Computational Investigation of Primary Atomization of an Unsteady and 3D Laminar Liquid Jet, Using LBM and GPU

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Shadkhah, Mehdi | 2021

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 54415 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Taeibi, Mohammad; Kebriaee, Azadeh; Salimi, Mohammad Reza
Abstract:
Based on the history of computational fluid dynamics, choosing a proper method for three-dimensional investigation of two-phase flows is always challenging. In this research, the flow of atomization of a liquid jet was investigated. Also, Using GPU technique made our computations about 40 times faster. The numerical results are in good agreement with available numerical and experimental data. Based on our results, jet flow can achieve different regimes at different Weber and Reynold. Jet flow was found in dripping and Rayleigh instability regimes when Weber number was set to 1.79 and 3.10, respectively. Also, the transition between dripping and jetting was estimated at We between 2 to 3. In the lower Weber numbers, it was observed that the jet breakup length is short and also the size of the drop is relatively large, which increases in higher Weber numbers, where drop become smaller. The forces influencing jet flow breakup are inertial and surface forces at the low Weber numbers. Besides, it was observed that aerodynamic forces do not play a significant role in low Weber numbers and thus can be ignored
Keywords:
Three Dimensional Flow Field ; Lattice Boltzmann Method ; Graphics Procssing Unit (GPU) ; Laminar Jet Flow ; Atomization ; Two Phase Flow

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