Filters








12,891 Hits in 3.0 sec

A consistent, scalable model for Eulerian spray modeling

A. Pandal, J.M. Pastor, J.M. García-Oliver, E. Baldwin, D.P. Schmidt
2016 International Journal of Multiphase Flow  
Recently, Eulerian models have shown promise in capturing the fast gas-liquid interactions in the near field.  ...  Despite great practical interest in how sprays emanate from fuel injectors, the near-nozzle region has remained a challenge for spray modelers.  ...  Apart from the projected mass density variable, a tomographic reconstruction of the radiography data for liquid volume fraction (LVF) was made by Pickett et al. [39] .  ... 
doi:10.1016/j.ijmultiphaseflow.2016.04.003 fatcat:7pzxseyfmnfetcnqtvqehbaady

Adaptive solution techniques for simulating underwater explosions and implosions

Samet Y. Kadioglu, Mark Sussman
2008 Journal of Computational Physics  
Results are presented either using a non-conservative semi-implicit algorithm or a conservative semi-implicit algorithm.  ...  Adaptive solution techniques are presented for simulating underwater explosions and implosions.  ...  of the liquid pressure for the bubble growth problem.  ... 
doi:10.1016/j.jcp.2007.10.019 fatcat:itnqpke32bgldnppdzxq53rd6u

A robust implicit–explicit acoustic-transport splitting scheme for two-phase flows

S. Peluchon, G. Gallice, L. Mieussens
2017 Journal of Computational Physics  
Although non-conservative forms are used to derive numerical schemes for the two steps, the overall scheme resulting from this splitting operator strategy is conservative.  ...  For the transport step driven by the slow material waves, an explicit scheme is used.  ...  Table 1 : 1 Comparison of implicit schemes for the acoustic step: Initial data Table 2 : 2 Shock tube test: convergence rate for density, velocity, volume fraction and pressure in L 1 norm.  ... 
doi:10.1016/j.jcp.2017.03.019 fatcat:3z6vacnzrjfdfpbbg5r6sxgzmi

Implicit Large Eddy Simulation of Cavitation in Micro Channel Flows [article]

S Hickel, M. Mihatsch, S.J. Schmidt
2014 arXiv   pre-print
We present a numerical method for Large Eddy Simulations (LES) of compressible two-phase flows. The method is validated for the flow in a micro channel with a step-like restriction.  ...  This setup is representative for typical cavitating multi-phase flows in fuel injectors and follows an experimental study of Iben et al., 2010.  ...  ACKNOWLEDGMENTS We would like to thank Christian Egerer for visualizing the computational results. Simulations were performed at the Leibniz-Rechenzentrum München (LRZ).  ... 
arXiv:1401.6548v1 fatcat:x7kiorjrnjadtmxkwboin3f5aa

Compressible, multiphase semi-implicit method with moment of fluid interface representation

Matthew Jemison, Mark Sussman, Marco Arienti
2014 Journal of Computational Physics  
A unified method for simulating multiphase flows using an exactly mass, momentum, and energy conserving Cell-Integrated Semi-Lagrangian advection algorithm is presented.  ...  The new algorithm uses a semi-implicit pressure update scheme that asymptotically preserves the standard incompressible pressure projection method in the limit of infinite sound speed.  ...  Mass in the liquid and gas regions is conserved to O(10 −12 ).  ... 
doi:10.1016/j.jcp.2014.09.005 fatcat:6eqxpmobpre7lhob4rk74m3y6m

A sharp interface method for incompressible two-phase flows

M. Sussman, K.M. Smith, M.Y. Hussaini, M. Ohta, R. Zhi-Wei
2007 Journal of Computational Physics  
It is stable and robust even for large density and viscosity ratios on the order of 1000 to 1.  ...  It couples the Level-Set and Volume-of-Fluid techniques and retains their advantages while overcoming their weaknesses.  ...  associated with the implicit pressure projection step.  ... 
doi:10.1016/j.jcp.2006.06.020 fatcat:vpyykbdzafgoncixkbjhlvyjvm

A VARIABLE-DENSITY PROJECTION METHOD FOR INTERFACIAL FLOWS

Ming-Jiu Ni, Mohamed Abdou, Satoru Komori
2003 Numerical Heat Transfer, Part B Fundamentals  
General second-order, variable-density, three-step and four-step projection methods are developed to simulate unsteady incompressible interfacial flows.  ...  A high-accuracy, variabledensity RKCN projection method is presented, in which the three-stage, low-storage Runge-Kutta technique and second-order semi-implicit Crank-Nicholson technique are employed to  ...  In the above variable-density RKCN projection method, the Crank-Nicholson implicit technique is employed to update the diffusion term for stability and the lowstorage three-stage Runge-Kutta technique  ... 
doi:10.1080/716100497 fatcat:oskeawpxgnesrgm64spb2nc5da

A semi-implicit conservative sharp-interface method for liquid-solid phase transition

J.W.J. Kaiser, S. Adami, I.S. Akhatov, N.A. Adams
2020 International Journal of Heat and Mass Transfer  
In this work, we develop conservative interface exchange terms for a sharp-interface formulation of liquid-solid phase transition.  ...  Conservation at the interface is maintained by explicit formulation of interface fluxes into both solid and liquid phases.  ...  The authors gratefully acknowledge the Gauss Centre for Supercomputing e.V. ( www.gauss-centre.eu ) for funding this project by providing computing time on the GCS Supercomputer SuperMUC at Leibniz Supercomputing  ... 
doi:10.1016/j.ijheatmasstransfer.2020.119800 fatcat:bgi2x2bsgbbwpf4hbtqys5etzu

