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Showing 1 to 20 of 27 for “"Adaptive Mesh Refinement (AMR)"”.
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Exploring a Novel Adaptive Mesh Refinement Strategy for High-Speed CFD
<p>Adaptive Mesh Refinement (AMR) techniques to efficiently and robustly achieve grid independent solutions on multi-element unstructured grids is a topic of practical interest within the CFD community.</p> <p>The current effort focuses on the efficiency of a novel Adaptive Mesh Refinement (AMR) …
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Autonomous hierarchical adaptive mesh refinement for multiscale simulations
… solutions do not require such high resolutions. Adaptive mesh refinement (AMR) addresses this problem by providing a means to perform high-resolution computation only in areas that require it. In the AMR strategy discussed, a nested hierarchy of overlaying grids of increasingly fine …
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A Parallel Solution-Adaptive Method for Turbulent Non-Premixed Combusting Flows
A parallel adaptive mesh refinement (AMR) algorithm is proposed and applied to the predictions of turbulent non-premixed compressible combusting flows for both two and three space dimensions. The parallel solution-adaptive algorithm solves the system of partial-differential equations governing …
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Development of an AMR Octree DSMC approach for shock dominated flows
… are described. The code employs an Octree based adaptive mesh refinement (AMR) that gives flexibility in capturing multi-scale physics. It is coupled with a robust cut-cell algorithm to incorporate complex triangulated geometries. With the use of distributed memory systems and …
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General Relativistic Black Hole-Neutron Star Simulations: Effects of Black Hole Spin and Binary Mass Ratio
… hydrodynamics code, which is now capable of adaptive-mesh refinement (AMR), we are able to efficiently and accurately simulate these binaries for multiple orbits through inspiral, merger, and ringdown. We evolve the metric using the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation with …
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A stabilized finite element dynamic overset method for the Navier-Stokes equations
In terms of mesh resolution requirements, higher-order finite element discretization methods offer a more economic means of obtaining accurate simulations and/or to resolve physics at scales not possible with lower-order schemes. For simulations that may have large relative motion between multiple …
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A stabilized finite element dynamic overset method for the Navier-Stokes equations
In terms of mesh resolution requirements, higher-order finite element discretization methods offer a more economic means of obtaining accurate simulations and/or to resolve physics at scales not possible with lower-order schemes. For simulations that may have large relative motion between multiple …
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Adaptive mesh refinement for computational aeroacoustics
… OF ENGINEERING SCIENCES Doctor of Philosophy ADAPTIVE MESH REFINEMENT FOR COMPUTATIONAL AEROACOUSTICS by Xun Huang<br/>This thesis describes a parallel block-structured adaptive mesh refinement (AMR) method that is employed to solve some computational aeroacoustic problems with the aim of …
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Numerical modelling of gravitational wave sources in general relativity
… One of the key capabilities of GRChombo is its adaptive mesh refinement (AMR). This allows the numerical grid to dynamically adjust itself in order to sufficiently resolve the large range of spatial and temporal scales that characteristically arise in non-trivial solutions of GR as a consequence …
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Advanced Spectral Methods for Turbulent Flows
… for decades, there is still room for innovation, refinement and improvement of the methods in terms of efficiency and accuracy, for generalized homogeneous turbulent flows, and especially for specialized applications like the computation of atmospheric flows and numerical weather prediction. In …
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Automatic parallel octree grid generation software with an extensible solver framework and a focus on urban simulation
… exactly represented in the final computational mesh: an octree element is either completely in the domain or entirely outside of it. Any element that contains or is intersected by a geometry facet is removed from the final mesh which results in a 'blocky' or 'stepped' geometry representation and …
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Adaptive mesh refinement in topology optimization
… in stress constrained topology optimization with Adaptive Mesh Refinement (AMR). Regions with stress concentrations dominate the optimized design. As such, we first present an approach to obtain designs with accurately computed stress fields within the context of topology optimization. To achieve …
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Cosmic String Radiation with Adaptive Mesh Refinement
… One technique that can address this issue is adaptive mesh refinement (AMR), which allows the resolution of the numerical grid to adapt to the scale of the features of interest in the simulation. This thesis uses GRChombo, a sophisticated code originally designed for numerical relativity, to …
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Numerical Methods for Compressible Multi-phase flows with Surface Tension
… a posteriori subcell finite volume limiting and adaptive mesh refinement (AMR). In multi-phase flows, the difficulty is to design accurate numerical methods for resolving the phase interface, as well as the simulation of the phenomena occurring at the interface, such as surface tension effects, …
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Numerical simulation of combustion and unburnt products in dual-fuel compression-ignition engines with multiple injection
… fuel spray, combustion and emission processes. Adaptive mesh refinement (AMR) and multi-zone reaction modeling enables simulation in a reasonable time. The latter approach avoids expensive kinetic calculations in every computational cell, with considerable speedup. Two approaches to combustion …
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Numerical modelling of plasmas formed and magnetically controlled in hypersonic flows
… The model is directly implemented within the AMReX framework, which facilitates block-structured parallelism and hierarchical adaptive mesh refinement (AMR). The numerical methodology, combined with advanced EoS, is validated across a wide range of test problems. Quantitative agreement between …
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Simulations of active galactic nucleus feedback in the cores of galaxy clusters
… feedback from active galactic nuclei (AGN) using adaptive mesh refinement (AMR) hydrodynamics simulations of the cores of galaxy clusters. Modeling of feedback from AGN that consist of central super-massive black holes (SMBH) in galaxy clusters through simulations is a very challenging problem. …
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Blast Propagation and Damage in Urban Topographies
… to use and are computationally expensive. Adaptive mesh refinement (AMR) methods alleviate the problem, but are difficult to use for the non-expert and require significant tuning. We aim to make CFD urban blast simulation a primary choice for governments, insurers and engineers through …
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Detailed simulations of bubble-cluster dynamics
… thick enough to be resolved by the underlying mesh and numerical method, yet thin enough to provide an efficient model for dynamics of well-resolved scales. A key advance in our method is that the interface regularization is asymptotically compatible with the thermodynamic laws of the mixture …
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Discontinuous Galerkin methods for compressible and incompressible flows on space-time adaptive meshes
… Galerkin (DG) framework along space-time adaptive meshes. Two main research fields can be distinguished: (1) fully explicit DG methods on collocated grids and (2) semi-implicit DG methods on edge-based staggered grids. DG methods became increasingly popular in the last twenty years mainly …
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