Print Email Facebook Twitter Application of a maritime CFD code to a benchmark problem for non-Newtonian fluids: the flow around a sphere Title Application of a maritime CFD code to a benchmark problem for non-Newtonian fluids: the flow around a sphere Author Lovato, S. (TU Delft Rivers, Ports, Waterways and Dredging Engineering) Toxopeus, S.L. (Maritime Research Institute Netherlands (MARIN)) Settels, J.W. (Maritime Research Institute Netherlands (MARIN)) Keetels, G.H. (TU Delft Offshore and Dredging Engineering) Date 2022 Abstract The ship’s resistance and manoeuvrability in shallow waters can be adversely influenced by the presence of fluid mud layers on the seabed of ports and waterways. Fluid mud exhibits a complex non-Newtonian rheology that is often described using the Herschel–Bulkley model. The latter has been recently implemented in a maritime finite-volume CFD code to study the manoeuvrability of ships in the presence of muddy seabeds. In this paper, we explore the accuracy and robustness of the CFD code in simulating the flow of Herschel–Bulkley fluids, including power-law, Bingham and Newtonian fluids as particular cases. As a stepping stone towards the final maritime applications, the study is carried out on a classic benchmark problem in non-Newtonian fluid mechanics: the laminar flow around a sphere. The aim is to test the performance of the non-Newtonian solver before applying it to the more complex scenarios. Present results could also be used as reference data for future testing. Flow simulations are carried out at low Reynolds numbers in order to compare our results with an extensive collection of data from the literature. Results agree both qualitatively and quantitatively with literature. Difficulties in the convergence of the iterative solver emerged when simulating Bingham and Herschel–Bulkley flows. A simple change in the interpolation of the apparent viscosity has mitigated such difficulties. The results of this work, combined with our previous code verification exercises, suggest that the non-Newtonian solver works as intended and it can be thus employed on more complex applications. Subject CFDSpheredrag coefficientregularisationuncertainty estimationvalidation To reference this document use: http://resolver.tudelft.nl/uuid:a8fde3a7-2145-4936-bc38-913d3c300271 DOI https://doi.org/10.3233/ISP-220002 ISSN 0020-868X Source International Shipbuilding Progress, 69 (2), 93-117 Part of collection Institutional Repository Document type journal article Rights © 2022 S. Lovato, S.L. Toxopeus, J.W. Settels, G.H. Keetels Files PDF isp_2022_69_2_isp_69_2_is ... 220002.pdf 1.55 MB Close viewer /islandora/object/uuid:a8fde3a7-2145-4936-bc38-913d3c300271/datastream/OBJ/view