Kenta Mitsufuji

Validation of Meshless Method Based on Weighted Least Square Method for Simulating Electromagnetic Levitation

Electromagnetic levitation is a kind of magnetohydrodynamic phenomena, which is used for measuring the thermophysical properties of pure metals under high temperature. However, this phenomenon is complicated, and detailed mechanisms have not been clarified yet. This paper proposes the meshless method based on weighted least square method for the analysis of electromagnetic levitation. In this method, the fluid motion equation and the magnetic field equation are weakly coupled. The effectiveness of this method is verified through the analysis of the molten metal behavior.

Numerical Analysis of Electromagnetic Levitation Employing Meshless Method Based on Weighted Least Square Method

Abstract Electromagnetic levitation is a kind of magnetohydrodynamic phenomena which is useful to measure the thermo-physical properties of pure metals under high temperature. However, this phenomenon is complicated and detailed mechanisms of this phenomenon have not been clarified yet. This study proposes the meshless method based on weighted least square method for the analysis of electromagnetic levitation. In this study, the fluid motion equation and the magnetic field equation are coupled by this method. The behavior of a molten metal under high-frequency magnetic field is calculated by this method.

Numerical Analysis of FSW Employing Discrete Element Method

The Friction Stir Welding (FSW) is known as the non-melting joining technique. The numerical analysis methods employing grid methods for FSW process have been developed. However, the FSW includes the complex phenomena as plastic flow of the substances, temperature flow and a phase transformation. Some complex processes are required to analyze the substances of different physical properties on the bonded interface and the dissimilar joining. This paper proposes the analysis technique for the FSW employing the Discrete Element Method (DEM). The DEM is the analysis technique for that analyze the powders behavior. In this report, a proposal analysis model of plasticity body for FSW simulation is described. Finally, the usefulness is discussed through the analysis result of FSW process.

A ferrofluid motion analysis with particle method and magnetic moment method

A ferrofluid under a magnetic field shows complex behavior. In this paper, a coupled analysis method is proposed employing the particle method and the magnetic moment method. The effectiveness of this method is verified when it is applied to the ferrofluid motion analysis.

Development of FSW Simulation Model-Effect of Tool Shape on Plastic Flow

The friction stir welding (FSW) is known as non-melting joining. Numerical analysis methods for FSW also have been developed. In these models, general grid methods have traditionally been used. However, there are some problems when these methods are employed. Calculation of the advection term for both momentum and temperature needs technical attention. To analyze a few substances of different physical properties such as the phase transformation on the bonded interface or the dissimilar joining, some complex process is required. In this study, these problems are avoided by adopting particle methods for FSW simulation. Lagrange approach is mainly used, so this particle methods calculate mass transfer and surface deformation more easily than general grid methods. The effectiveness of this method is verified by plastic flow around the tool examined by particle trace. As a result, phase transformation and tool’s shape change are taken into account for the analysis of the material flow around the tool.