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RISS 인기검색어
- 검색키워드
- 주제어 : Ghost fluid method (검색결과 7 건)
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Interface tracking simulation of bubbles in clean and contaminated systems
Kosuke Hayashi,Akio Tomiyama 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
An interface tracking method based on a level set method for simulating bubbles in clean and contaminated systems is presented. Effects of the numerical treatment of the viscous and surface tension forces on predicted interface motion are investigated. A ghost fluid method is the best for both systems. The harmonic mean of the viscosity for the smeared-out interface method gives good evaluations of viscous stress at the interface. However this method causes large errors if the Marangoni force acts on the interface. The arithmetic mean gives some errors, which can be reduced by increasing the spatial resolution. Numerical simulations of nearly spherical bubbles and a deforming bubble are also carried out. These simulations show that the interface tracking method gives accurate predictions of bubble motion and is of great use in investigation of effects of surfactant on bubble motion. Effects of surfactant on the terminal velocity of a Taylor bubble in low Morton number systems are therefore investigated using the interface tracking method. The numerical results confirm that the reduction of surface tension near the bubble nose is the cause of the increase in terminal velocity of a Taylor bubble at low Eotvos numbers.
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Jinwon Park 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
This paper aims to assess the applicability of the Runge Kutta Discontinuous Galerkin-Direct Ghost Fluid Method to the internal explosion inside a water-filled tube, which previously was studied by many researchers in separate works. Once the explosive charge located at the inner center of the water-filled tube explodes, the tube wall is subjected to an extremely high intensity fluid loading and deformed. The deformation causes a modification of the field of fluid flow in the region near the water-structure interface so that has substantial influence on the response of the structure. To connect the structure and the fluid, valid data exchanges along the interface are essential. Classical fluid structure interaction simulations usually employ a matched meshing scheme which discretizes the fluid and structure domains using a single mesh density. The computational cost of fluid structure interaction simulations is usually governed by the structure because the size of time step may be determined by the density of structure mesh. The finer mesh density, the better solution, but more expensive computational cost. To reduce such computational cost, a non-matched meshing scheme which allows for different mesh densities is employed. The coupled numerical approach of this paper has fewer difficulties in the implementation and computation, compared to gas dynamics based approach which requires complicated analytical manipulations. It can also be applied to wider compressible, inviscid fluid flow analyses often found in underwater explosion events.
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Park, Jinwon The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
This paper aims to assess the applicability of the Runge Kutta Discontinuous Galerkin-Direct Ghost Fluid Method to the internal explosion inside a water-filled tube, which previously was studied by many researchers in separate works. Once the explosive charge located at the inner center of the water-filled tube explodes, the tube wall is subjected to an extremely high intensity fluid loading and deformed. The deformation causes a modification of the field of fluid flow in the region near the water-structure interface so that has substantial influence on the response of the structure. To connect the structure and the fluid, valid data exchanges along the interface are essential. Classical fluid structure interaction simulations usually employ a matched meshing scheme which discretizes the fluid and structure domains using a single mesh density. The computational cost of fluid structure interaction simulations is usually governed by the structure because the size of time step may be determined by the density of structure mesh. The finer mesh density, the better solution, but more expensive computational cost. To reduce such computational cost, a non-matched meshing scheme which allows for different mesh densities is employed. The coupled numerical approach of this paper has fewer difficulties in the implementation and computation, compared to gas dynamics based approach which requires complicated analytical manipulations. It can also be applied to wider compressible, inviscid fluid flow analyses often found in underwater explosion events.
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A ghost fluid method for sharp interface simulations of compressible multiphase flows
Sahand Majidi and Asghar Afshari 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
A ghost fluid based computational tool is developed to study a wide range of compressible multiphase flows involving strong shocks and contact discontinuities while accounting for surface tension, viscous stresses and gravitational forces. The solver utilizes constrained reinitialization method to predict the interface configuration at each time step. Surface tension effect is handled via an exact interface Riemann problem solver. Interfacial viscous stresses are approximated by considering continuous velocity and viscous stress across the interface. To assess the performance of the solver several benchmark problems are considered: One-dimensional gas-water shock tube problem, shock-bubble interaction, air cavity collapse in water, underwater explosion, Rayleigh-Taylor Instability, and ellipsoidal drop oscillations. Results obtained from the numerical simulations indicate that the numerical methodology performs reasonably well in predicting flow features and exhibit a very good agreement with prior experimental and numerical observations. To further examine the accuracy of the developed ghost fluid solver, the obtained results are compared to those by a conventional diffuse interface solver. The comparison shows the capability of our ghost fluid method in reproducing the experimentally observed flow characteristics while revealing more details regarding topological changes of the interface.
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Ghost Fluid Method 를 이용한 에너지 물질의 Interface 처리 기법 연구
김기홍(Kim Ki-hong),여재익(Yoh Jai-ick) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
We present an innovative means of numerically treating interfaces associated with chemically active energetic materials. Recent advances in wave tracking technique based on the Ghost Fluid Method (GFM) is extended to handle multi-material multi-phase interfaces associated with chemical environment associated with explosion. We show several work-in-progress applications of our code, including the impact problems involving both energetic and inert elements. Accurate modeling of the equation of state and the constitutive relations are also discussed.
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