The study of Multiphase Fluid Structure Interaction (MFSI) is becoming of great interest in many engineering applications. In this work we propose a new algorithm for coupling a FSI problem to a multiphase interface a...
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The study of Multiphase Fluid Structure Interaction (MFSI) is becoming of great interest in many engineering applications. In this work we propose a new algorithm for coupling a FSI problem to a multiphase interface advection problem. An unstructured computational grid and a Cartesian mesh are used for the FSI and the vof problem, respectively. The coupling between these two different grids is obtained by interpolating the velocity field into the Cartesian grid through a projection operator that can take into account the natural movement of the FSI domain. The piecewise color function is interpolated back on the unstructured grid with a Galerkin interpolation to obtain a point-wise function which allows the direct computation of the surface tension forces. (C) 2017 Elsevier Inc. All rights reserved.
In this paper, a 2D transient numerical model for the simulation of a laser cladding process with a coaxial powder injection is developed. The model is based on the enthalpy method integrated into a liquid/solid volum...
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ISBN:
(纸本)9780791849361
In this paper, a 2D transient numerical model for the simulation of a laser cladding process with a coaxial powder injection is developed. The model is based on the enthalpy method integrated into a liquid/solid volume fraction approach which can simulate the phase change phenomenon. The physical governing equations solved in the model are: the Navier-Stokes equations for fluid flow, and the energy equation including phase change for heat transfer within the powder, clad and substrate. A Volume-of-Fluid (vof) algorithm is used to obtain the solution of the free surface. The model is capable of predicting the clad height, dilution depth and final shape of the clad. The simulations were performed for titanium particles on a titanium substrate. The simulations show that the clad height is decreased with the laser power, the scan speed, and the substrate and particle temperature.
Understanding the stability of fluid interfaces subjected to small vibrations under microgravity conditions is important for designing future materials science experiments to be conducted aboard orbiting spacecraft. D...
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Understanding the stability of fluid interfaces subjected to small vibrations under microgravity conditions is important for designing future materials science experiments to be conducted aboard orbiting spacecraft. During the STS-85 mission, experiments investigating the motion of a large bubble resulting from small, controlled vibrations were performed aboard the Space Shuttle Discovery. To better understand the experimental results, two- and three-dimensional simulations of the experiment were performed using level set and volume-of-fluid interface tracking algorithms. The simulations proved capable of predicting accurately the experimentally determined bubble translation behavior. Linear dependence of the bubble translation amplitude on the container translation amplitude was confirmed. In addition, the simulation model was used to confirm predictions of a theoretical inviscid model of bubble motion developed in a previous study.
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