標題: A hybrid immersed boundary and immersed interface method for electrohydrodynamic simulations 作者: Hu, Wei-FanLai, Ming-ChihYoung, Yuan-Nan應用數學系數學建模與科學計算所(含中心)Department of Applied MathematicsGraduate Program of Mathematical Modeling and Scientific Computing, Department of Applied Mathematics 關鍵字: Immersed boundary method;Immersed interface method;Elliptic interface problem;Electrohydrodynamics;Leaky dielectric model;Navier-Stokes equations 公開日期: 1-Feb-2015 摘要: In this paper, we develop a hybrid immersed boundary (IB) and immersed interface method (IIM) to simulate the dynamics of a drop under an electric field in Navier-Stokes flows. Within the leaky dielectric framework with piecewise constant electric properties in each fluid, the electric stress can be treated as an interfacial force on the drop interface. Thus, both the electric and capillary forces can be formulated in a unified immersed boundary framework. The electric potential satisfies a Laplace equation which is solved numerically by an augmented immersed interface method which incorporates the jump conditions naturally along the normal direction. The incompressible Navier-Stokes equations for the fluids are solved using a projection method on a staggered MAC grid and the potential is solved at the cell center. The interface is tracked in a Lagrangian manner with mesh control by adding an artificial tangential velocity to transport the Lagrangian markers to ensure that the spacing between markers is uniform throughout the computations. A series of numerical tests for the present scheme have been conducted to illustrate the accuracy and applicability of the method. We first compute the potential and its gradient (electric field) to perform the accuracy check for the present augmented IIM. We then check the convergence of the interfacial electric force and the fluid variables. We further run a series of simulations with different permittivity and conductivity ratios and compare with the results obtained by the small deformation theory and other numerical results in literature. In addition, we also study the electric effect for a drop under shear flow. (C) 2014 Elsevier Inc. All rights reserved. URI: http://dx.doi.org/10.1016/j.jcp.2014.11.005http://hdl.handle.net/11536/124030 ISSN: 0021-9991 DOI: 10.1016/j.jcp.2014.11.005 期刊: JOURNAL OF COMPUTATIONAL PHYSICS Volume: 282 起始頁: 47 結束頁: 61 Appears in Collections: Articles