Review on the sensitization of turbulence models to rotation/curvature and the application to rotating machinery

Huang, Xianbei; Yang, Wei; Li, Yaojun; Qiu, Baoyun; Guo, Qiang; Liu, Zhuqing

doi:10.1016/j.amc.2018.08.027

Cited by 26 publications

(8 citation statements)

References 93 publications

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“…Critical areas such as side chambers, blades, and tongue are well refined to meet the requirements of the wall treatment method and then to capture flow details. [38][39][40] Figure 6 shows the mesh sensitivity at the BEP. The head coefficient ψ and efficiency η are plotted against the number of elements.…”

Section: Hexahedral Meshmentioning

confidence: 99%

A Flow Model for Side Chambers of Centrifugal Pumps Considering Radial Wall Shear Stress

Cheng

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The side chamber flow has a fundamental influence on the performance and reliability of centrifugal pumps. However, the radial wall shear stress in the flow modelling of pump side chambers is arbitrarily neglected. The current work proposes a model for the radial wall shear stress, which is an extension of the previous paper (DOI: 10.1115/1.4047532). By using the power-law for the velocity boundary layer and the Blasius law for the wall shear stress, introducing the Ekman layer thickness expression, and deducing the Bödewadt layer thickness expression, the radial wall shear stress on the rotating and stationary disks is formulated and then integrated into the side chamber flow model. Besides, the entire flow field of the centrifugal pump is solved using the computational fluid dynamics (CFD) software ANSYS CFX. The radial wall shear stress calculated by the new side chamber flow model (NSCFM) is in the identical magnitude as CFD. Compared with pressure measurements, NSCFM makes better pressure predictions than CFD from the rear seal to the hub; however, in other areas, CFD results are closer to experimental data than NSCFM results. The flow prediction tools show that the volumetric efficiency and the shroud thrust increase with the increase in flow rate. NSCFM achieves a good compromise between calculation speed and desired accuracy.

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Section: Hexahedral Meshmentioning

confidence: 99%

A Flow Model for Side Chambers of Centrifugal Pumps Considering Radial Wall Shear Stress

Cheng

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…There are several other limitations also in the k-ε model, such as the growth rate of the turbulent kinetic energy is over predicted, reattachment length in the wake of backward-facing step in turbulent flows, and rotating channel flows the k-ε model incorrectly predicts an asymmetric mean velocity profile as symmetric one (74,173). However, the LES model needs high computational cost than commonly used models (177).…”

Section: Turbulencementioning

confidence: 99%

Analysis of rotary ventricular assist devices using CFD technique—A Review

Shukla

Mishra

Tewari

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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With the increasing focus on reducing deaths because of heart ailments, considerable emphasis has been directed toward the development of ventricular assist devices (VADs) that work on the principle of mechanical pumps for supporting an infirm heart. The VADs are used primarily to assist the left ventricle, but their use has been extended for supporting the right ventricle as well as for supporting both ventricles simultaneously. In this connection, computational fluid dynamics (CFD) has evolved as an efficient technique for the design, development, evaluation, and optimization of VADs, enabling the prediction of operational characteristics of VADs as well as detailed global and local flow characteristics for an extensive set of working environments even before the manufacture and use of the actual device. CFD techniques yield valuable insight into the VADs’ effectiveness that enhances its operational behavior and decreases the risk associated with the use of the device, and at the same time decreases the manufacturing lead time and costs associated with the device. CFD has been quite beneficially used for the performance evaluation of VADs, but it still needs further development as hemolysis and thrombosis models cannot be easily integrated with the flow simulations. This review article presents abrief introduction to rotary VADs with a primary focus on the current status of CFD analysis of axial VADs, which provide the most suitable methods for computational design and optimization of VADs. It also identifies critical knowledge gaps and outlines the hematological models and the difficulties encountered in integrating them into CFD. Finally, future work based on the current scenario is also included.

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“…The Reynolds-averaged Navier-Stokes (RANS) equations were used in this case, also taking into account the total energy equation. The SST k-ω turbulence model [25][26][27] was used to close the RANS equations. Furthermore, the transport equations of the turbulent kinetic energy k and specific dissipation rate ω can be expressed as: The ANSYS CFX computational code was utilized to simulate the flow fields.…”

Section: Case Descriptionmentioning

confidence: 99%

A Spatially Distributed Network for Tracking the Pulsation Signal of Flow Field Based on CFD Simulation: Method and a Case Study

Jin

Tao

et al. 2021

Fractal Fract

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The pulsating characteristics in turbulent flow are very important physical quantities. There are many studies focused on the temporal characteristics of pulsation. However, the spatial distribution of temporal states with pulsations rarely receives attention. Therefore, the pulsation tracking network (PTN) method is proposed to track the pulsating characteristics of turbulence. Based on the computational fluid dynamics (CFD) simulation result, the PTN is arranged in a specific region of the flow domain. The fast Fourier Transform (FFT) method is used for time-frequency conversion. As shown in the example of trailing-edge vortex-shedding flow over NACA0009 hydrofoil, important pulsation quantities, including the total pulsation intensity, dominant frequencies, amplitude of frequencies, and the phase and phase difference, can be obtained with a high spatial resolution. The source, reason and attenuation of the vortex-shedding frequency fvs and the 2 fvs frequency caused by vortex-interaction are well indicated. The dominant regions of fvs and 2 fvs are shown and analysed. The propagation and attenuation of vortex-shedding induced pulsation are understood in detail. Based on the comparison against traditional analysis, PTN is found to function as a good supplement for the CFD post-processing by tracking unknown temporal and spatial characteristics. These findings represent a potential breakthrough in terms of solving actual pulsation-excited flow problems.

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Review on the sensitization of turbulence models to rotation/curvature and the application to rotating machinery

Cited by 26 publications

References 93 publications

A Flow Model for Side Chambers of Centrifugal Pumps Considering Radial Wall Shear Stress

A Flow Model for Side Chambers of Centrifugal Pumps Considering Radial Wall Shear Stress

Analysis of rotary ventricular assist devices using CFD technique—A Review

A Spatially Distributed Network for Tracking the Pulsation Signal of Flow Field Based on CFD Simulation: Method and a Case Study

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