Simulation of direct chill casting under the influence of a low-frequency electromagnetic field

Hatić, Vanja; Mavrič, Boštjan; Košnik, Nejc; Šarler, Božidar

doi:10.1016/j.apm.2017.09.034

Cited by 57 publications

(27 citation statements)

References 31 publications

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“…The effect of the described model is best observed for points at the centre line (P1, P4 and P7) and can be also seen on the temperature graph ( Figure 5). Finally, a comparison is made for a uniform and nonuniform node arrangement with randomly positioned nodes [17] and is presented in Figures 2f (uniform) and 8 (non-uniform). Although the final macrosegregation pattern is similar for both of the cases, there are observable differences in the mesosegregates.…”

Section: Resultsmentioning

confidence: 99%

Modelling of macrosegregation with mesosegregates in a binary metallic cast by the diffuse approximate meshless method

et al. 2018

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The solidification of binary metallic alloy (Sn-10%Pb) is simulated in 2D with a diffuse approximate meshless method. The macrosegregation with mesosegregates is described by a coupled set of volume-averaged partial differential equations. The incompressible Newtonian fluid is described by coupled mass and momentum equations and the mushy zone is treated as a Darcy porous media. The energy transport is described with enthalpy formulation and the species transfer is incorporated by considering the Lever rule approximation. The thermo-solutal Boussinesq hypothesis is applied in order to account for the double-diffusive effects in the melt. The mathematical model is solved by a diffusive approximate method on local subdomains with Euler time stepping. Pressure-velocity coupling is incorporated by applying the fractional step method. The instabilities due to the convective terms are smoothed out by applying the upwinding technique. The results are presented on a regular node arrangement and are compared to other benchmark results. The present paper demonstrates that the results calculated with the diffuse approximate meshless method are in good agreement with reference results.

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Section: Resultsmentioning

confidence: 99%

Modelling of macrosegregation with mesosegregates in a binary metallic cast by the diffuse approximate meshless method

et al. 2018

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“…As the coil has a certain taper, the simulated distribution of the magnetic field was not uniform. It can be seen, from Figure 3b, that the electromagnetic field strength of the clamping part was relatively strong from top to bottom and, as a result, the heating effect of the clamping part from top to bottom is very fast and obvious [27]. Then, the classical structure was modified, with a layer of copper strands tightly wound around the bottom layer and a plurality of copper strands tightly wound in the middle of the 2-4 layers.…”

Section: Electromagnetic Field Simulationmentioning

confidence: 99%

A Study on the Heating Method and Implementation of a Shrink-Fit Tool Holder

Sun

et al. 2019

Energies

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A novel induction heating coil is proposed and designed as a shrink-fit tool holder. An electromagnetic field analysis of the coil with different winding methods is conducted using the ANSYS finite element analysis software and an appropriate coil structure is determined, based on the simulated electromagnetic field distribution cloud maps. The magnetic field in the X–Y plane is increased by one order of magnitude around the surface with the addition of the designed magnetic slot, as well as improving the magnetic leakage. The electromagnetic field strength in the middle of the coil is greatly increased, up to 2.312 × 104 A/m, by the addition of a designed magnetic ring covering the top of the coil. The distribution of the three-dimensional temperature field is obtained by the ANSYS workbench transient thermal analysis software, based on the selected coil. Hot-loading equipment used for shrink-fit tool holders are implemented with diameter-selection, power, and heating time-setting functions. Experiments on different types of tool holders are carried out to obtain optimal heating parameters and to verify the reliability of the implemented heating equipment. Through experimental testing, the inserting and pulling out temperature is found to be about 270 °C for the BT40-SF06 and about 285 °C for the BT40-SF10. According to the experimental results, the simulated temperature field is in good agreement with the measured result. The optimal heating parameters of the heating equipment are determined, which proves the correctness of the heating method of the shrink-fit tool holder.

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“…This greatly reduces the amount of effort required to generate the discretisation and thus allows a flexible application of the method to complex geometries. Furthermore, computation on scattered node arrangements, which are in addition adaptive in time and space [4], is also easier than in mesh-based numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a macrosegregation benchmark in a cylindrical coordinate system with a meshless method

Hatić

Fernández

Mavrič

et al. 2019

International Journal of Thermal Sciences

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The main objective of the present paper is to define a new benchmark test for macrosegregation in axisymmetry and to verify a novel meshless method on it. The test case represents a solidification of Al4.5wt%Cu alloy in two different types of geometries, a solid and a hollow cylinder, cooled at the vertical boundaries. The volume averaging method is used to formulate the coupled mass, energy, momentum, and species transport equations for solid-liquid flow. The lever rule is used for determination of liquid and solid fraction. The meshless numerical approach, verified in this paper, is called the diffuse approximate method. The method is formed by using the weighted least squares approximation, where the second-order polynomial basis and Gaussians are used as trial and weight functions, respectively. The method is localised with the use of subdomains, each containing thirteen computational nodes. The explicit Euler scheme is used to perform the temporal integration. The fractional step method is used to couple the pressurevelocity fields. The stability of the method is attained by an adaptive shift of the computational node and Gaussian weight in the upstream direction. Results are presented for three geometrically different simulations. The results are compared with the classical finite volume method. All results show a very good agreement with the finite volume method. The simulations

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Simulation of direct chill casting under the influence of a low-frequency electromagnetic field

Cited by 57 publications

References 31 publications

Modelling of macrosegregation with mesosegregates in a binary metallic cast by the diffuse approximate meshless method

Modelling of macrosegregation with mesosegregates in a binary metallic cast by the diffuse approximate meshless method

A Study on the Heating Method and Implementation of a Shrink-Fit Tool Holder

Simulation of a macrosegregation benchmark in a cylindrical coordinate system with a meshless method

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