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Results for “adaptive meshes”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A DPG Space-Time Vlasov-Poisson Discretization with Adaptive Mesh Refinement.
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A Verified Conforming Transient h-r Unstructured Adaptive Mesh Refinement (cThruAMR) Method for Capillary Hydrodynamics
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DPG-Based Vlasov Solvers with Adaptive Mesh Refinement
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A Low Diffusion Verified Conforming Transient h-r Unstructured Adaptive Mesh Refinement (cThruAMR) Method for Coupled Interface Problems
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Advances in a 10-node composite tetrahedral framework for shock and mesh adaptivity
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A Low Diffusion Verified Conforming Transient h-r Unstructured Adaptive Mesh Refinement (cThruAMR) Method for Coupled Interface Problems
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Finite Element Basis Compression for Extreme-Scale Simulations and R-Adaptive Mesh Optimization to Enable Compression
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Discrete Goal-Oriented Error Estimation and Mesh Adaptation for Finite Deformation Elastoplasticity
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Advances in a 10-node composite tetrahedral framework for shock and mesh adaptivity
Presenting this work at USNCCM
Control of element shape and alignment for 3D solution adaptive mesh generation
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Investigation of transonic flow in a cascade using an adaptive mesh
The solution of two-dimensional full potential equation for the analysis of steady transonic flow through cascades is investigated. Finite element method is employed in the analysis. Accuracy and efficiency of the obtained numerical solutions are discussed in terms of the employed computational grid. Accurate modeling of subsonic and supersonic flow regions together with the shock is discussed. The choice of artificial viscosity and relaxation factors are examined and related to the design of a computational grid. Shock capturing and shock fitting procedures are compared for improved accuracy and efficiency. Numerical results include cascades of Gostelow and NACA 0012 airfoils.
Accurate multigrid solution of the Euler equations on unstructured and adaptive meshes
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Algebraic turbulence modeling for unstructured and adaptive meshes
An algebraic turbulence model based on the Baldwin-Lomax model, has been implemented for use on unstructured grids. The implementation is based on the use of local background structured turbulence meshes. At each time-step, flow variables are interpolated from the unstructured mesh onto the background structured meshes, the turbulence model is executed on these meshes, and the resulting eddy viscosity values are interpolated back to the unstructured mesh. Modifications to the algebraic model were required to enable the treatment of more complicated flows, such as confluent boundary layers and wakes. The model is used in conjuction with an efficient unstructured multigrid finite-element Navier-Stokes solver in order to compute compressible turbulent flows on fully unstructured meshes. Solutions about single and multiple element airfoils are obtained and compared with experimental data.
Algebraic turbulence modeling for unstructured and adaptive meshes
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Time-dependent grid adaptation for meshes of triangles and tetrahedra
This paper presents in viewgraph form a method of optimizing grid generation for unsteady CFD flow calculations that distributes the numerical error evenly throughout the mesh. Adaptive meshing is used to locally enrich in regions of relatively large errors and to locally coarsen in regions of relatively small errors. The enrichment/coarsening procedures are robust for isotropic cells; however, enrichment of high aspect ratio cells may fail near boundary surfaces with relatively large curvature. The enrichment indicator worked well for the cases shown, but in general requires user supervision for a more efficient solution.
Computation of propulsion-related flowfields using unstructured adaptive meshes
In this paper, we describe a computational fluid dynamics (CFD) technique based on unstructured triangular/tetrahedral meshes. A finite-volume scheme is used in conjunction with a multi-stage Runge-Kutta algorithm. Convergence enhancements in the form of dual time-stepping and time-derivative preconditioning are used to overcome the limitations of conventional multi-stage schemes. The method is applied to propulsion-related flows and shown to perform satisfactorily.
Evaluation of discretization procedures for transition elements in adaptive mesh refinement
Three transition interpolation schemes for use in h-or r-refinement have been analyzed in terms of accuracy, implementation ease and extendability. They include blending-function interpolation, displacement averaging, and strain matching at discrete points along the transition edge lines. The results suggest that the choice of matching depends strongly on the element formulations, (viz. displacement or assumed strain, etc.) and mesh refinement criteria employed, and to a lesser extent the choice of computer architecture (serial vs. parallel) and the equation solution procedures. A recommended pairing of some of the elements with the choice factors is suggested.