Method for simulating laser powder bed melting process by using lattice Boltzmann method based on Python

Abstract

The invention discloses a method for simulating a laser powder bed melting process by using a lattice Boltzmann method on the basis of Python. The whole process of modeling, calculation and data visualization is achieved by completely depending on Python language, Numpy, Mayavi and other extension packages. Different from a traditional CFD method, the method does not need to be based on continuityhypothesis, only operation points need to be regarded as particles capable of being transmitted in a mutual collision mode, efficient solving can be achieved, and the simulation requirement can be highly flexibly customized through Python codes. According to the numerical simulation method, a new thought is provided, the influence of contour scanning on entity scanning and the temperature field and flow field conditions at the laser corner in the printing process are obtained, reference is provided for optimization of technological parameters, and meanwhile the efficient numerical simulationmethod aims to provide a novel solution for analyzing a temperature field and a flow field of a molten pool in the melting process of a single-layer multi-channel laser powder bed.

Description

technical field [0001] The invention belongs to the field of laser powder bed melting, and in particular relates to a numerical simulation method for laser powder bed melting process based on Python and using a lattice Boltzmann method. Background technique [0002] Laser Powder Bed Fusion (LPBF) uses nickel-based alloys, steel, titanium alloys and other high-melting point alloy powders as the main material, uses laser beams to focus micro-spots, and uses the obtained high-energy-density micro-spots to heat and melt the powder to reshape it . The processing process is as follows: the parts to be processed are modeled using CAD software, and then processed by slicing software to reconstruct the three-dimensional model into a two-dimensional thin layer with a certain thickness (usually tens of microns), and different Areas (such as the contour scanning area, the filling area between the contour and the solid scanning area, and the solid scanning area) set different laser powe...

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Problems solved by technology

In recent years, with the development of the lattice Boltzmann method, it has become an important means of fluid simulation research. Its method of solving the N-S equation is different from the traditional finite element method or finite volume method, and it avoids the Laplace algorithm in the solution process. Subcomputation takes up a lot of computing resources, so it has unique advantages in solving N-S equations, but the existing commercial software based on the lattice Boltzmann method is not yet mature, and most of them use C++, Matlab, Fortran for programming

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