MSThE47
Numerical methods for compressible multiphase flows  Part VI of VI
For Part I, see MSMoD08
For Part II, see MSMoE08
For Part III, see MSWeE47
For Part IV, see MSThBC47
For Part V, see MSThD47
Date: August 13
Time: 16:0018:00
Room: 108
(Note: Click title to show the abstract.)
Organizer:
Deng, Xiaolong (Beijing Computational Sci. Research Center)
Wei, Suhua (Inst. of Applied Physics & Computational Mathematics)
Tian, Baolin (Insitute of Applied Physics & Computational Mathematics)
Tiegang, Liu (Beihang Univ.)
Sussman, Mark (Florida State Univ.)
Wang, Shuanghu (IAPCM)
Abstract: Compressible multiphase flows appear in many natural phenomena, and are very important in many applications, including space science, aerospace engineering, energy, homeland security, etc. Numerical calculation is a key for understanding many related problems. More and more numerical methods are being developed and improved. In this minisymposium, novel numerical methods will be presented to show the progress in the area of compressible multiphase flows, including interface capturing/tracking methods, phase change calculations, mixing methods, fluidstructure interaction methods, multiphysics calculations, adaptive mesh refinement, and high performance computing.
MSThE471
16:0016:30
Modified Ghost Fluid Method Applied to Treat Compressible and Incompressible Flow Coupling
Tiegang, Liu (Beihang Univ.)
Abstract: This work is devoted to extending the modified ghost fluid method (MGFM) to treat compressible and incompressible fluid coupling. By solving shock relationship in the compressible medium and a derived equation of interfacial pressure continuity together to predict the ghost fluid states, this approach not only ensures numerical stability and maintains the advantages of simplicity and high efficiency, but also provides a more accurate interface boundary condition. Specific applications to underwater bubble collapse are are presented.
MSThE472
16:3017:00
Computations of lowspeed Multiequation Models
Niu, YangYao (Tamkang Univ.)
Abstract: Computations for modeling lowspeed compressible phenomena in multifluid flows are performed. Timemarching preconditioned methodology is used as the algorithmic framework because of its inherent capability of handling multiple flow regimes, such as the incompressible bulk liquid flow, low Mach number compressible liquid and vapor phase mixture flows. Computational results representative of water faucet, air¨Cwater shock tube, bubbly flow problems based on with the mixture and 4equation twofluid models are presented.
CPThE473
17:0017:20
The Interaction Between Toroidal Swimmers in Stokes Flow
Huang, Jianjun (Worcester Polytechnic Inst.)
Abstract: Here we analyze the fluid dynamic interaction of toroidal swimmers using the method of regularized Stokeslets. We interpret these as threedimensional, zero Reynolds number analogs of finite vortex dipoles in an ideal fluid. We then examine the stability of relative equilibria that can form for these swimmers when they are initially placed in tandem or abreast.
CPThE474
17:2017:40
Almost complete separation of a fluid component from mixture using the Burgers' networks of microseparators
Watanabe, Shinya (Ibaraki Univ.)
Matsumoto, Sohei (National Inst. of Advanced Industrial Sci. & Tech.)
Ono, Naoki (Shibaura Inst. of Tech.)
Abstract: Two types of networks consisting of microseparators are proposed which can separate the target component from fluid mixture almost completely.
Each separator outputs into two outlets mixtures with slightly higher and lower concentrations, respectively.
The outlet concentration difference is modelled by a quadratic map
of the inlet concentration.
Pressure and flow rate distributions in the network are analyzed, then concentration distribution is governed by systems of coupled quadratic maps.
In the continuum the systems become the Burgers equation or its variablecoefficient variant, with noflux boundary conditions.
For one network the initial and boundary value problem is exactly solvable via ColeHopf transformation.
It is proved that the target component becomes concentrated on one side of a transition layer corresponding to a stationary shock regardless of initial concentration distribution.
Another network behaves similarly.
MEMS circuits based on the idea are constructed to separate almost pure hydrogen from mixture using thermal diffusion.
CPThE475
17:4018:00
Thermodynamically consistent modelling and computations for twophase flows
Guo, Zhenlin (Univ. of California Irvine)
Abstract: We present a novel phasefield model to study the twophase flows with thermocapillary effects which allows for the different properties (densities, viscosities and heat conductivities) of each component. The model equations are derived under the thermodynamic framework and the compatibility with the laws of thermodynamics is achieved for the first time. In addition, important modelling properties Onsager reciprocal relations and Galilean invariance have been verified as well. To investigate this model numerically, we provide for the first time, an energy law preserving continuous finite element scheme. To implement the numerical methods more efficiently, we design an adaptive mesh that can automatically adjust to resolve the relevant scales of the phasefield model, ensuring accuracy while minimizing computational cost. Some numerical examples are computed using a continuous finite element method, where the results are compared to the corresponding analytical solutions as validations for our model.
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Footnote: Code: TypeDateTimeRoom No.
Type : IL=Invited Lecture, SL=Special Lectures, MS=Minisymposia, IM=Industrial Minisymposia, CP=Contributed Papers, PP=Posters
Date: Mo=Monday, Tu=Tuesday, We=Wednesday, Th=Thursday, Fr=Friday
Time : A=8:309:30, B=10:0011:00, C=11:1012:10, BC=10:0012:10, D=13:3015:30, E=16:0018:00, F=19:0020:00, G=12:1013:30, H=15:3016:00
Room No.: TBA
