Hybrid MPI/OpenMP parallelization of an Euler–Lagrange approach to cavitation modelling

Yakubov, Sergey; Cankurt, Bahaddin; Abdel‐Maksoud, Moustafa; Rung, Thomas

doi:10.1016/j.compfluid.2012.01.020

Cited by 67 publications

(36 citation statements)

References 10 publications

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“…In the Euler-Lagrange approach, separate equations for calculating bubble size and motion are solved for each of the bubbles. More details have already been presented in [3,4,8].…”

Section: Methodsmentioning

confidence: 99%

Numerical Investigation of Cavitation Scale Effects by Bubble Acoustic

Schiller¹,

Abdel‐Maksoud²

2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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This paper focuses on a number of issues related to scale effects based on acoustic cavitation inception. The acoustic pressure emitted by flow bubbles is used to numerically detect the acoustic cavitation inception. The acoustic pressure, the motion as well as the bubble size are calculated by a Lagrange method, which is implemented in the in-house RANS code FreSCo + . In a numerical study on a 2D hydrofoil, various aspects related to water quality, such as e.g. bubble size and bubble concentration, are systematically investigated and analyzed. The inflow velocity and dimension of the investigated body are varied. For a precise definition of acoustic cavitation inception two different criteria are used. They are based on an event rate and an acoustic pressure, which have to be exceeded. The results of the numerical study show that the known cavitation scale effects have a significant influence on the detected cavitation inception number. Based on the analysis of the simulation results for the velocity and body size variation, an extrapolation method is proposed and validated, which is also presented in the paper.

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“…In the Euler-Lagrange approach, separate equations for calculating bubble size and motion are solved for each of the bubbles. More details have already been presented in [3,4,8].…”

Section: Methodsmentioning

confidence: 99%

Numerical Investigation of Cavitation Scale Effects by Bubble Acoustic

Schiller¹,

Abdel‐Maksoud²

2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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“…The communication cost between domains under current setting is thus much lower than a 3D bed with 2D/3D decomposition, where each domain possesses more neighboring domains and a poorer scaling is expected. It is also worth noting that to solve the issues with MPI decomposition discussed previously, progress has recently been made in using hybrid MPI/OpenMP parallelization based on SMP (symmetric multi-processing) architectures [28]. In hybrid parallelization, solid phases are decomposed according to particle numbers rather than attached to static spatial domains decomposed for the fluid phase.…”

Section: Total Number Of Particles N Pmentioning

confidence: 99%

Challenges of DEM: I. Competing bottlenecks in parallelization of gas–solid flows

Liu

Hrenya

2014

Powder Technology

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“…Multi-phase flows are modelled using a specific VOFtype mixture-fraction approach, which can be coupled to a number of Eulerian and Langrangian models for cavitation induced mass transfer between liquid and vapour. Parallelisation follows a domain decomposition approach which scales down to about 15 000 cells per process (Yakubov, Cankurt, Abdel-Maksoud and Rung 2013).…”

Section: Numerical Proceduresmentioning

confidence: 99%

CAD-free hydrodynamic optimisation using consistent kernel-based sensitivity filtering

Kröger

Rung

2015

Ship Technology Research

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This paper advocates the benefits of consistent kernel-based filter functions dedicated to the filtering of shape sensitivities obtained from CAD-free adjoint hydrodynamic shape optimisation procedures. Emphasis is given to explicit corrections of truncated Gaussian filters in discrete space subjected to first-order consistency constraints. The nature of the approach supports an irregular distribution of surface-mesh points without modifying the shape sensitivity influences. The methodology facilitates an apparently simple explicit Lagrangian surface parameterisation at a moderate computational surplus. Results indicate benefits of a consistent approach as regards the conservation of surface-mesh properties and the approach towards optima. Examples indicate the practical impact for aftship and wake-equalising duct examples. Accordingly, O(150) designs that feature large (local) deformations of the initial shape can be examined during a few hours of turn-around time using a single tool rather than a tool chain.

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Hybrid MPI/OpenMP parallelization of an Euler–Lagrange approach to cavitation modelling

Cited by 67 publications

References 10 publications

Numerical Investigation of Cavitation Scale Effects by Bubble Acoustic

Numerical Investigation of Cavitation Scale Effects by Bubble Acoustic

Challenges of DEM: I. Competing bottlenecks in parallelization of gas–solid flows

CAD-free hydrodynamic optimisation using consistent kernel-based sensitivity filtering

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