Transient flow around an impulsively started cylinder using a dynamic mesh method

Wang, L. Q.; Li, Z. F.; Wu, Dazhuan; Zhou, Hao

doi:10.1080/10618560701493872

Cited by 14 publications

(8 citation statements)

References 16 publications

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“…It has been successfully used for unsteady flow problems inside fluid machinery and correctly provides the detailed information of flow field changing. 18 For instance, Wu et al 19 predicted the characteristics of pump during the discharge valve rapid opening process, and the simulation results agree well with the test data, which validated the CFD method in simulating the transient events. In fact, the CFD method has been not mature enough to be applied for simulating water hammer events.…”

Section: Introductionmentioning

confidence: 67%

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

Yang

Lai

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this study, three-dimensional computational fluid dynamics simulation was adopted to evaluate the valve-induced water hammer phenomena in a typical tank-pipeline-valve-tank system. Meanwhile, one-dimensional analysis based on method of characteristics was also used for comparison and reference. As for the computational fluid dynamics model, the water hammer event was successfully simulated by using the sliding mesh technology and considering water compressibility. The key factors affecting simulation results were investigated in detail. It is found that the size of time step has an obvious effect on the attenuation of the wave and there exists a best time step. The obtained simulation results have a good agreement with the experimental data, which shows an unquestionable advantage over the method of characteristics calculation in predicting valve-induced water hammer. In addition, the computational fluid dynamics simulation can also provide a visualization of the pressure and flow evolutions during the transient process.

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Section: Introductionmentioning

confidence: 67%

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

Yang

Lai

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The authors validated the dynamic mesh (DM) method in solving transient flow induced by an impulsively starting [18] or translate-rotating circular cylinder [19]. The DM method was extended to solve the two-dimensional transient flow around an impulsively started straight blade [20] and centrifugal pump [21].…”

Section: The Dsr Methodsmentioning

confidence: 99%

Experimental and numerical study of transient flow in a centrifugal pump during startup

et al. 2011

J Mech Sci Technol

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Transient characteristics and flows in a centrifugal pump during its starting period were experimentally and numerically investigated. The two-dimensional particle image velocimetry technique was used to capture transient flow evolutions in the pump's diffuser. A new dynamic slip region method that combines the dynamic mesh method with the non-conformal grid boundaries is proposed to resolve the transient flows caused by the started impeller. Numerical self-coupling was realized by establishing a circulation pipe system along with the pump model equivalent to the experimental pump system. Numerical and experimental results agree well in both explicit characteristics and internal transient flow structures, confirming the validity of the proposed method. Analysis of the instantaneous flow in the impellers indicates that for the early stage of the startup, the transient vortex evolution between blades is the main reason for the transient head coefficient being lower than the steady state value. The reversed flow at the blade inlet is a less important reason for this effect. In later stages, the weakening of the intensity of the spatial vortex visible on S 2m and the main flow stream are the main reasons for the explicit performance slowly rebounding to the steady value.

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“…, 경계적합좌표법 (Wang et al, 2007) 및 Lagrangian법 (Hirt et al, 1974) 등을 대표적으로 들 수 있고, 후자의 경우는 MAC(Marker And Cell)법 (Harlow and Welch, 1965), Level-set법 (Osher and Sethian, 1988), VOF법 (Hirt and Nichols, 1981 …”

Section: 서 론unclassified

Interface Capturing for Immiscible Two-phase Fluid Flows by THINC Method

Lee¹,

Kim²,

Kim³

2012

Journal of Korean Society of Coastal and Ocean Engineers

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핵심용어 : THINC법, VOF법, 혼상류수치모델, Navier-Stokes solver Abstract : In the numerical simulation of wave fields using a multi-phase flow model that considers simultaneous flows of materials with different states such as gas, liquid and solid, there is need of an accurate representation of the interface separating the fluids. We adopted an algebraic interface capturing method called tangent of hyperbola for interface-capturing(THINC) method for the capture of the free-surface in computations of multi-phase flow simulations instead of geometrical-type methods such a volume of fluid(VOF) method. The THINC method uses a hyperbolic tangent functions to represent the surface, and compute the numerical flux for the fluid fraction functions. One of the remarkable advantages of THINC method is its easy applicability to incorporate various numerical codes based on Navier-Stokes solver because it does not require the extra geometric reconstruction needed in most of VOF-type methods. Several tests were carried out in order to investigate the advection of interfaces and to verify the applicability of the THINC method to wave fields based on the one-field model for immiscible two-phase flows (TWOPM). The numerical results revealed that the THINC method is able to track the interface between air and water separating the fluids although its algorithm is fairly simple.

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Transient flow around an impulsively started cylinder using a dynamic mesh method

Cited by 14 publications

References 16 publications

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

Experimental and numerical study of transient flow in a centrifugal pump during startup

Interface Capturing for Immiscible Two-phase Fluid Flows by THINC Method

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