Efficient Rotating Frame Simulation in Turbomachinery

Remaki, Lakhdar; Ramezani, Alireza; Ilzarbe, Jesús María Blanco; Antolin, J. I.

doi:10.1115/gt2014-25101

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…This work is an extension of a first version published in an ASME proceedings [16]. The extensions consist of; first, the implementation details of the new algorithm in the context of cell-vertex finite volume method is provided showing that in this context it is quite straightforward.…”

Section: Introductionmentioning

confidence: 99%

New Simplified Algorithm for the Multiple Rotating Frame Approach in Computational Fluid Dynamics

Remaki

Ramezani

Ilzarbe

et al. 2017

Journal of Fluids Engineering

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This paper deals with rotating effects simulation of steady flows in turbomachinery. To take into account the rotating nature of the flow, the frozen rotor approach is one of the widely used approaches. This technique, known in a more general context as a multiple rotating frame (MRF), consists on building axisymmetric interfaces around the rotating parts and solves for the flow in different frames (static and rotating). This paper aimed to revisit this technique and propose a new algorithm referred to it by a virtual multiple rotating frame (VMRF). The goal is to replace the geometrical interfaces (part of the computer-aided design (CAD)) that separate the rotating parts replaced by the virtual ones created at the solver level by a simple user input of few point locations and/or parameters of basic shapes. The new algorithm renders the MRF method easy to implement, especially for edge-based numerical schemes, and very simple to use. Moreover, it allows avoiding any remeshing (required by the MRF approach) when one needs to change the interface position, shape, or simply remove or add a new one, which frequently happened in practice. Consequently, the new algorithm sensibly reduces the overall computations cost of a simulation. This work is an extension of a first version published in an ASME conference, and the main new contributions are the detailed description of the new algorithm in the context of cell-vertex finite volume method and the validation of the method for viscous flows and the three-dimensional (3D) case which is of significant importance to the method to be attractive for real and industrial applications.

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Section: Introductionmentioning

confidence: 99%

New Simplified Algorithm for the Multiple Rotating Frame Approach in Computational Fluid Dynamics

Remaki

Ramezani

Ilzarbe

et al. 2017

Journal of Fluids Engineering

View full text Add to dashboard Cite

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Conceptual Design of a Variable Geometry, Axial Flow Turbocharger Turbine

Pesiridis¹,

Saccomanno²,

Tuccillo³

et al. 2017

SAE Technical Paper Series

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The modern automotive industry is under strict regulations to reduce emissions to comply with the Kyoto Protocol, a universally acknowledged treaty aiming at reducing exhaust gas emissions. In order to achieve the required future emission reduction targets, further developments on gasoline engines are required. One of the main methods to achieve this goal is the application of engine downsizing. Turbocharging is a cost-effective method of downsizing an engine whilst reducing exhaust gas emissions, reducing fuel consumption and maintaining prior performance outputs. For these reasons, the turbocharging is becoming the most widely adopted technology in the automotive markets. In 2012, 32% of passenger and commercial vehicles sold had a turbocharger installed, and is predicted to be 40% of 2017 [1]. Even if the engine turbocharging is a widespread technology, there are still drawbacks present in current turbocharging systems. The main problem is overcoming the issue of turbo-lag, which is the poor initial response of the turbocharger to the driver commands due to its inertia. Indeed, the system turbine plus compressor is characterized by an own rotational inertia, therefore, the turbocharger will take a certain time to accelerate and produce the desired boost when a higher amount of exhaust gas is sent to the system. In this work, an innovative solution to the turbo-lag phenomenon will be analyzed: a vaneless stator-axial flow turbine. The proposed turbine configuration would improve the transient response of the system since the axial turbine has intrinsically a lower inertia than the radial turbine as stated by the research works of Ford first [2] and Honeywell after [3]. The whole design process is presented in this paper and particular relevance has been given to the thermo-fluid-dynamic aspect of the machine. Several CFD investigations have been carried out in order to deeply understand the new turbine behavior and, thanks to a 1D model of the target engine, it has been possible to validate the new design simulating the performance of the system engine + turbocharger.

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Efficient Rotating Frame Simulation in Turbomachinery

Cited by 2 publications

References 7 publications

New Simplified Algorithm for the Multiple Rotating Frame Approach in Computational Fluid Dynamics

New Simplified Algorithm for the Multiple Rotating Frame Approach in Computational Fluid Dynamics

Conceptual Design of a Variable Geometry, Axial Flow Turbocharger Turbine

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