FEM/FDM composite scheme for viscous incompressible flow analysis

Ikegawa, Masahiro; Kaiho, Masayuki; Kato, Chisachi

doi:10.1016/0045-7825(94)90023-x

Cited by 11 publications

(5 citation statements)

References 4 publications

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“…To reduce computational costs of the remeshing process required by the global mesh system, the overlapped mesh system, which is also called multi-block mesh system or Chimera grid system, has been proposed [3,18,38]. In this approach, unstructured grids that conform to the body surface and follow the body motion are only arranged in the vicinity of the moving body and the rest of domain is discretized by fixed structured grids.…”

Section: Introductionmentioning

confidence: 99%

A fixed-grid model for simulation of a moving body in free surface flows

Lin

2007

Computers & Fluids

119

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Section: Introductionmentioning

confidence: 99%

A fixed-grid model for simulation of a moving body in free surface flows

Lin

2007

Computers & Fluids

119

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“…At every time step, the velocity components and static pressure within each such margin are the values interpolated in the computational mesh of the corresponding neighbor. Elementwise trilinear functions are used to interpolate both the velocity components and the static pressure (Ikegawa et al, 1994;Kaiho et al, 1997). When velocity components are overset, an appropriate coordinate transformation must be applied to take into account the differences between the frames of reference.…”

Section: Numerical Methods Overset Grids From Multiple Dynamic Frames mentioning

confidence: 99%

Large‐Eddy Simulation of Unsteady Flow in a Mixed‐Flow Pump

Kato

Mukai

Manabe

2003

International Journal of Rotating Machinery

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This article describes the large-eddy simulation (LES) of the internal flows of a high–specific-speed, mixed-flow pump at low flow-rate ratios over which measured head-flow characteristics exhibit weak instability. In order to deal with a moving boundary interface in the flow field, a form of the finite-element method in which overset grids are applied from multiple dynamic frames of reference has been developed. The method is implemented as a parallel program by applying a domain-decomposition programming model.The predicted pump heads reproduce the instability and agree fairly well with their measured equivalents, although the predicted stall takes place at a flow-rate ratio that is a few percentage points lower than the measurements. The phase-averaged distributions of the meridional- and tangential velocity components at the impeller's inlet and exit cross sections were also compared with those measured by laser-Doppler velocimetry. Reasonably good agreements have been obtained between the computed and measured profiles. The developed LES program thus seems to be a promising design tool for a high–specific-speed, mixed-flow pump, particularly for off-design evaluations.

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“…For example, the finite difference method (FDM) is very effective in numerical solution procedures and it has advantages due to its shorter computing time and storage, but it needs a special boundary presentation and the results may not be accurate. Although for problems with any indiscriminate geometric shapes, FEM can be helpful, it needs more time for computing and storage compared to the FDM [15]. On the other hand, the effects and consequences of large deformation and post-failure events are still imperative research topics in the geomechanics area and are under debate.…”

Section: Numerical Simulationmentioning

confidence: 99%

Numerical experimental comparison of mudflow by smoothed particle hydrodynamics (SPH)

Bokharaeian

Naderi

Csámer

2021

IRASE

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Flow-like landslides are a serious geologic hazard that can cause life and property loss all over the world. Mudflow is a kind of debris flow that has been classified as a non-Newtonian flow. The Smoothed particle hydrodynamics method (SPH) is a powerful tool for modeling fluids, such as debris/mudflows, which can be described in terms of local interactions of their constituent parts. In this paper, the Herschel-Buckley rheology model and SPH are used to simulate free-surface mudflow under the gate. The run-out distance and velocity of mudflow during the time are calculated with numerical simulation and compared with the laboratory result. Our results indicate the rate of increase of run-out and viscosity in the computer model is more than the experimental model and it is because of friction that is assumed to be zero. In the computer simulation, friction is exactly zero but in the experimental model, it could be measured and assumed zero. Finally, Abacus had a good result and can be used for mudflow simulation and protection of run-out distance and viscosity.

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FEM/FDM composite scheme for viscous incompressible flow analysis

Cited by 11 publications

References 4 publications

A fixed-grid model for simulation of a moving body in free surface flows

A fixed-grid model for simulation of a moving body in free surface flows

Large‐Eddy Simulation of Unsteady Flow in a Mixed‐Flow Pump

Numerical experimental comparison of mudflow by smoothed particle hydrodynamics (SPH)

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