An experimental channel intended for investigation of a wake behind cooled cylinder was designed and constructed in this work. The setup is measurements with air at low Reynolds numbers. measuring techniques based on the standard visualization fog generator constant temperature anemometry (CTA) were used. flow performance investigated two cylinders placed inside square cross section. One kept t...

By immersing a compliant yet self-supporting sheet into flowing water, we study a heavy, streamlined, and elastic body interacting with a fluid. We find that above a critical flow velocity a sheet aligned with the flow begins to flap with a Strouhal frequency consistent with animal locomotion. This transition is subcritical. Our results agree qualitatively with a simple fluid dynamical model th...

The technique of large-eddy simulation (LES) has been applied to the study of pulsatile flow through a modeled arterial stenosis. A simple stenosis model has been used that consists of a one-sided 50 percent semicircular constriction in a planar channel. The inlet volume flux is varied sinusoidally in time in a manner similar to the laminar flow simulations of Tutty (1992). LES is used to compu...

To investigate the characteristics of flow over two finite-length cylinders in tandem arrangement, numerical simulations were performed using CFD technique for spacing ratios (S = D/d, where d is diameter and D separation gap between cylinders) 0.5 12 at a Reynolds number 200. The height-to-diameter ratio (h/d, h height was fixed 8. This study primarily focuses on effects S free ends vortical s...

The flow instability of a double-blade centrifugal pump is more serious due to its special design feature with two blades and large passages. dynamic instabilities pressure pulsations can affect the performance operating lifetime. In present study, numerical investigation unsteady time variation within complete was carried out. domain frequency were extracted at 16 monitoring locations covering...

• Without slip at the wall, alternate vortex shedding occurs behind cylinder With double cylinder. Good correlation between numerical predictions and experimental results. Vortex frequency decreases as yield stress increases or inertia Viscoelastic effects are slight. Two-dimensional unsteady inertial flows of a fluid around were studied experimentally. Carbopol aqueous gels, well-known model f...

The aerodynamic properties of a two-dimensional cactus-shaped cylinder with four ribs are studied experimentally. cross section the corresponds to modified square rounded corners and concave sides inspired by tall succulents ribs. mean coefficients, fluctuating lift coefficient, Strouhal number, surface pressure distribution measured as function angular orientation for Reynolds numbers ranging ...

Direct numerical simulations of flow past cactus-shaped cylinders are performed at Reynolds numbers of 20, 100, and 300. The results are contrasted to those from smooth cylinders at the same Reynolds numbers. The cavities in the cactus-shaped cylinders are seen to reduce the forces acting on them. At Reynolds number of 20, the drag is reduced by 22% due to reduction in the viscous forces. At Re...

We analyzed the flow fields characterized by chord-based Reynolds numbers of 5000 to 15,000 over a stationary model of a hummingbird (Calypte anna) wing. Utilizing two experimental techniques, constant-temperature anemometry and stereo particle image velocimetry, the high-fidelity results depict a laminar-to-turbulent transition process that develops over the wing. At both zero and non-zero ang...