Experimental study on bubble induced velocity fluctuations in the boundary layer at transitional Reynolds numbers

Boundary Layer Trips on Airfoils at Low Reynolds Numbers

Three categories of boundary layer trips (single 2-D plain. multiple 2-D plain, and 3-D trips) were tested on the l\106-13-128, E374, and SD7037 airfoils over t he Reynolds numbers of 100,000 to 300,000. Flow visualization and drag data were acquired for a number of trip heights and locations. To facilitate comparisons between airfoils, t rips were located relative to untripped laminar separati...

Boundary induced non linearities at small Reynolds Numbers

We investigate the influence of boundary slip velocity in Newtonian fluids at finite Reynolds numbers. Numerical simulations with Lattice Boltzmann method (LBM) and Finite Differences method (FDM) are performed to quantify the effect of heterogeneous boundary conditions on the integral and local properties of the flow. Non linear effects are induced by the non homogeneity of the boundary condit...

Shear layer instability at low reynolds numbers

Boundary Layer and Separation Control on Wings at Low Reynolds Numbers

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Axisymmetric bubble pinch-off at high Reynolds numbers.

Analytical considerations and potential-flow numerical simulations of the pinch-off of bubbles at high Reynolds numbers reveal that the bubble minimum radius, rn, decreases as tau proportional to r2n sqrt[1lnr2n], where tau is the time to break up, when the local shape of the bubble near the singularity is symmetric. However, if the gas convective terms in the momentum equation become of the or...