We present the extension of an efficient and highly parallelisable framework for incompressible fluid flow simulations to viscoplastic fluids. The system is governed by incompressible conservation of mass, the Cauchy momentum equation, and a generalised Newtonian constitutive law. In order to simulate a wide range of viscoplastic fluids, we employ the Herschel-Bulkley model for yield-stress fluids with nonlinear stress-strain dependency above the yield limit. We utilise Papanastasiou regularisation in our algorithm to deal with the singularity in apparent viscosity. The resulting system of partial differential equations is solved using the IAMR (Incompressible Adaptive Mesh Refinement) code, which uses second-order Godunov methodology for the advective terms and semi-implicit diffusion in the context of an approximate projection method to solve adaptively refined meshes. By augmenting the IAMR code with the ability to simulate regularised Herschel-Bulkley fluids, we obtain efficient numerical software for time-dependent viscoplastic flow in three dimensions, which can be used to investigate systems not considered previously due to computational expense. We validate results from simulations using this new capability against previously published data for Bingham plastics and power-law fluids in the two-dimensional lid-driven cavity. In doing so, we expand the range of Bingham and Reynolds numbers which have been considered in the benchmark tests. Moreover, extensions to time-dependent flow of Herschel-Bulkley fluids and three spatial dimensions offer new insights into the flow of viscoplastic fluids in this test case, and we provide missing benchmark results for these extensions.
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September 2018
Research Article|
September 11 2018
Highly parallelisable simulations of time-dependent viscoplastic fluid flow with structured adaptive mesh refinement
Knut Sverdrup
;
Knut Sverdrup
a)
1
Cavendish Laboratory, University of Cambridge
, Cambridge CB3 0HE, United Kingdom
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Nikolaos Nikiforakis
;
Nikolaos Nikiforakis
1
Cavendish Laboratory, University of Cambridge
, Cambridge CB3 0HE, United Kingdom
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Ann Almgren
Ann Almgren
2
Lawrence Berkeley National Laboratory
, Berkeley, California 94720, USA
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a)
Electronic mail: ksk38@cam.ac.uk
Physics of Fluids 30, 093102 (2018)
Article history
Received:
July 20 2018
Accepted:
August 23 2018
Citation
Knut Sverdrup, Nikolaos Nikiforakis, Ann Almgren; Highly parallelisable simulations of time-dependent viscoplastic fluid flow with structured adaptive mesh refinement. Physics of Fluids 1 September 2018; 30 (9): 093102. https://doi.org/10.1063/1.5049202
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