Virtual Gas Turbines: Geometry and Conceptual Description

Mare, Luca di; Kulkarni, Davendu; Wang, Feng; Romanov, A. K.; Ramar, Pandia R.; Zachariadis, Zachos

doi:10.1115/gt2011-46437

Cited by 22 publications

(12 citation statements)

References 4 publications

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“…The proposed method has been implemented in the in-house CFD solver AU3X [18,19]. AU3X solves the unsteady Reynolds-Averaged Navier-Stokes (RANS) equations implicitly on unstructured meshes using a cell-centered finite volume scheme.…”

Section: Solution Methodsmentioning

confidence: 99%

Efficient Approach for Simulating Aperiodic Flows due to Geometry Distortions

Wang

Mare

2020

AIAA Journal

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This paper presents an efficient approach for modelling aperiodic flows in an assembly due to geometry distortions. Firstly, a relation is established in physical space between grid displacement and flow perturbation based on linear theory. This relation is then extended to an assembly of components and projected to the Fourier space. A relation is thus constructed between grid displacement and flow perturbation in the frequency domain. Finally, the non

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Section: Solution Methodsmentioning

confidence: 99%

Efficient Approach for Simulating Aperiodic Flows due to Geometry Distortions

Wang

Mare

2020

AIAA Journal

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“…The test vehicle for this study is AU3X [9], [10], a cell-centred finite-volume code used for solving the unsteady Favre-averaged Navier Stokes equations on unstructured meshes in both time and frequency domains. The solver obtains steady solutions via pseudo-time marching and timeaccurate solutions by dual-time stepping.…”

Section: Unstructured Finite-volume Cfd Solver a Overviewmentioning

confidence: 99%

Software Prefetching for Unstructured Mesh Applications

Hadade

Jones

Wang

et al. 2018

2018 IEEE/ACM 8th Workshop on Irregular Applications: Architectures and Algorithms (IA3)

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Applications that exhibit regular memory access patterns usually benefit transparently from hardware prefetchers that bring data into the fast on-chip cache just before it is required, thereby avoiding expensive cache misses. Unfortunately, unstructured mesh applications contain irregular access patterns that are often more difficult to identify in hardware. An alternative for such workloads is software prefetching, where special non-blocking instructions load data into the cache hierarchy. However, there are currently few examples in the literature on how to incorporate such software prefetches into existing applications with positive results.This paper addresses these issues by demonstrating the utility and implementation of software prefetching in an unstructured finite volume CFD code of representative size and complexity to an industrial application and across a number of processors. We present the benefits of auto-tuning for finding the optimal prefetch distance values across different computational kernels and architectures and demonstrate the importance of choosing the right prefetch destination across the available cache levels for best performance. We discuss the impact of the data layout on the number of prefetch instructions required in kernels with indirect-access patterns and show how to integrate them on top of existing optimisations such as vectorisation. Through this we show significant full application speed-ups on a range of processors, such as the Intel Xeon Skylake CPU (15%) as well as on the in-order Intel Xeon Phi Knights Corner (1.99×) architecture and the out-of-order Knights Landing (33%) manycore processor.

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“…This article presents an approach that can significantly reduce the time-cost in preliminary thermal-mechanical design, which in nature is highly iterative and involves large number of boundary condition data. The methodology is built upon the feature-based system previously proposed by the authors (29) and allows sets of BCs to be represented parametrically. The parameterisation of BCs is associated to engine assembly features enabling the establishment of the one-to-one mapping between its geometric model and related thermal-mechanical model.…”

Section: March 2018mentioning

confidence: 99%

“…The authors previously presented a feature-based geometric modelling system for the representation of gas turbine assemblies (29) . This system is based on abstraction.…”

Section: Parametric Boundary Condition Representation 21 Bc Configurmentioning

confidence: 99%

Data re-use for preliminary thermal-mechanical design of gas turbine engines

et al. 2018

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Thermal-mechanical design is a time-consuming process even at its preliminary design stage. This is due to the large number of components and boundary condition data, the complexity of the geometry, and the iterative nature of the design process. The conventional design process separates the geometric and physical models and results in considerable human interventions during the design process. By assigning the breakpoints to engine assembly features as internal parameters, this article reports a novel feature-based design approach where the associated boundary conditions are represented parametrically along the feature geometric contours. They are updated automatically as per the geometrical changes, including topological changes, and hence bridging the gap between the geometric and physical models. The current approach enables data re-use of both the geometries and physical information from previous engine designs to generate new designs, dispensing with the excessive human interventions. Although the methodology is generic and applicable to other design scenarios, its capability is demonstrated in this article by some representative challenging industrial applications, sitting in the 2D preliminary gas-turbine design domain. The test cases show that the method can significantly reduce the time-cost of the iterative thermal-mechanical design flow.

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Virtual Gas Turbines: Geometry and Conceptual Description

Cited by 22 publications

References 4 publications

Efficient Approach for Simulating Aperiodic Flows due to Geometry Distortions

Efficient Approach for Simulating Aperiodic Flows due to Geometry Distortions

Software Prefetching for Unstructured Mesh Applications

Data re-use for preliminary thermal-mechanical design of gas turbine engines

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