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One-way coupling of an advanced CFD multi-physics model to FEA for predicting stress-strain in the solidifying shell during continuous casting of steel
Casting and Flow Simulation Group, Swerea MEFOS.
Casting and Flow Simulation Group, Swerea MEFOS.
Casting and Flow Simulation Group, Swerea MEFOS.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
2015 (English)In: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 84, no 1, article id 12097Article in journal (Refereed) Published
Abstract [en]

One of the main targets for Continuous Casting (CC) modelling is the actual prediction of defects during transient events. However, the majority of CC models are based on a statistical approach towards flow and powder performance, which is unable to capture the subtleties of small variations in casting conditions during real industrial operation or the combined effects of such changes leading eventually to defects. An advanced Computational Fluid Dynamics (CFD) model; which accounts for transient changes on lubrication during casting due to turbulent flow dynamics and mould oscillation has been presented on MCWASP XIV (Austria) to address these issues. The model has been successfully applied to the industrial environment to tackle typical problems such as lack of lubrication or unstable flows. However, a direct application to cracking had proven elusive. The present paper describes how results from this advanced CFD-CC model have been successfully coupled to structural Finite Element Analysis (FEA) for prediction of stress-strains as a function of irregular lubrication conditions in the mould. The main challenge for coupling was the extraction of the solidified shell from CFD calculations (carried out with a hybrid structured mesh) and creating a geometry by using iso-surfaces, re-meshing and mapping loads (e.g. temperature, pressure and external body forces), which served as input to mechanical stress-strain calculations. Preliminary results for CC of slabs show that the temperature distribution within the shell causes shrinkage and thermal deformation; which are in turn, the main source of stress. Results also show reasonable stress levels of 10-20 MPa in regions, where the shell is thin and exposed to large temperature gradients. Finally, predictions are in good agreement with prior works where stresses indicate compression at the slab surface, while tension is observed at the interior; generating a characteristic stress-strain state during solidification in CC

Place, publisher, year, edition, pages
2015. Vol. 84, no 1, article id 12097
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-28678DOI: 10.1088/1757-899X/84/1/012097ISI: 000357879700097Scopus ID: 2-s2.0-84939475987Local ID: 28f00c62-1cdc-4595-8756-36d1628e40ecOAI: oai:DiVA.org:ltu-28678DiVA, id: diva2:1001881
Conference
International Conference on Modeling of Casting, Welding and Advanced Solidification Processes : 21/06/2015 - 26/06/2015
Note

Validerad; 2015; Nivå 1; 20150828 (andbra); Konferensartikel i tidskrift

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-08-16Bibliographically approved

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Cervantes, Michel

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