Results 131 to 140 of about 901 (179)
Some of the next articles are maybe not open access.
Wavelength Selection in Gyrotactic Bioconvection
Bulletin of Mathematical Biology, 2015We investigate pattern formation by swimming micro-organisms (bioconvection), when their orientation is determined by balance between gravitational and viscous torques (gyrotaxis), due to being bottom heavy. The governing equations, which consist of the Navier-Stokes equations for an incompressible fluid coupled with a micro-organism conservation ...
Ghorai, S., Singh, R., Hill, N. A.
openaire +2 more sources
Annual Review of Fluid Mechanics, 2020
The term “bioconvection” describes hydrodynamic instabilities and patterns in suspensions of biased swimming microorganisms. Hydrodynamic instabilities arise from coupling between cell swimming behaviors; physical properties of the cells, such as density; and fluid flows.
openaire +1 more source
The term “bioconvection” describes hydrodynamic instabilities and patterns in suspensions of biased swimming microorganisms. Hydrodynamic instabilities arise from coupling between cell swimming behaviors; physical properties of the cells, such as density; and fluid flows.
openaire +1 more source
Photo-gyrotactic bioconvection
Journal of Fluid Mechanics, 2011Many microorganisms exhibit taxes, biased swimming motion relative to a directional stimulus. Aggregations of cells with densities dissimilar to the medium in which they swim can induce hydrodynamic instabilities and bioconvection patterns. Here, three novel and mechanistically distinct models of the interaction of the two dominant taxes in suspensions
Williams, C. R., Bees, M. A.
openaire +2 more sources
Gyrotactic bioconvection at pycnoclines
Journal of Fluid Mechanics, 2013AbstractBioconvection is an important phenomenon in aquatic environments, affecting the spatial distribution of motile micro-organisms and enhancing mixing within the fluid. However, stratification arising from thermal or solutal gradients can play a pivotal role in suppressing the bioconvective flows, leading to the aggregation of micro-organisms and ...
Karimi, A., Ardekani, A. M.
openaire +2 more sources
Bioconvection of gravitactic microorganisms in a fluid layer
International Communications in Heat and Mass Transfer, 2005A study is made of the spontaneous pattern formation of gravitactic microorganisms in a horizontal fluid layer. The linear stability theory is used to determine the onset of convection in terms of the Rayleigh number and the swimming velocity. It is found that the onset of convection in a gravitactic suspension may be very different from that of Benard
A. Bahloul, T. Nguyen-Quang, T.H. Nguyen
openaire +1 more source
An Optimal Control Problem for a Generalized Bioconvective Flow
Acta Applicandae Mathematicae, 2022zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jose L. Boldrini +3 more
openaire +2 more sources
Bioconvective Dynamics: Dependence on Organism Behaviour
Journal of Experimental Biology, 2000ABSTRACT Bioconvection occurs when a macroscopic nonuniformity of the concentration of microbial populations is generated and maintained by the directional swimming of the organisms. This study investigated the properties of the patterns near the onset of the instability and later during its evolution into a fully nonlinear convection ...
A, Czirók, I M, Jánosi, J O, Kessler
openaire +2 more sources
Bioconvective percolation on an incomplete Voronoi grid
Journal of Physics A: Mathematical and General, 1995Summary: Biconvection is a fluid instability common to many biological organisms including swimming bacteria, alga and protozoa. The statistics of biconvective pattern formation is tested against percolation models for space-filling. A percolation threshold is found \((p= 0.63)\) and compared to theoretical point distributions for random tesselations ...
Noever, David A. +3 more
openaire +1 more source
Bioluminescent monitoring of turbulent bioconvection
Luminescence, 2006AbstractUnder adjusted experimental conditions, open‐to‐air cultures of lux gene‐engineered Ralstonia eutropha (wholecell biosensors of copper) exhibit bioconvection, which accounts for fluctuating bioluminescence. The power spectrum of bioluminescence intensity fluctuations recorded from a cylindrical sample 9 mm in diameter and ∼10 mm in height is ...
openaire +2 more sources
THE ROLE OF BIOCONVECTION IN PLANKTON POPULATION WITH THERMAL STRATIFICATION
International Journal of Bifurcation and Chaos, 2010This paper investigates hydrodynamic processes of suspended planktonic population within a thermal stratification to represent a thermocline, in using a model of coupled equations: Navier–Stokes' equation for the fluid dynamic motion, Fisher's equation for the planktonic population with logistic growth, energy conservation equation for thermal effects
Tri Nguyen-Quang, Frédéric Guichard
openaire +1 more source