Parallel Anisotropic Tetrahedral Adaptation

Park, Michael A.; Darmofal, David L.

doi:10.2514/6.2008-917

Cited by 49 publications

(30 citation statements)

References 60 publications

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“…The metric-based grid mechanics is described by Park and Darmofal. 37,49 It is fully parallelized and interfaces directly with the error estimation process.…”

Section: Output-based Adaptationmentioning

confidence: 99%

Output-Adaptive Tetrahedral Cut-Cell Validation for Sonic Boom Prediction

Park¹,

Darmofal

2008

26th AIAA Applied Aerodynamics Conference

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A cut-cell approach to Computational Fluid Dynamics (CFD) that utilizes the median dual of a tetrahedral background grid is described. The discrete adjoint is also calculated, which permits adaptation based on improving the calculation of a specified output (off-body pressure signature) in supersonic inviscid flow. These predicted signatures are compared to wind tunnel measurements on and off the configuration centerline 10 body lengths below the model to validate the method for sonic boom prediction. Accurate mid-field sonic boom pressure signatures are calculated with the Euler equations without the use of hybrid grid or signature propagation methods. Highly-refined, shock-aligned anisotropic grids were produced by this method from coarse isotropic grids created without prior knowledge of shock locations. A heuristic reconstruction limiter provided stable flow and adjoint solution schemes while producing similar signatures to Barth-Jespersen and Venkatakrishnan limiters. The use of cut-cells with an output-based adaptive scheme completely automated this accurate prediction capability after a triangular mesh is generated for the cut surface. This automation drastically reduces the manual intervention required by existing methods.

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“…The metric-based grid mechanics is described by Park and Darmofal. 37,49 It is fully parallelized and interfaces directly with the error estimation process.…”

Section: Output-based Adaptationmentioning

confidence: 99%

Output-Adaptive Tetrahedral Cut-Cell Validation for Sonic Boom Prediction

Park¹,

Darmofal

2008

26th AIAA Applied Aerodynamics Conference

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“…• vibrational processes (vibrational excitation under electron, N 2 and N impact) [7][8][9], • dissociation of electronic excited states of N 2 and of all electronic states of N + 2 under electron impact [10], • electronic excitation under electron, N 2 and N impact [3,10,11,[13][14][15][16]18], • excitation transfer [11,17,18],…”

Section: Implementation Of the Cr Model Coram-nmentioning

confidence: 99%

Dissociative recombination in reactive flows related to planetary atmospheric entries

Bultel

Annaloro

Druguet

2015

EPJ Web of Conferences

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Abstract. The Dissociative Recombination (DR) processes play a significant role in plasma chemistry. This article illustrates this role from the modeling point of view in the case of reactive flows related to atmospheric entry plasmas. Two situations are investigated, for which the studied plasma is nitrogen. The first configuration corresponds to the relaxation process behind a strong shock wave moving at high Mach number in a shock tube, the second one to the recombination taking place in an expanding plasma flowing in a diverging nozzle. In both cases, the collisional-radiative model CoRaM-N 2 , involving N 2 , N, N + 2 , N + and electrons, is implemented in an Eulerian 1D code able to compute the aerodynamic fields; calculations are performed in standard conditions. We show that, according to the rate coefficients used for the DR processes, the population density of the charged species especially N + 2 is strongly modified only for the post-shock flow.

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“…Either by local mesh modification operators (edge splits, edge collapses and edge swaps) [37][38][39][40] or element bisection (e.g., based on template refinement) [10,[41][42][43][44][45][46][47]. Locality of these methods makes them especially attractive for application in parallel computing, as the necessary communication volume and frequency become limited, boosting parallel performance.…”

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confidence: 99%

Parallel anisotropic mesh refinement with dynamic load balancing for transonic flow simulations

Gepner

Majewski

Rokicki

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The present paper discusses an effective adaptive methods suited for use in parallel environment. An in-house, parallel flow solver based on the residual distribution method is used for the solution of flow problems. Simulation is parallelized based on the domain decomposition approach. Adaptive changes to the mesh are achieved by two distinctive techniques. Mesh refinement is performed by dividing element edges and a subsequent application of pre defined splitting templates. Mesh regularization and derefinement is achieved through topology conserving node movement (r-adaptivity). Parallel implementations of an adaptive use the dynamic load balancing technique.Key words: parallel CFD, adaptation, dynamic load balancing, mesh refinement, parallel efficiency.Parallel anisotropic mesh refinement with dynamic load balancing for transonic flow simulations [28][29][30][31][32]. In general, this approach yields high quality meshes for arbitrarily complex geometries [4,[33][34][35][36]. Nevertheless this approach is difficult to implement in parallel simulations because of the global nature of the remeshing operation.An alternative approach is to apply modifications to the computational mesh only in the regions of interest. Either by local mesh modification operators (edge splits, edge collapses and edge swaps) [37][38][39][40] or element bisection (e.g., based on template refinement) [10,[41][42][43][44][45][46][47]. Locality of these methods makes them especially attractive for application in parallel computing, as the necessary communication volume and frequency become limited, boosting parallel performance.Another possibility is brought by the r-adaptive methods, in which grid nodes are allowed to move without changing the topology of the mesh. This technique is used either to augment local refinement methods [48,49], or as an adaptive tool in itself [50][51][52]. Application of r-adaptive algorithms might be beneficial in parallel computations, as neither the grid topology nor the load balance become affected.Although adaptive methods are well recognised in the academic community, the broader application of adaptation for industrial problems has been limited. This paper presents an approach towards fully parallel and automatic mesh adaptation method that can be used for 3D industrial cases. The h-r adaptive method is developed, suitable for parallel simulation of transonic flows. Adaptivity is accomplished by anisotropic template-based element bisection method. The coarsening step is carried out via an elastic analogy node movement. Anisotropic mesh modifications are driven by a Hessian based approach.

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Parallel Anisotropic Tetrahedral Adaptation

Cited by 49 publications

References 60 publications

Output-Adaptive Tetrahedral Cut-Cell Validation for Sonic Boom Prediction

Output-Adaptive Tetrahedral Cut-Cell Validation for Sonic Boom Prediction

Dissociative recombination in reactive flows related to planetary atmospheric entries

Parallel anisotropic mesh refinement with dynamic load balancing for transonic flow simulations

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