An Improvement of Accuracy of the MPS Method With a New Gradient Calculation Model

Iribe, Tsunakiyo; Nakaza, Eizo

doi:10.2208/kaigan.67.36

Cited by 10 publications

(9 citation statements)

References 10 publications

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“…Wu and Liu [22] had simulated tsunami generation from a rigid wedge sliding down a slope, using a modified volume of fluid (VOF) method, as well as a moving boundary algorithm, and compared their three-dimensional numerical results, with the corresponding experimental data obtained by Raichlen and Synolakis [23]. In this chapter, we will study several fundamental characteristics of tsunami generation caused by a landslide, or a sector collapse, on the basis of two-dimensional vertical results, obtained through a numerical simulation using a moving particle semi-implicit (MPS) model [24], where the falling body is assumed to be a fluid, or a rigid body, which moves down a slope with a constant gradient.…”

Section: Tsunami 36mentioning

confidence: 99%

“…Numerical computations have been performed that represent tsunami generation due to a body, which moves down a slope. In the present calculation, the numerical model, developed by Iribe and Nakaza [24], based on the MPS method designed by Koshizuka and Oka [29], is applied to consider the furious water motion. The water surface level is determined using the spatial gradient of particle-number density, to inhibit pressure disturbance at the water surface.…”

Section: Numerical Modelmentioning

confidence: 99%

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Tsunami Generation Due to a Landslide or a Submarine Eruption

Kakinuma¹

2016

Tsunami

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Tsunamis can be triggered by not only submarine earthquakes, but also by landslides, and submarine volcanic eruptions. First, several characteristics of tsunami generation due to a landslide, or a sector collapse, are studied, with the tsunamis simulated numerically, to represent their generation through an interaction between falling bodies, and seawater, in two vertical dimensions. The falling body is assumed to be a fluid, or a rigid body, which moves down a slope with a constant gradient. Second, the mechanism of tsunami generation caused by a submarine volcanic eruption, is discussed, focusing on a phreatomagmatic explosion, where after exposure to high temperature magma, seawater evaporates instantly, with an explosive increase in its volume. An index for submarine volcanic explosive force, concerning tsunami generation, has been developed, by assuming the relationship between a phreatomagmatic explosion, and the resultant initial tsunami waveform. A numerical simulation was also generated, with a specific value for this index, for the propagation of tsunamis due to a submarine volcanic eruption in Kagoshima Bay, where a submarine explosion, leading to tsunami generation, has been observed.

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Section: Tsunami 36mentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

Tsunami Generation Due to a Landslide or a Submarine Eruption

Kakinuma¹

2016

Tsunami

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“…The Lagrangian model, developed by Iribe and Nakaza (2011), based on the MPS method designed by Koshizuka and Oka (1996), is applied to consider the furious water motion. The water level is determined using the spatial gradient of particle-number density, to inhibit pressure disturbance at the water surface.…”

Section: Numerical Methods and Conditionsmentioning

confidence: 99%

A Numerical Simulation for Tsunamis Due to a Land Slide

Kakinuma¹,

Iribe²

2020

Int. Conf. Coastal. Eng.

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Tsunamis, generated by falling rigid bodies, have been numerically simulated using the MPS model, in the vertical two dimensions. The numerical result for the water surface displacement of the first wave is in harmony with the corresponding experimental result obtained using the cylinders. A tsunami component traveling toward the shore and running up the slope can be confirmed in the present cases. The tsunami height, immediately after the large circles enter the water, does not depend much on the offshore still water depth, while the tsunami-height reduction is suppressed, when the offshore still water depth is shallower. Conversely, the tsunami height, immediately after the small circles enter the water, increases as the offshore still water depth is shallower. Both the tsunami height, immediately after the falling bodies enter the water, and the reduction rate of tsunami height, are larger for the large circles than for the small circles. In the cases where the falling rigid bodies include both the large and small circles, the reduction rate of the water level near the tsunami source is larger, when the large circles are stacked on the offshore side at the initial condition.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/BEUWDCV_T5k

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“…Tanaka et al improved the accuracy of pressure calculation by adding the velocity divergence term to the source term of Poisson equation in MPS method 13) . Iribe et al improved the accuracy of gradient calculation 14) , and Tamai et al developed a highly precise spatially discrete scheme of MPS method using the least squares method 15) . Moreover, Matsunaga et al 16) improved the precision of the wall boundary for the highly precise spatially discrete scheme developed by Tamai et al…”

Section: Related Workmentioning

confidence: 99%