A Tesla valve is a kind of micro-valve without moving parts. Due to the great difference between reverse and forward flow, often used in passive fluid control devices. However, most current components are optimized designed based on asymmetric structures. In this study, pipe system model with symmetric structure proposed. The characteristics flow pressure drop were studied by finite element method dimensional analysis. First, valves different Reynolds number considered. results show that...

AbstractThe foldcore of an origami structure made up rigid triangular units is suggested. This has two stable states: contraction and expansion. The suggested foldcore's peak stress, average densification strain were numerically analyzed at different cutting heights varied parameters n, the damage modes analyzed. Finally, impact rate on proposed structural response energy absorption capacity investigated. state with a 1/5 height was discovered to have best capacity. Increasing n improves its...

Based on the fundamental fact that turbulence does not exist without interaction between fluid viscosity and velocity gradient, a profound reflection was made establishment of equations motion. It found only artificial factor in process establishing motion is how to determine fluid's constitutive equation. This paper argues due very high gradients turbulent flow, second-order terms related deformation rate equation cannot be omitted must retained. establishes correct for viscous fluids,...

Fuzzy flexible fibers attached to biological surfaces can reduce drag and influence fluid flow by altering their shape, an intriguing phenomenon that has garnered increasing attention. The complexity of fluid–structure interaction problems leads highly nonlinear equations describe this issue. Existing analytical solutions, such as perturbation methods series expansion techniques, still do not perfectly align with experimental observations. To address problem, study explores numerical...

In the post-Moore era, three-dimensional fully surrounded channel structure of gate-all-around field-effect transistors (GAAFETs) significantly enhances gate control capabilities. However, its nanoscale features lead to severe overall self-heating effects and thermal spatiotemporal non-uniformity issues. light this, we investigated electrothermal coupling characteristics a 5 nm GAAFET device numerically. First, simulation framework suitable for is established based on density gradient (DG)...

Turbulence, by definition, arises from the interplay between fluid viscosity and velocity gradients. This insight prompted a re-examination of foundational equations motion. The analysis reveals that only arbitrary aspect in formulating these lies choice fluid's constitutive equation. paper argues that, turbulent flow, substantial gradients necessitate retaining second-order terms related to deformation rate equation, which are often neglected. retention leads more accurate equation for...

The fuzzy, flexible fibers attached to biological surfaces not only reduce drag but also undergo nonlinear deformation under shear flow, and the of these in turn affects fluid flow. This phenomenon is increasingly attracting attention. Due complexity fluid–structure interaction problems, existing analytical solutions such as perturbation methods, integral solutions, series expansions are still unable fully address this issue. To tackle problem, paper uses COMSOL finite element software for...

In the realm of fluid dynamics, turbulence inherently necessitates interactions between viscosity and velocity gradients. This study delves into foundation motion equations, identifying determination fluid's constitutive equation as sole artificial element in their derivation. The paper posits that turbulent flows, characterized by intense gradients, second-order terms associated with deformation rate must be retained, rather than dismissed. revelation yields an accurate for viscous fluids,...

In the realm of fluid dynamics, turbulence inherently necessitates interactions between viscosity and velocity gradients. This study delves into foundation motion equations, identifying determination fluid's constitutive equation as sole artificial element in their derivation. The paper posits that turbulent flows, characterized by intense gradients, second-order terms associated with deformation rate must be retained, rather than dismissed. revelation yields an accurate for viscous fluids,...

This paper proposes temporal scaling laws of the density-weighted energy spectrum for compressible turbulence in terms dissipation rate, frequency and Mach number. The study adopts incomplete similarity theory analysis motion. investigation shows that Eulerian Lagrangian spectra approach [Formula: see text] power when number M tends to reach unity infinity, respectively.

It is essential for domino game players to have a quick estimate of dominoes’ propagation speed without engaging in complicated multi-body dynamics simulation. This research article uses directed dimensional analysis propose universal scaling law, v=λghf(δλ), the toppling motion. As an application, two approximate power laws were formulated by curve fitting both theoretical and experimental data. The fitted laws, v∼δλhg, show that proportional square root separation λ, thickness δ,...

The common dandelion uses a bundle of drag-enhancing bristles (the pappus) that enables seed dispersal over formidable distances; however, the scaling laws aerodynamic drag underpinning pappus-mediated flight remain unresolved. In this paper, we find is approximately proportional to −2/3 power pappus Reynolds number, and terminal velocity seeds 3/4 weight. By way, Vogel exponent for determined.

Toroidal shells are widely used in structural engineering. The governing equations of toroidal very complicated because its variable coefficients with singularity. To find their analytical solution, traditionally, the complex form were proposed and some useful solutions obtained. Unfortunately, no any closed-form solution has even been obtained for either general or slender shells. This paper focus on a special case shells, i.e., symmetrical For first time, this kind shell successfully from...