Assessment of scale-adaptive turbulence models for volute-type centrifugal pumps at part load operation

Hundshagen, Markus; Casimir, Nicolas; Pesch, Andreas; Falsafi, Sherwin; Skoda, Romuald

doi:10.1016/j.ijheatfluidflow.2020.108621

Cited by 18 publications

(6 citation statements)

References 61 publications

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“…Several studies have shown the potential of scale-adaptive simulations (SAS) in highly transient pump flows compared to conventional statistical turbulence models, in terms of velocity distributions, pressure fluctuations, and integral characteristics [89,93,[129][130][131][132]. The present authors have also demonstrated the benefit of scale-adaptive simulations in single-phase flow in a centrifugal pump [133] and a pump mixer [134]. It was concluded that the SAS yields a sound prediction of the local flow field at only moderately enhanced computational effort compared to URANS.…”

Section: Turbulence-scale Resolving Approach and Scale-adaptive Simul...mentioning

confidence: 72%

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State of the Art on Two-Phase Non-Miscible Liquid/Gas Flow Transport Analysis in Radial Centrifugal Pumps Part C: CFD Approaches with Emphasis on Improved Models

Hundshagen

Skoda

2023

IJTPP

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Predicting pump performance and ensuring operational reliability under two-phase conditions is a major goal of three-dimensional (3D) computational fluid dynamics (CFD) analysis of liquid/gas radial centrifugal pump flows. Hence, 3D CFD methods are increasingly applied to such flows in academia and industry. The CFD analysis of liquid/gas pump flows demands careful selection of sub-models from several fields in CFD, such as two-phase and turbulence modeling, as well as high-quality meshing of complex geometries. This paper presents an overview of current CFD simulation strategies, and recent progress in two-phase modeling is outlined. Particular focus is given to different approaches for dispersed bubbly flow and coherent gas accumulations. For dispersed bubbly flow regions, Euler–Euler Two-Fluid models are discussed, including population balance and bubble interaction models. For coherent gas pocket flow, essentially interface-capturing Volume-of-Fluid methods are applied. A hybrid model is suggested, i.e., a combination of an Euler–Euler Two-Fluid model with interface-capturing properties, predicting bubbly flow regimes as well as regimes with coherent gas pockets. The importance of considering scale-resolving turbulence models for highly-unsteady two-phase flow regions is emphasized.

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Section: Turbulence-scale Resolving Approach and Scale-adaptive Simul...mentioning

confidence: 72%

“…Particular care was taken when turbulence scale-resolving models, such as SAS, were used. Customized hybrid discretization schemes are used for adequate scale resolution, as described elsewhere [76,133].…”

Section: Simulation Methodsmentioning

confidence: 99%

State of the Art on Two-Phase Non-Miscible Liquid/Gas Flow Transport Analysis in Radial Centrifugal Pumps Part C: CFD Approaches with Emphasis on Improved Models

Hundshagen

Skoda

2023

IJTPP

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“…This is something the static constant eddy viscosity model is intrinsically unable to do, and it was conjectured that an anisotropic subgrid model changing its field characteristics according to the scale and anisotropy of the flow would be effective in doing this. (7) 3. Direct Numerical Simulation (DNS)…”

Section: Ii) Dynamic Smagorinsky Model: a Comprehensive Analysismentioning

confidence: 99%

Turbulence Modeling in Navier-Stokes Equations: Challenges and Approaches

2024

IRJMETS

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This paper reviews the literature of turbulence modeling in the Reynolds Averaged Navier Stokes equations (RANS), which is the most widely used technique for simulating turbulent flows. The aim is to provide the reader with the fundamental ideas of turbulence modeling. The research is divided into a few sections. In the introductory section, fundamental knowledge of turbulence and the governing equations will be provided in depth to aid understanding of the later parts of the essay. Following that, the second section elucidates the closure problem in turbulence modeling and gives an idea of why it is such a big issue. The subsequent sections will discuss the various types of RANS models. On the contrary, most engineering problems, direct numerical simulation (DNS) and large eddy simulation (LES) are not suitable to solve turbulent flows due to the high computational cost.

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“…Besides, the comparison between this model indicates that the k-ε model forecasts the flow inside the centrifugal pump accurately enough [17]. As far as the pump's mean flow field is considered, the SAS model has no advantage over the SST model [18].…”

Section: Introductionmentioning

confidence: 97%

Digital Analysis of Common Turbulence Patterns in Centrifugal Pump Flow Simulation Based on COMSOL Multiphysics Software

Niou¹,

Otmani²,

Dekhane³

et al. 2022

IJHT

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The present paper tackles the convergence and performance of three numerical turbulence models in the flow simulation. The benchmark analysis was performed using the COMSOL Multiphysics code, and the turbulence on a centrifugal water pump was generated numerically using the k−ε,k−ω, and k−ω SST models. However, the geometry was conducted on SolidWorks due to its complexity. First, the flow modeling was driven by solving the stationary Navier-Stokes equations. Then, the effects of the tested models, on the numerical CFD simulation, were examined. The analyzed results demonstrated that the best calculation precision was obtained using the k−ω model, whereas the lowest was provided by the k−ω SST model. A remarkable pumping performance was also recorded.

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Assessment of scale-adaptive turbulence models for volute-type centrifugal pumps at part load operation

Cited by 18 publications

References 61 publications

State of the Art on Two-Phase Non-Miscible Liquid/Gas Flow Transport Analysis in Radial Centrifugal Pumps Part C: CFD Approaches with Emphasis on Improved Models

State of the Art on Two-Phase Non-Miscible Liquid/Gas Flow Transport Analysis in Radial Centrifugal Pumps Part C: CFD Approaches with Emphasis on Improved Models

Turbulence Modeling in Navier-Stokes Equations: Challenges and Approaches

Digital Analysis of Common Turbulence Patterns in Centrifugal Pump Flow Simulation Based on COMSOL Multiphysics Software

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