... of a Pitching Airfoil ,” J. Aerosp. Eng. , 32 ( 1 ), p. 04018120 . 10.1061/(ASCE)AS.1943-5525.0000944 The unsteady flow over the airfoil is simulated by solving the previously-mentioned two-dimensional Navier–Stokes equations using a commercial computational fluid dynamics (CFD) package ansys...

... α c , relative to Newtonian fluids. For the unsteady flow, the lift coefficient versus time curve exhibits oscillatory behavior, and this has been used to delineate the flow regime as steady or unsteady flow. For unsteady flow regimes, both the amplitude of the lift coefficient and the Strouhal...

...Fan Zhang; Ke Chen; Desmond Appiah; Shouqi Yuan; Kofi Asamoah Adu-Poku; Feng Hong To investigate the unsteady flow characteristics in side channel pumps, the vortex structures and their evolutions in the impeller and side channel flow passages have been comprehensively studied. Systematically...

...)81032-3 [6] Jia , X. Q. , Zhu , Z. C. , Yu , X. L. , and Zhang , Y. L. , 2019 , “ Internal Unsteady Flow Characteristics of Centrifugal Pump Based on Entropy Generation Rate and Vibration Energy ,” Proc. Inst. Mech. Eng., Part E , 233 ( 3 ), pp. 456 – 473 . 10.1177...

... ) ( > 0 ) is the temporal variation of the strain rate which categorizes the stagnation-point flow problems into two classes as given below: (11) s ( t ) = 1 β ( t 0 − t ) ,             unsteady   flow   with   β ≠ 0 = constant   ( = 1...

...: Chunill Hah. 19 09 2012 03 07 2013 In this study, a reciprocating-type water turbine model that applies the principle of the Weis-Fogh mechanism was proposed, and the model's unsteady flow field was calculated by an advanced vortex method. The primary conditions were as follows: wing...

.... On the left side of Fig. 7 , the meshed stator with the outlet is shown, while the meshed rotor with the inlet pipe is shown on the right side. Fig. 7 Control volume mesh of centrifugal vortex pump stage Numerical simulations of the unsteady flow in centrifugal, centrifugal vortex pumps...

... and subvalleys can be found. The effects of unsteady flow in the side chambers on the entire passage flow cannot be neglected for accurately predicting the inner flow of the pump. The results of unsteady pressure fluctuation magnitude can be used to guide the optimum design of the single-blade pump to decrease...

... solution of Reynolds averaged Navier–Stokes (RANS) equations with k-ε turbulence model and good agreement was achieved. New experimental data can be useful for scientific community to validate numerical models. 08 07 2011 15 05 2012 09 08 2012 09 08 2012 dam-break unsteady flow...

... computational fluid dynamics unsteady flow compressible flow SI-engine simulation The usual pulsating flow in the exhaust gas of an automotive power train system causes an unsteady flow at the inlet to the turbocharger turbine. In a four cylinder four stroke engine, the pulse frequency varies...

... frequency, π f 0 c / U 0 ρ 0 freestream density μ 0 freestream dynamic viscosity References 1 Raffel , M. , Kompenhans , J. , and Wernert , P. , 1995 , “ Investigation of the Unsteady Flow Velocity Field Above...

... methods, namely, velocity feedback and pressure feedback, are applied and compared experimentally under the steady and unsteady conditions using an unsteady flow generator. The calculation time and accuracy of the proposed simulation are investigated when the feedback values are either the flow velocities...

... that if the mesh elements are more than 2.5 × 10 6 the simulation will be good enough for this study though the higher ones would be better in particular for unsteady flow analysis. N and η versus mesh elements; (–◼–) calculated power, (– –) tested power, ( -- ★...

... results are also presented for the flow around the double-deck bus in three different gust scenarios: a gust in a wind tunnel, a gust in natural open air, and a gust when the bus exits a tunnel. The simulations show that the aerodynamic coefficients fluctuate strongly inside the tunnel. The unsteady flow...

... ships vortices aerodynamics channel flow diffusion drag computational fluid dynamics vortex method propulsion mechanism unsteady flow Figure 1 shows the analytical model of a Weis-Fogh-type ship propulsion mechanism. The figure shows the upper part of the model; the wing...