Results 21 to 30 of about 1,650 (161)
Flagellar Propulsion of Sperm Cells Against a Time‐Periodic Interaction Force
Advanced Biology, Volume 7, Issue 1, January 2023., 2023 Sperm cells undergo complex interactions with external environments, such as a solid‐boundary, fluid flow, as well as other cells before arriving at the fertilization site. Our work presents consistent theoretical and experimental results important for understanding the adaptive behavior of sperm cells to the external time‐periodic force encountered ...
Zihan Wang +5 more
wiley +1 more source
Variational views of stokeslets and stresslets [PDF]
SeMA Journal, 2014 In this paper we present a self-contained variational theory of the layer potentials for the Stokes problem on Lipschitz boundaries. We use these weak definitions to show how to prove the main theorems about the associated Calder n projector. Finally, we relate these variational definitions to the integral forms.
Sayas, Francisco-Javier +1 more
openaire +3 more sources
Advanced Materials Interfaces, Volume 10, Issue 2, January 17, 2023., 2023 The microfluidic process in combination with Pulse‐Freezing enables the development of highly porous and vertically aligned graphene oxide (GO) films, which can directly work as a free‐standing lithium‐hosting battery electrode. The assembled lithium battery with the porous and aligned GO films shows an excellent half‐cell performance: a 190% specific ...
Yifan Liu +3 more
wiley +1 more source
Geochemistry, Geophysics, Geosystems, Volume 23, Issue 2, February 2022., 2022 Abstract In prior work we found that precise approximation of the continuity constraint is crucial for accurate propagation of tracer data when advected through a background incompressible velocity field (Sime et al., 2021, https://doi.org/10.1029/2020gc009349).
Nathan Sime +2 more
wiley +1 more source
Highly accurate special quadrature methods for Stokesian particle suspensions in confined geometries
International Journal for Numerical Methods in Fluids, Volume 93, Issue 7, Page 2175-2224, July 2021., 2021 We present a highly accurate boundary integral method for simulation of rigid particles in three‐dimensional periodic Stokes flow with confining walls. Our method includes a special quadrature method based on upsampled quadrature and quadrature by expansion, accelerated using a precomputation scheme.
Joar Bagge, Anna‐Karin Tornberg
wiley +1 more source
Impact of Segmented Magnetization on the Flagellar Propulsion of Sperm‐Templated Microrobots
Advanced Science, Volume 8, Issue 8, April 21, 2021., 2021 Sperm‐templated flexible magnetic microrobots are categorized based on the location and combination of their magnetic segments. The different magnetization profiles lead to distinct wave patterns once exposed to rotating 3D magnetic fields. This results in a variety of frequency responses, flow fields surrounding the microrobots and propulsive thrust ...
Veronika Magdanz +7 more
wiley +1 more source
Towards an analytical description of active microswimmers in clean and in surfactant-covered drops [PDF]
, 2020 Geometric confinements are frequently encountered in the biological world and strongly affect the stability, topology, and transport properties of active suspensions in viscous flow.
Ardekani, Arezoo M. +8 more
core +2 more sources
Faxén's law for arbitrary oscillatory Stokes flow past a porous sphere
Archives of Mechanics, 2012 The present article deals with the study of the hydrodynamics of a porous sphere in an oscillatory viscous flow of an incompressible Newtonian fluid. Unsteady Stokes equations are used for the flow outside the porous sphere and Darcy's equation is used ...
J. Prakash, G.P. Raja Sekhar, M. Kohr
doaj +1 more source
Stirring by Periodic Arrays of Microswimmers [PDF]
, 2016 The interaction between swimming microorganisms or artificial self-propelled colloids and passive (tracer) particles in a fluid leads to enhanced diffusion of the tracers. This enhancement has attracted strong interest, as it could lead to new strategies
de Graaf, Joost, Stenhammar, Joakim
core +2 more sources
A Treecode Algorithm for 3D Stokeslets and Stresslets [PDF]
Advances in Applied Mathematics and Mechanics, 2019 The Stokeslet and stresslet kernels are commonly used in boundary element simulations and singularity methods for slow viscous flow. Evaluating the velocity induced by a collection of Stokeslets and stresslets by direct summation requires $\mathcal{O}(N^2)$ operations, where $N$ is the system size.
Wang, Lei +2 more
openaire +2 more sources