Numerical & physical modelling of fluid flow in a continuous casting mould: Flow dynamics studies for flexible operation of continuous casters
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
The current demands on Swedish steel industry to produce low quantity batches of specialized products requires research on steel casting processes. There are several physical processes that need be taken into account for this problem to be viewed in full light such as thermal-processes, solidiﬁcation and ﬂuid dynamics. This work focuses on the ﬂuid-dynamics part; more speciﬁcally, the dependence of ﬂow quality within the caster on nozzle and mould geometry.
The simulations are carried out using a scale-resolving method, in speciﬁc LES (Large Eddy Simulation) which is coupled with a DPM (Discrete Phase Model) to model Argon behaviour. The results of these simulations are presented and validated against physical experiment and data from industrial trials. Conclusions are drawn regarding optimal nozzle types in respect to diﬀerent mould geometries.
The mould eigenfrequencies are shown to exhibit a connection with the casting velocity. This results in so called sweet spots in casting velocity where ﬂow irregularities due to sloshing is minimal. It is shown that the mountain type nozzle is preferable for smaller geometries whilst comparatively larger geometries beneﬁt from a cup type.
Place, publisher, year, edition, pages
2016. , 125 p.
numerical modelling, physical modelling, fluid flow, continuous casting, casting, mould flow, fluid dynamics, flexible operation of continuous casters, LES, DPM, large eddy simulation
Computational Mathematics Physical Sciences
IdentifiersURN: urn:nbn:se:ltu:diva-59847OAI: oai:DiVA.org:ltu-59847DiVA: diva2:1038732
Subject / course
Student thesis, at least 30 credits
Engineering Physics and Electrical Engineering, master's level
Nazem Jalali, Pooria, Master of Science
Hellström, Gunnar, Assosiate Research Assistant