Circular Pipe Flow Crisis with Mechanical Energy Dissipation

Here, we consider the walking gait patterns. And we presented a hybrid model for a passive 2D walker with knees and point feet. The dynamics of this model were fully derived analytically. We have also proposed virtual coupling control laws. The control strategy is formed by taking into account the features of mechanical energy dissipation and restoration. And we also prove some walking rules maybe true.

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The Use of Nanoporous Materials for Mechanical Energy Dissipation

Poromechanics VI ◽

10.1061/9780784480779.048 ◽

2017 ◽

Cited By ~ 1

Author(s):

Isabelle Beurroies ◽

Damien Presle ◽

Julien Rodriguez ◽

Renaud Denoyel

Keyword(s):

Energy Dissipation ◽

Mechanical Energy ◽

Nanoporous Materials ◽

Mechanical Energy Dissipation

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Study of Mechanical Energy Dissipation by Normal and Decalcified Animals Bones

Biosciences Biotechnology Research Asia ◽

10.13005/bbra/2728 ◽

2019 ◽

Vol 16 (1) ◽

pp. 113-119

Author(s):

Abdul Rauf ◽

Syed Ismail Ahmad

Keyword(s):

Energy Dissipation ◽

Viscoelastic Properties ◽

Applied Load ◽

Mechanical Energy ◽

Maximum Energy ◽

Hysteresis Curve ◽

Normal Bone ◽

Dissipation Of Energy ◽

Mechanical Energy Dissipation ◽

Energy Dissipated

The energy dissipated properties of normal and decalcified femur, rib and scapula bones of animals ox and camel have been studied by uniform bending technique. A hysteresis curve has been observed between the elevation in bone and load applied. It is observed that the energy dissipated as calculated from the hysteresis loop for rib is more than that of femur and scapula of ox and camel. It has been observed that the dissipation of energy in normal bone is less than that of decalcified bone under the same condition of applied load. The highest energy dissipation was observed in case of rib bone of camel compared to that of any other bone, rib of camel and scapula of ox dissipates maximum energy than femur bones. The study suggests that this technique is simple, elegant and inexpensive besides accurate in determining viscoelastic properties of bone.

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Laminar–Turbulent Intermittency in Annular Couette–Poiseuille Flow: Whether a Puff Splits or Not

Entropy ◽

10.3390/e22121353 ◽

2020 ◽

Vol 22 (12) ◽

pp. 1353

Author(s):

Hirotaka Morimatsu ◽

Takahiro Tsukahara

Keyword(s):

Poiseuille Flow ◽

Pipe Flow ◽

Large Scale ◽

Outer Cylinder ◽

Base Flow ◽

Circular Pipe ◽

Turbulence Structure ◽

Transitional Regime ◽

Circular Pipe Flow ◽

Observation Period

Direct numerical simulations were carried out with an emphasis on the intermittency and localized turbulence structure occurring within the subcritical transitional regime of a concentric annular Couette–Poiseuille flow. In the annular system, the ratio of the inner to outer cylinder radius is an important geometrical parameter affecting the large-scale nature of the intermittency. We chose a low radius ratio of 0.1 and imposed a constant pressure gradient providing practically zero shear on the inner cylinder such that the base flow was approximated to that of a circular pipe flow. Localized turbulent puffs, that is, axial uni-directional intermittencies similar to those observed in the transitional circular pipe flow, were observed in the annular Couette–Poiseuille flow. Puff splitting events were clearly observed rather far from the global critical Reynolds number, near which given puffs survived without a splitting event throughout the observation period, which was as long as 104 outer time units. The characterization as a directed-percolation universal class was also discussed.

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