Partitioning strategies for structured multiblock grids

Rantakokko, Jarmo

doi:10.1016/s0167-8191(00)00044-2

Cited by 30 publications

(11 citation statements)

References 21 publications

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“…Point-to-point communication is done by using so called halozones of half the width of the central SBP-operator. The communication across the different grids yields a possibly one-to-many and many-to-one communication pattern, which may have an adverse effect on load-balancing and scalability [7].…”

Section: Computational Toolsmentioning

confidence: 99%

Higher Order Accurate Solutions for Flow in a Cavity: Experiences and Lessons Learned

Eliasson

Kupiainen

Nordström

2015

Lecture Notes in Computational Science and Engineering

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Experiences from using a higher order accurate finite difference multiblock solver to compute the time dependent flow over a cavity is summarized. The work has been carried out as part of a work in a European project called IDIHOM in a collaboration between the Swedish Defense Research Agency (FOI) and University of Linköping (LiU). The higher order code is based on Summation By Parts operators combined with the Simultaneous Approximation Term approach for boundary and interface conditions. The spatial accuracy of the code is verified by calculations over a cylinder by monitoring the decay of the errors of known wall quantities as the grid is refined. The focus is on the validation for a test case of transonic flow over a rectangular cavity with hybrid RANS/LES calculations. The results are compared to reference numerical results from a 2 nd order finite volume code as well as with experimental results with a good overall agreement between the results.

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Section: Computational Toolsmentioning

confidence: 99%

Higher Order Accurate Solutions for Flow in a Cavity: Experiences and Lessons Learned

Eliasson

Kupiainen

Nordström

2015

Lecture Notes in Computational Science and Engineering

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“…Although a variety of mesh generation techniques are available [21], the generation of a suitable mesh for complex, multielement, geometries is still a complex and tedious task. The two traditional approaches are: the use of a structured body-fitted mesh utilising a multi-block structure, in which the blocks may overlap, [22,23,24,25] and the use of a completely unstructured body-fitted mesh [26,27,28]. Both of these approaches require significant effort to ensure that the generated mesh is of sufficient quality to both accurately represent the geometry and provide a high quality solution.…”

Section: Clash -Evk3-ct-2001-00058mentioning

confidence: 99%

Estudo do Galgamento de Estruturas Marítimas utilizando um Modelo Numérico baseado na Teoria da Onda em Condições de Água pouco Profunda

Reis¹,

Neves²

2010

RGCI

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The main objective of Workpackage 5 is to use numerical simulation of wave overtopping in order to solve the problem of suspected scale effects. A second, related, objective is to improve existing codes in such a way as they are able to simulate wave overtopping in a reliable way. The final, single, objective is to numerically model long waves on the shallow foreshore at Petten in order to understand the phenomenon of long waves and their effect on overtopping. This report deals with the work undertaken towards the first two objectives, the simulations undertaken for objective 3 are the subject of a separate report entitled "Influence of low-frequency waves on wave overtopping" by M.R.A. van Gent and C.C. Giarrusso and published by WL | Delft hydraulics in November 2003.Realistic simulations of wave overtopping require numerical methods which are able accurately to simulate the shoaling, breaking and possible overturning of waves prior to their impact on the seawall. It is a further requirement that the simulation continues after impact, modelling the formation of the overtopping jet and the reflection of the wave. The research groups at Manchester Metropolitan University (MMU) and the University of Gent (UGent) have been working in parallel on the development of such numerical codes. The MMU code, AMAZON-SC, is a numerical wave flume based on the free surface capturing approach. While the UGent code, LVOF, is a numerical wave basin based on the volume of fluid approach. This report describes the progress of these numerical methods, in order to address the first two objectives of Workpackage 5. Their application to various cases, is also discussed, including: a test problem involving wave overtopping of a smooth sea-dike, wave overtopping at Samphire Hoe and an investigation of scale effects on rough impermeable structures.The Report begins with a general introduction, followed by a section describing AMAZON-SC (the MMU code), a section describing LVOF (the UGent code) and then some general conclusions.

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“…Then, there are various alternatives for the initial load balancing of the base grid (for an overview, see [25,26]). All of these alternatives are relatively straightforward generalizations of load balancing techniques for single, structured grids.…”

Section: Dynamic Load Balancingmentioning

confidence: 99%

“…For example, Rantakokko used his framework for investigating a variety of algorithms for the partitioning of static, structured grids, both single grids [38] and multi-block grids [25].…”

Section: Dynamic Load Balancingmentioning

confidence: 99%

Parallel Structured Adaptive Mesh Refinement

Rantakokko

Thuné

2009

Parallel Computing

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Parallel structured adaptive mesh refinement is a technique for efficient utilization of computational resources. It reduces the computational effort and memory requirements needed for numerical simulation of complex phenomena, described by partial differential equations. Structured adaptive mesh refinement (SAMR) is applied in simulations where the domain is divided into logically rectangular patches, where each patch is discretized with a structured mesh. The purpose of adaptive mesh refinement is to automatically adapt the mesh to the resolution required to represent important features of the simulated phenomenon in different subdomains. In a parallel computing context, an important consequence of the adaptation is that the dynamically changing resolution leads to a dynamically changing work load, data volume, and communication pattern at run-time. This calls for dynamic load balancing and has implications for data placement as well as parallelization granularity.This chapter gives an overview of structured adaptive mesh refinement approaches. After a brief introductory survey of SAMR techniques and software packages, the main part of the chapter addresses various issues related to implementation of SAMR on parallel computers. In particular programming models, data placement and load balancing are discussed, for shared memory as well as distributed memory platforms. Various approaches and algorithms are presented. The appropriate choice of dynamic load balancing algorithm, data placement strategy, programming model, etc., depends on both the application state and the computer platform. There

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Partitioning strategies for structured multiblock grids

Cited by 30 publications

References 21 publications

Higher Order Accurate Solutions for Flow in a Cavity: Experiences and Lessons Learned

Higher Order Accurate Solutions for Flow in a Cavity: Experiences and Lessons Learned

Estudo do Galgamento de Estruturas Marítimas utilizando um Modelo Numérico baseado na Teoria da Onda em Condições de Água pouco Profunda

Parallel Structured Adaptive Mesh Refinement

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