Unsteady flow computations for flow past multiple moving boundaries using LSKUM

2007 ◽  
Vol 36 (10) ◽  
pp. 1592-1608 ◽  
Author(s):  
V. Ramesh ◽  
S.M. Deshpande
Keyword(s):  
Unsteady Flow ◽  
Moving Boundaries ◽  
Flow Past

Computation of unsteady flow past a cylinder instantaneously set in motion

1977 ◽  
Vol 17 (5) ◽  
pp. 671-677
Author(s):  
V. I. Kravchenko ◽  
Yu. D. Shevelev ◽  
V. V. Shchennikov
Keyword(s):  
Unsteady Flow ◽  
Flow Past ◽  
Flow Past A Cylinder

Flow Unsteadiness and Stability Characteristics of Low-Re Flow Past an Inclined Triangular Cylinder

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Wei Zhang ◽  
Hui Yang ◽  
Hua-Shu Dou ◽  
Zuchao Zhu
Keyword(s):  
Growth Rate ◽  
Sensitivity Analysis ◽  
Unsteady Flow ◽  
Maximum Velocity ◽  
Flow Patterns ◽  
Wake Flow ◽  
Near Wake ◽  
Flow Unsteadiness ◽  
Flow Past ◽  
Far Wake

The present study investigates the two-dimensional flow past an inclined triangular cylinder at Re = 100. Numerical simulation is performed to explore the effect of cylinder inclination on the aerodynamic quantities, unsteady flow patterns, time-averaged flow characteristics, and flow unsteadiness. We also provide the first global linear stability analysis and sensitivity analysis on the targeted physical problem for the potential application of flow control. The objective of this work is to quantitatively identify the effect of cylinder inclination on the characteristic quantities and unsteady flow patterns, with emphasis on the flow unsteadiness and instability. Numerical results reveal that the flow unsteadiness is generally more pronounced for the base-facing-like cylinders (α → 60 deg) where separation occurs at the front corners. The inclined cylinder reduces the velocity deficiency in the near-wake, and the reduction in far-wake is the most notable for the α = 30 deg cylinder. The transverse distributions of several quantities are shifted toward the negative y-direction, such as the maximum velocity deficiency and maximum/minimum velocity fluctuation. Finally, the global stability and sensitivity analysis show that the spatial structures of perturbed velocities are quite similar for α ≤ 30 deg and the temporal growth rate of perturbation is sensitive to the near-wake flow, while for α ≥ 40 deg there are remarkable transverse expansion and streamwise elongation of the perturbed velocities, and the growth rate is sensitive to the far-wake flow.

Unsteady flow past a flat plate with suction

1975 ◽  
Vol 81 (5) ◽  
pp. 215-219 ◽  
Author(s):  
G. N. Purohit ◽  
M. C. Goyal
Keyword(s):  
Unsteady Flow ◽  
Flat Plate ◽  
Flow Past

UNSTEADY FLOW PAST ELLIPTIC CYLINDERS

1997 ◽  
Vol 11 (6) ◽  
pp. 555-595 ◽  
Author(s):  
M.T. Nair ◽  
T.K. Sengupta
Keyword(s):  
Unsteady Flow ◽  
Flow Past

High-order accurate simulations of unsteady flow past plunging and pitching airfoils

2011 ◽  
Vol 40 (1) ◽  
pp. 236-248 ◽  
Author(s):  
Chunlei Liang ◽  
Kui Ou ◽  
Sachin Premasuthan ◽  
Antony Jameson ◽  
Z.J. Wang
Keyword(s):  
Unsteady Flow ◽  
High Order ◽  
Flow Past

Mathematical simulation of unsteady flow past a wing with jets

1982 ◽  
Vol 17 (3) ◽  
pp. 440-445 ◽  
Author(s):  
S. M. Belotserkovskii ◽  
V. V. Gulyaev ◽  
V. V. Yakovlev
Keyword(s):  
Unsteady Flow ◽  
Mathematical Simulation ◽  
Flow Past

Unsteady flow past a rotating circular cylinder at Reynolds numbers 103 and 104

1990 ◽  
Vol 220 ◽  
pp. 459-484 ◽  
Author(s):  
H. M. Badr ◽  
M. Coutanceau ◽  
S. C. R. Dennis ◽  
C. Ménard
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Unsteady Flow ◽  
Rotation Rate ◽  
Stokes Equations ◽  
Reynolds Numbers ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Number Range ◽  
Flow Past

The unsteady flow past a circular cylinder which starts translating and rotating impulsively from rest in a viscous fluid is investigated both theoretically and experimentally in the Reynolds number range 103 [les ] R [les ] 104 and for rotational to translational surface speed ratios between 0.5 and 3. The theoretical study is based on numerical solutions of the two-dimensional unsteady Navier–Stokes equations while the experimental investigation is based on visualization of the flow using very fine suspended particles. The object of the study is to examine the effect of increase of rotation on the flow structure. There is excellent agreement between the numerical and experimental results for all speed ratios considered, except in the case of the highest rotation rate. Here three-dimensional effects become more pronounced in the experiments and the laminar flow breaks down, while the calculated flow starts to approach a steady state. For lower rotation rates a periodic structure of vortex evolution and shedding develops in the calculations which is repeated exactly as time advances. Another feature of the calculations is the discrepancy in the lift and drag forces at high Reynolds numbers resulting from solving the boundary-layer limit of the equations of motion rather than the full Navier–Stokes equations. Typical results are given for selected values of the Reynolds number and rotation rate.

Computation of unsteady flow past blunt bodies

1991 ◽  
Vol 12 (6) ◽  
pp. 521-529
Author(s):  
Yao De-liang ◽  
Bian Yin-gui
Keyword(s):  
Unsteady Flow ◽  
Flow Past ◽  
Blunt Bodies
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