Large eddy simulation of turbulent flows via domain decomposition techniques. Part 1: theory

Manna, M.; Benocci, C.; Simons, Erwin

doi:10.1002/fld.902

Cited by 15 publications

(15 citation statements)

References 32 publications

(83 reference statements)

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“…Therefore, the velocities at the gird points on the interface are obtained from Equation (13) and are used as vibrating boundary conditions for the simulation of the fluid phase.…”

Section: Fem Of Vibrationmentioning

confidence: 99%

Large eddy simulation of turbulent flow in a true 3D Francis hydro turbine passage with dynamical fluid–structure interaction

Zhang

Guo

Wang

2006

Numerical Methods in Fluids

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SUMMARYResults are described from a combined numerical and laboratory model study of the turbulent flow in a true 3D blade passage of a Francis hydro-turbine. The large eddy simulation (LES) is applied to investigate the intrinsic features and the spatial and temporal variations of the flow structures in the blade passage with strong wakes in inflow sweeping and the turbulence-induced blade vibration. The flow passes through the vibrating boundaries. Therefore, the system under consideration is in a dynamic fluid-structure interaction (FSI). In the simulation, one-coefficient dynamic sub-grid scale (SGS) model is incorporated in LES with Reynolds number 148 400 to better describe the energy exchange mechanism between large and small scales under the influences of strong geometrical curvature and vibrating boundaries. The governing equation of the blade vibration with FSI has been established by generalized variational principle combining the fluid and the structure. The vibration analysis is carried out by using Wilson-method. Separate iteration schemes are applied to solve the flow and the vibration in turn. The pressures on the wall sides of the blade and its vibrating accelerations are simultaneously measured. The numerical results show that the temporal and spatial distributions of turbulence in the 3D blade passage are significantly influenced by the curvature of blade configuration, the blade vibration, and the distorted wakes generated by flow passing through guide vanes. The influences of the vibration on the near-wall flow structures are quite remarkable. The simulated results are favourably compared with the measurements.

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“…Therefore, the velocities at the gird points on the interface are obtained from Equation (13) and are used as vibrating boundary conditions for the simulation of the fluid phase.…”

Section: Fem Of Vibrationmentioning

confidence: 99%

Large eddy simulation of turbulent flow in a true 3D Francis hydro turbine passage with dynamical fluid–structure interaction

Zhang

Guo

Wang

2006

Numerical Methods in Fluids

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“…To conclude, present results represent a full validation of the methodology detailed in [5] and allow to propose it as a cost-e ective and exible solution to the simulation of more challenging ows.…”

Section: Discussionmentioning

confidence: 95%

“…The present investigation has put in evidence the capabilities and the performance of the MD technique proposed in the companion paper [5] for LES of complex ows.…”

Section: Discussionmentioning

confidence: 95%

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Large eddy simulation of turbulent flows via domain decomposition techniques. Part 2: applications

Benocci

Giammanco

Manna

et al. 2005

Int. J. Numer. Meth. Fluids

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The present paper discusses the application of large eddy simulation to incompressible turbulent flows in complex geometries. Algorithmic developments concerning the flow solver were provided in the companion paper (Int. J Numer. Meth. Fluids, 2003; submitted), which addressed the development and validation of a multi-domain kernel suitable for the integration of the elliptic partial differential equations arising from the fractional step procedure applied to the incompressible Navier-Stokes equations. Numerical results for several test problems are compared to reference experimental and numerical data to demonstrate the potential of the method. Copyright (c) 2005 John Wiley & Sons, Ltd

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“…Forgber, Lindner, & Schwarze, 2015;Hu, Li, Han, Cai, & Xu, 2016;Insinna, Griffini, Salvadori, & Martelli, 2014;Liu et al, 2015;Luo, Yu, Dai, Fang, and Fan, 2016;Manna, Benocci, & Simons, 2005;Manna, Vacca, & Deville, 2004;Montis et al, 2009;Shi, Xu, & Wei, 2016;Sun, Su, Wang, & Hu, 2016). CFD techniques are also widely employed to solve the Reynolds averaged Navier-Stokes (RANS) or Euler equations in a domain comprising a propeller that is represented through a body-force distribution over a disc area.…”

Section: Introductionmentioning

confidence: 99%

Actuator disc methods for open propellers: assessments of numerical methods

Bontempo

Manna

2016

Engineering Applications of Computational Fluid Mechanics

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The paper describes the assessment of two different actuator disc models as applied to the flow around open propellers. The first method is based on a semi-analytical approach returning the solution for the nonlinear differential equation governing the axisymmetric, steady, inviscid and incompressible flow around an actuator disc. Despite its low computational cost, the method does not require simplifying assumptions regarding the shape of the slipstream, e.g. the wake contraction is not disregarded or prescribed in advance. Moreover, the presence of a tangential velocity in the wake as well as the spanwise variation of the load are taken into account. The second one is a commonly used procedure based on CFD techniques in which the effects of the propeller are synthetically described through a set of body forces distributed over the disc surface. Both methods avoid the difficulties and the computational costs associated with the resolution of the propeller blades geometrical details. The comparison is based on an in-depth error analysis of the two procedures which results in a set of reference data with controlled accuracy. An excellent agreement has been documented between the two methods while the computational complexity is obviously very different. Among other things the comparison is also aimed at verifying the accuracy of the semi-analytical approach at each point of the computational domain and at quantifying the effect of the errors embodied in the two methods on the quality of the solution, both in terms of global and local performance parameters. Furthermore, the paper provides a set of reference solutions with controlled accuracy that could be used for the verification of new and existing computational methods. Finally, the computational cost of the semi-analytical model is quantified, thus providing a valuable information to designers who need to select a cost effective and reliable analysis tool. ARTICLE HISTORY

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Large eddy simulation of turbulent flows via domain decomposition techniques. Part 1: theory

Cited by 15 publications

References 32 publications

Large eddy simulation of turbulent flow in a true 3D Francis hydro turbine passage with dynamical fluid–structure interaction

Large eddy simulation of turbulent flow in a true 3D Francis hydro turbine passage with dynamical fluid–structure interaction

Large eddy simulation of turbulent flows via domain decomposition techniques. Part 2: applications

Actuator disc methods for open propellers: assessments of numerical methods

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