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Lattice Boltzmann Simulation of Natural Convection During Dendritic Growth

Hashemi, Mohammad
http://rave.ohiolink.edu/etdc/view?acc_num=akron1459444594

Abstract Details

2016, Master of Science in Engineering, University of Akron, Mechanical Engineering.
A two-dimensional (2D) and a three-dimensional (3D) lattice Boltzmann (LB) and Cellular Automaton (CA) models were developed to study the buoyancy-induced mechanism of micro-segregation defects leading to formation of freckles in solidification of binary alloys. The channel-like defects that form during solidification have a significant influence on mechanical properties of the cast products. 3D simulations can provide a more profound insight about the mechanism of freckle formation, in comparison with the previous two-dimensional simulations. In the present work, lattice Boltzmann method (LBM) is used to solve for transport phenomena, while CA is employed to capture the solidification interface. Considering the local nature of LB and CA methods, combination of the two methods is a decent choice for large-scale parallelization. The model can be used to simulate dendritic growth, micro-segregation and freckle formation during solidification of metallic alloys in large-scale domains. The computer simulation results indicate that an instability in the fluid density leads to a competition among dendrites that retards growth of some dendrites and accelerates the others. The solute-rich channels which survive during this competition will solidify in the form of freckles.
Sergio Felicelli (Advisor)
Mohsen Eshraghi (Committee Member)
67 p.
Materials Science; Mechanical Engineering
Solidification; Micro-segregation; Lattice Boltzmann Method; Cellular Automaton

Recommended Citations

Citations

  • Hashemi, M. (2016). Lattice Boltzmann Simulation of Natural Convection During Dendritic Growth [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459444594

    APA Style (7th edition)

  • Hashemi, Mohammad. Lattice Boltzmann Simulation of Natural Convection During Dendritic Growth. 2016. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1459444594.

    MLA Style (8th edition)

  • Hashemi, Mohammad. "Lattice Boltzmann Simulation of Natural Convection During Dendritic Growth." Master's thesis, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459444594

    Chicago Manual of Style (17th edition)

akron1459444594
746
© 2016, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.