Communication cost estimation for parallel CFD using variable time-stepping algorithms

Chien, Y. T.; Ecer, A.; Akay, H. U.; Secer, S.; Blech, Richard A.

doi:10.1016/s0045-7825(00)00167-5

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…Continuity equation can be written as: It is now known that many factors, such as turbulence models, can influence the accuracy and reliability of a CFD simulation, and many research have assessed the effect of different such factors on numerical solutions [19], [20]. In FLUENT, there are three main k-ε turbulence models: the standard (STD) k-ε turbulence model [21], the RNG k-ε turbulence model [22] and the Realizable k-ε model [23].…”

Section: Numerical Simulation Methods a The Governing Equations Omentioning

confidence: 99%

Simulation of Atmospheric Flow Characteristics and Selection of Models for Artificial Simulated Fog-Haze Environment

Zheng

Yin

2020

IEEE Access

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The devices for artificial flashover experiment should be constructed and the stability of the airflow field is the key to construct it. This work presents a methodology of constructing three models respectively without blades, with straight blades and with curved blades, coupled for artificial simulated fog-haze environment with computational fluid dynamics (CFD), to predict the impact of the rotating blades on the flow velocities in the enclosed environment by simulation. Atmospheric flow characteristics and variation of flow velocities were analyzed, and the influences of different rotating blades on flow velocities were compared to get the related simulation results in three models. It is showed that the flow velocities increase with the increase of device's Y coordinate. Compared with the variation of flow velocities in the model without blades, it is confirmed that the variation of flow velocities in two models with blades is reduced relatively, in which the variation of flow velocities in the model with straight blades is lower and more stable. Therefore, the designed model with straight blades will be developed for artificial flashover experiment. INDEX TERMS Simulated fog-haze environment, computational fluid dynamics (CFD), atmospheric flow characteristics, blades.

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Section: Numerical Simulation Methods a The Governing Equations Omentioning

confidence: 99%

Simulation of Atmospheric Flow Characteristics and Selection of Models for Artificial Simulated Fog-Haze Environment

Zheng

Yin

2020

IEEE Access

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“…Lohner provided wave-front domain-splitting algorithm so that grids in the sub-domain and their boundaries are more favorable for grid generation. However, there exist several aspects to be improved in Lohner's methods, such as optimization of sub-domain boundary and grid smoothness; at the same time, there are too many communication overheads [17][18][19] in the method of Okusanya's Delaunay triangulation. Hence, it is necessary to further improve the parallel grid generation technique [20][21][22] to solve flow problem with complex geometries [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Unstructured mesh generation based on Parallel Virtual Machine in cyber-physical system

Dong

Zong

et al. 2019

J Wireless Com Network

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A parallel unstructured mesh generation technique is proposed based on the built-in cyber-physical system (CPS) of Parallel Virtual Machine context. A static load-balancing strategy for computational domain decomposition is firstly presented in the paper. After dividing the whole computational domain into several sub-domains, unstructured grids are separately generated in each sub-domain using the advancing-front grid generation technique. Besides, for a dynamic load-balancing strategy, Lohner's advancing front domain-splitting algorithm is improved to make the sub-grids and their boundaries more favorable for the grid generation. Moreover, a new optimization strategy of sub-domain's boundary is simultaneously presented to smooth the boundaries and improve the quality of grids. Finally, conditions of receiving new points and elements are also developed during the grid generation in the subdomain. Meanwhile, a new strategy of receiving new elements and refusing new points during the interface grid generation is proposed, which can save computational cost. A new parallel Laplacian smoother technique is implemented to generate high-quality mesh. Meshes for NACA0012 airfoil, cylinder, and multi-element airfoil are generated by the improved parallel algorithm using the static and dynamic load-balancing strategies. Some comparisons of parallel calculations are also made using the different number of processors in the tables.

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“…The basic idea of domain decomposition method is to break down a given area into several sub‐regions according to certain principles, establish the relationships between local solution and global solution by selecting the local numerical solution of independent sub‐problems and then integrate the local solution into global solution. Because of its characteristics for constructing parallel algorithm, domain decomposition in the CFD field develops rapidly in recent years and has become one of the most active studies of parallel computing , which is widely applied in fluid dynamics, petroleum exploration, numerical weather prediction, and other aspects. The main drawbacks of previous studies on CFD parallelization are their low data locality, high communication, and synchronization cost.…”

Section: Introductionmentioning

confidence: 99%

Efficient parallel implementation of incompressible pipe flow algorithm based on SIMPLE

Zhang

Yuan

Wan

et al. 2013

Concurrency and Computation

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SUMMARYParallel semi-implicit method for pressure-linked equations(SIMPLE) algorithm is used to solve the 3-D incompressible pipe flow problem. In this paper, we proposed a novel parallel SIMPLE algorithm that uses the alternate tiling technique. Firstly, a parallel SIMPLE algorithm based on domain decomposition method was established, and the implementation of domain partition and data exchange was presented. Then, we presented serial finite difference stencil algorithm based on alternate tiling. Furthermore, an iteration space parallel two-way finite difference stencil algorithm based on alternate tiling was proposed, introducing the sequence of iterative space tiles as the sequence of execution and using time skewing technique to partition the iteration space, thus to improve the data locality of algorithm. The cache misses and the cost of communication and synchronization are reduced by reordering the tiles of iteration space. Finally, the effectiveness of the two parallel SIMPLE algorithms were compared. The results showed that the parallel SIMPLE algorithm that uses the two-way finite difference stencil algorithm based on alternate tiling has good data locality, performance, and scalability in the Deepcomp7000 cluster computing environment. Copyright

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Communication cost estimation for parallel CFD using variable time-stepping algorithms

Cited by 7 publications

References 10 publications

Simulation of Atmospheric Flow Characteristics and Selection of Models for Artificial Simulated Fog-Haze Environment

Simulation of Atmospheric Flow Characteristics and Selection of Models for Artificial Simulated Fog-Haze Environment

Unstructured mesh generation based on Parallel Virtual Machine in cyber-physical system

Efficient parallel implementation of incompressible pipe flow algorithm based on SIMPLE

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