PRALITS , Jan Oscar

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Mixing control in fluid environments having very low Reynolds numbers is a crucial need for many practical purposes ranging from biochemistry analysis in microfluidic devices, where mixing has to be rapid and efficient, to lab-on-a-chip applications, where mixing has to be reduced to avoid spurious effects as in microfluidic rheometer...

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A simple approach is described for computing spatially extended, weakly nonlinear optimal disturbances, suitable for maintaining a disturbance-regeneration cycle in a simple shear flow. Weakly nonlinear optimals, computed over a short time interval for the expansion used to remain tenable, are oblique waves which display a shorter streamwise...

We present a theory for computing the optimal steady suction distribution in order to minimize the growth of convectively unstable disturbances, and thus delay laminar-turbulent transition on swept wings. Here, we use the optimal control theory and minimize an objective function based on a sum of the kinetic energy of an arbitrary number of...

Purpose: To investigate the effects of implantation of a phakic iris-fixated intraocular lens (IOL) on aqueous flow in the anterior chamber. Methods: We use a mathematical model to study fluid flow in the anterior chamber in the presence of a IOL. The governing equations are solved numerically using the free software OpenFoam. Results: IOL...

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The two-dimensional flow around a rotating circular cylinder is studied at Re=100. The instability mechanisms for the first and second shedding mode are analysed: The region in the flow with a role of 'wave-maker' in the excitation of the global instability is identified by considering the structural sensitivity of the unstable mode. This...

A linear stability analysis of the laminar flow in the boundary layer at the bottom of a solitary wave is made to determine the conditions leading to transition and the appearance of turbulence. The Reynolds number of the phenomenon is assumed to be large and a 'momentary' criterion of instability is used. The results show that the laminar...

The two-dimensional stationary flow past a rotating cylinder is analyzed for both two and three-dimensional perturbations. The instability mechanisms for the high and low- frequency modes are analyzed and the complete neutral curve presented. It is shown that the first bifurcation in the case of the rotating cylinder occurs for stationary...

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The emergence of fluid instabilities in the relevant limit of vanishing fluid inertia (i.e., arbitrarily close to zero Reynolds number) has been investigated for the well-known Kolmogorov flow. The finite-time shear-induced order-disorder transition of the non-Newtonian microstructure and the corresponding viscosity change from lower to...