scholarly journals Introduction to Interface Tracking in Multi-Material Flow Simulations

2018 ◽  
Author(s):  
Rao Veerabhadra Garimella
Keyword(s):  
Material Flow ◽  
Interface Tracking ◽  
Flow Simulations

scholarly journals Marker Re-Distancing (MRD) Algorithm for High-Fidelity Interface Tracking on Arbitrary Meshes

2017 ◽  
Author(s):  
Patrick T. Greene ◽  
Robert Nourgaliev ◽  
Samuel P. Schofield
Keyword(s):  
Material Flow ◽  
High Order ◽  
Interface Tracking ◽  
High Fidelity ◽  
Time Step ◽  
Tracking Method ◽  
Flow Problems ◽  
Constrained Minimization Problem ◽  
Irregular Meshes ◽  
Stability Time

A new sharp high-order interface tracking method for multi-material flow problems on unstructured meshes is presented. This marker re-distancing (MRD) method is designed to work accurately and robustly on unstructured, generally highly distorted meshes, necessitated by applications within ALE-based hydrocodes. The method is a hybrid of a Lagrangian marker tracking method and a novel discontinuous Galerkin (DG) projection based level set re-distancing algorithm. The re-distancing method is formulated as a constrained minimization problem and is shown to obtain arbitrary orders of convergence for smooth interfaces. High-order (>2nd) re-distancing on irregular meshes is a must for applications were the interfacial curvature is important for the underlying physics, such as surface tension, wetting, and detonation shock dynamics. Since no PDE is solved for re-distancing, the method does not have a stability time step restriction, which is particularly useful in combination with AMR, used here to efficiently resolve fine interface features. In addition, the method can robustly handle discontinuities in the distance function without explicit utilization of solution limiters. Results will be shown for a number of different interface geometries, which will demonstrate the method’s capability of obtaining high-fidelity results on arbitrary meshes.

scholarly journals Automated 3D-motion planning for ramps and stairs in intra-logistics material flow simulations

2010 ◽  
Author(s):  
Matthias Fischer ◽  
Hendrik Renken ◽  
Christoph Laroque ◽  
Guido Schaumann ◽  
Wilhelm Dangelmaier
Keyword(s):  
Motion Planning ◽  
Material Flow ◽  
3D Motion ◽  
Flow Simulations

Computational Steering of Interactive Material Flow Simulations

2008 ◽  
Author(s):  
Stefan Lietsch ◽  
Christoph Laroque ◽  
Henning Zabel
Keyword(s):  
Fluid Dynamics ◽  
Molecular Dynamics ◽  
Material Flow ◽  
High Performance ◽  
Flow Simulation ◽  
Computational Steering ◽  
Flow Simulations ◽  
Distributed Simulations ◽  
Computational Fluid Dynamics Cfd ◽  
Performance Computing

In this paper we present the integration of computational steering techniques into the interactive material flow simulation d3FACT insight. This kind of simulation differs from traditional, long running High Performance Computing (HPC) simulations such as Computational Fluid Dynamics (CFD) or Molecular Dynamics in many aspects. One very important aspect is that these simulations run in (soft) real-time, thus the corresponding visualization needs to be updated after every step of the simulation. In turn, this allows to let changes, made through the visualization, impact the actual simulation and again, to see the effects in visualization. To allow this kind of control over the simulation and to further provide a flexible basis to integrate several instances of simulation, visualization and steering components, we used and enhanced a self-developed computational steering platform, which fits best for the needs of highly interactive and distributed simulations. Thereby we are able to realize multi-user and comparative scenarios which were not possible in this field of simulations before.

Bubble flow simulations using the intersection marker (ISM) interface tracking method

2018 ◽  
Vol 28 (1) ◽  
pp. 118-137 ◽  
Author(s):  
Mark Ho ◽  
Guan Heng Yeoh ◽  
John Arthur Reizes ◽  
Victoria Timchenko
Keyword(s):  
Surface Tension ◽  
Two Phase Flow ◽  
Front Tracking ◽  
Interface Tracking ◽  
Phase Flow ◽  
Cfd Simulations ◽  
Two Phase ◽  
Content Type ◽  
Tracking Method ◽  
Flow Simulations

Purpose Interface distinct two-phase computational fluid dynamics (CFD) simulations require accurate tracking in surface curvature, surface area and volume fraction data to precisely calculate effects such as surface tension, interphase momentum and interphase heat and mass transfer exchanges. To attain a higher level of accuracy in two-phase flow CFD simulations, the intersection marker (ISM) method was developed. The ISM method has cell-by-cell remeshing capability that is volume conservative, maintains surface continuity and is suited for the tracking of interface deformation in transient two-phase flow simulations. Studies of isothermal single bubbles rising in quiescent water were carried out to test the ISM method for two-phase flow simulations. Design/methodology/approach The ISM method is a hybrid Lagrangian–Eulerian front tracking algorithm which can model an arbitrary three-dimensional surface within an array of cubic control volumes. Fortran95 was used to implement the ISM method, which resulted in approximately 25,000+ lines of written code and comments. To demonstrate the feasibility of the ISM algorithm for two-phase flow simulations, the ISM algorithm was coupled with an in-house CFD code, which was modified to simulate two-phase flows using a single fluid formulation. The constitutional equations incorporated terms of variable density and viscosity. In addition, body force source terms were included in the momentum equation to account for surface tension and buoyancy effects. Findings The performance of two-phase flow simulations was benchmarked against experimental data for four air/water bubbles with 1, 2.5, 5 and 10 mm of diameter rising in quiescent fluid. A variety of bubble sizes were tested to demonstrate the accuracy of the ISM interface tracking method. The results attained were in close agreement with experimental observations. Practical implications The results obtained show that the ISM method is a viable means for interface tracking of two-phase flow CFD simulations. Other applications of the ISM method include simulations of solid–fluid interaction and other immersed boundary flow problems. Originality/value The ISM method is a novel approach to front tracking, and the results shown are original in content.

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