[PDF] Top 20 Numerical Investigation of Flow over Cylinders with and without Grooves

... For two dimensional computations over the model, a structured grid consisting of quadrilateral cells were used. The grid independence test must be done by transforming the generated physical model into a mesh with ... See full document

... diverge as they approach the cylinder, wrap around and re-contract downstream, similar to two-dimensional flow. Small three-dimensional effects occur at the top and at the bottom of the cylinder, due to the ... See full document

... (Watson, 1995) pointed out that the pressure field given by Smith's asymptotic form is not single-valued and proposed that an additional term to Jeffery's Fourier series is necessary. However, he did not derive the ... See full document

... fluid flow in the narrow gap with radial grooves between the two cylinders, when the inner cylinder is eccentrically deposited and held simultaneously rotating and precessing circular ...by ... See full document

... the numerical predictions, an experimental rig was constructed and adequately instrumented, ...air flow in the tunnel was controlled by varying the frequency of the driving motor, and the working section ... See full document

... study numerical simulation of two-dimensional viscous flow over two circular cylinders with different ...The flow structure depends on the rate of rota- tion, the gap-spacing and the ... See full document

... capacity. Flow phenomena around cylinders were investigated for live-bed and clear water scour using Computational Fluid Dynamics (CFD) software ...from numerical simulations agreed well with the ... See full document

... of flow control for the bluff cylinder and present results of comparing regions of attenuating instabilities using a small secondary ...control cylinders on the main ...of flow using the flow ... See full document

... current investigation is concentrated on vortex generated oscillations and vortex shedding owing to elastically fixed pair of ...the flow to be laminar and incompressible. The numerical model ... See full document

... circular cylinders in cross flow arranged in tandem configuration in the stream wise direction and with the additional interference of the ...the flow field, introducing asymmetry in the typical Von ... See full document

... the flow faithfully at every instant of ...the flow fluctuations and ...critical flow areas where large gradients of velocity are expected, such as vortex cores and shear ... See full document

... In order to keep the computational requirements to the minimum, we first carry out a LES at one half the above-mentioned resolu- tion. The LES is run for around 30T 共 where T =d /u ␶ is the large- eddy turnover time兲 to ... See full document

... The numerical simulation allowed us to quantify the effect of the wings at the same time on the mean variables and especially on the turbulent ...rotating cylinders with ... See full document

... the flow velocity at the separation point to become slower, and consequently the static pressure to become ...governs over all pressures in the entire flow separation ...the flow separation ... See full document

... into flow-altering countermeasures for emergent cylinders, particularly with ...shallow flow due to the associated weakening of the downflow; as flow depth decreases, the downward momentum of ... See full document

... On the other hand, Merkin [] has shown that in general, there are four com- mon heating processes specifying the wall-to-ambient temperature distributions, namely (i) constant or prescribed wall temperature; (ii) ... See full document

... present investigation requires a knowledge of the jet flow over a curved wall w i t hout an initial gap to find the effect of the ...jet flow over a curved wall without a gap are ... See full document

... laminar flow (or its effect was too small to be measured using techniques available at that ...turbulent flow and its presence always resulted in an increase of the flow ...of grooves aligned ... See full document

... contour over a range of backpressures upto design ...the flow cannot be expanded thus formation of shock and flow separation can be seen which leads to huge side loads on nozzle ...though ... See full document

... The results obtained have demonstrated the effect of change of spacing on the phase change process from water to steam. The convective heat transfer from the surface of the cylinder to the water is also affected by the ... See full document