.
Certain commercial equipment, instruments, or materials are identified in this paper in order to specify the experimental procedure adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the materials or equipment identified are necessarily the best available for the purpose.
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Acknowledgements
We would like to gratefully acknowledge support from the Virtual Cement and Concrete testing Laboratory Consortium (VCCTL). The flow simulations were performed under award SMD-05-A-0129, “Modeling the Rheological Properties of Suspensions: Applications to Cement Based Materials” for NASA’s National Leadership Computing System Initiative on the “Columbia” supercomputer at the NASA Ames Research Center. This research also used resources of the Argonne Leadership Computing Facility at Argonne National Laboratory, which is supported by the Office of Science of the US Department of Energy under contract DE-AC02-06CH11357.
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Appendix
Appendix
Proper construction of the weight function W(r) is important for the physically correct transmission of matter or forces between neighboring SPH particles. Here some key properties of W(r) and its derivative are given for convenience. The weight function and alternate formulations are discussed more fully in Español and Revenga (2003), Monaghan (2005).
In this work, the SPH Lucy function is utilized for a weight function.
and
For for the remainder of this paper, we set h = 1. Some of the more important properties of F(r) are given below.
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Martys, N.S., George, W.L., Chun, BW. et al. A smoothed particle hydrodynamics-based fluid model with a spatially dependent viscosity: application to flow of a suspension with a non-Newtonian fluid matrix. Rheol Acta 49, 1059–1069 (2010). https://doi.org/10.1007/s00397-010-0480-7
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DOI: https://doi.org/10.1007/s00397-010-0480-7