Gravitactic Bio-Thermal Convection Oscillates Vertically in a Porous Layer

The onset of stationary convection is examined in a homogeneous suspension of gravitactic micro-swimmers in a thermally stratified porous layer subject to vertical oscillation. For the situation of high-frequency and low-amplitude vertical oscillation, the governed model-averaged differential equations are presented. The monotonic stability boundary for stationary convection was obtained using the Galerkin method. The influence of the altered thermal Rayleigh-Darcy number, \(R_{a}\) , on the modified bioconvection Rayleigh-Darcy number, \(R_{b}\) , is numerically examined. Due to porous media, the bioconvection strength is less in results than its non-existence.