Implementation and Comparison of High-Resolution Spatial Discretization Schemes for Solving Two-Fluid Seven-Equation Two-Pressure Model

Pan Wu, Fei Chao, Dan Wu, Jianqiang Shan, Junli Gou
2017 Science and Technology of Nuclear Installations  
In this paper, a semi-implicit algorithm based on the finite volume method with staggered grids is developed to solve such advanced well-posed two-pressure model.  ...  Then the semi-implicit algorithm with high-resolution TVD schemes is validated on the water faucet test.  ...  Nomenclature Symbol : Gas density (kg⋅m −3 ) : Liquid density (kg⋅m −3 ) V : Gas velocity (m⋅s −1 ) V : Liquidvelocity(m⋅s −1 ) : Thecross-sectionalareain the pipeline (m 2 ) Γ : The net gas-liquid mass  ... 
doi:10.1155/2017/4252975 fatcat:hgbcqkmbivg7rfh3bv4pur7bsi

Monolithic Solvers for Incompressible Two-Phase Flows at Large Density and Viscosity Ratios

Mohamed El Ouafa, Stephane Vincent, Vincent Le Chenadec
2021 Fluids  
Here, the unsteady two-phase flow equations are simulated by finite volumes and penalty methods using implicit and monolithic approaches (such as the augmented Lagrangian and the fully coupled methods)  ...  Our target application is the simulation of two-phase flows at high density and viscosity ratios, which are known to be challenging to simulate.  ...  project number A0032B06115.  ... 
doi:10.3390/fluids6010023 fatcat:xwsumudhfndo3nztwn24sfdppy

A parallelized, adaptive algorithm for multiphase flows in general geometries

Mark Sussman
2005 Computers & structures  
We describe a parallelized, adaptive algorithm for multiphase flow in general geometries.  ...  Phase boundaries are considered sharp and their motion is computed using the coupled level set/volume-of-fluid (CLSVOF) method.  ...  For these problems, a semi-implicit pressure solver (e.g. projection method) must be ''robust'' in that it will converge for large density ratios and ''complex'' free surface configurations.  ... 
doi:10.1016/j.compstruc.2004.06.006 fatcat:vybyhbtfifbojprekt3of3xogu

A volume of fluid framework for interface-resolved simulations of vaporizing liquid-gas flows

John Palmore, Olivier Desjardins
2019 Journal of Computational Physics  
This work demonstrates a computational framework for simulating vaporizing, liquid-gas flows.  ...  The framework is built upon a Cartesian grid solver for low-Mach, turbulent flows which has been modified to handle multiphase flows with large density ratios.  ...  A new set of effective densities and viscosities, ρ u and µ u , must be defined using α u , the local fraction of liquid volume in the u velocity cell.  ... 
doi:10.1016/j.jcp.2019.108954 fatcat:ds75hzpfbzhtljoaj7zmpxsffe

An accurate conservative level set/ghost fluid method for simulating turbulent atomization

Olivier Desjardins, Vincent Moureau, Heinz Pitsch
2008 Journal of Computational Physics  
The robustness and efficiency of the approach is further improved by using implicit schemes for the interface transport and re-initialization equations, as well as for the momentum solver.  ...  The conservation errors associated with the accurate conservative level set technique are shown to remain small even for this complex case.  ...  Ed Knudsen for providing the parallel fast marching algorithm used in this work. We are also thankful to Dr. Madhusudan Pai for his fruitful comments on a draft of this manuscript, and to Prof.  ... 
doi:10.1016/j.jcp.2008.05.027 fatcat:wf75rb5shvhuplrhlddubyogfq

Application of the level set method for multi-phase flow computation in fusion engineering

X-Y. Luo, M-J. Ni, A. Ying, M. Abdou
2006 Fusion engineering and design  
Numerical simulation of multi-phase flow is essential to evaluate the feasibility of a liquid protection scheme for the power plant chamber.  ...  This paper presents a general formula for the second-order projection method combined with the level set method to simulate unsteady incompressible multi-phase flow with/out phase change flow encountered  ...  The projection method also has second-order temporal accuracy for variable-density unsteady incompressible flows.  ... 
doi:10.1016/j.fusengdes.2005.09.051 fatcat:6dtvdh75brhedlxfdu653zmhwq

Modeling Acoustic Cavitation Using a Pressure-Based Algorithm for Polytropic Fluids

Fabian Denner, Fabien Evrard, Berend van Wachem
2020 Fluids  
A fully coupled pressure-based algorithm and finite-volume framework for the simulation of the acoustic cavitation of bubbles in polytropic gas-liquid systems is proposed.  ...  for pressure and velocity.  ...  Acknowledgments: We thank Jörg Schulenburg and Daniel Hasemann for their support with the computing systems at Otto-von-Guericke-Universität Magdeburg.  ... 
doi:10.3390/fluids5020069 fatcat:zijgpn5sunaadfcsxvnh7esa4a
« Previous Showing results 1 — 15 out of 12,891 results