Lattice Boltzmann simulation of the convective heat transfer from a stream-wise oscillating circular cylinder

Flow over an inline oscillating circular cylinder in the wake of a stationary circular cylinder

“…The cylinder oscillates in a sinusoidal fashion of X=Asin(2πf e t). Figure 4(a) shows the time histories of the cylinder lift coefficient, which is fairly comparable with the results in Bao et al (2012a). It is noted that the lift force is not symmetrical in time histories, that is, the mean of C L is non-zero.…”

“…Synchronization was also observed when f e /f so >3 (Öngören and Rockwell 1988). Moreover, a further synchronization occurred for f e /f so ≈1 at large A/D (Barbi et al 1986, Bao et al 2012a. At f e /f so =1, Perdikaris et al (2009) attributed chaos in the cylinder wake to the competition between the wake's natural mode and the mode forced by the oscillating cylinder.…”

Heat transfer past rotationally oscillating circular cylinder heated with time‐periodic pulsating temperature in a uniform flow

“…Att t P = + (1) 0 , the negative temperature convects away downstream and the fluid surrounding the cylinder regains a F I G U R E 10 The variation of local Nusselt number (Nu) and isotherm contours over a period of temperature for Re = 180, α = 0.5 m , f f = 0.5 0 ∕ , a = 0.5 and (A) P = 0.01, (B) P = 0.1, (C) P = 1, (D) P = 10, (E) P = 100 F I G U R E 9 (A) Nu, ((B)-(F)) isotherm contours superimposed with streamlines during a period of temperature for Re = 180, Pr = 0.7, a = 1.5, P = 1, α = higher temperature. In this figure, Nu varies approximately in the range (−160, 170) for P = 0.01, (−100, 120) for P = 0.1, (−40, 50) for P = 1, (−14,34) for P = 10 and (−6, 30) for P = 100. The rate of heat transfer decreases as the period increases for this amplitude a = 1.5 of the pulsating temperature.…”

“…Studying oscillation of isothermal cylinder in fluid flow is a very important aspect as it has contribution to enhancing the heat transfer process. Many researchers got inspired by this idea and studied the heat transfer with transverse oscillations 4–10 and streamwise oscillations 11–14 . However, rotational oscillation has an edge over transverse and stream‐wise oscillations for various applications with very difficult space constraints.…”

“…Many researchers got inspired by this idea and studied the heat transfer with transverse oscillations [4][5][6][7][8][9][10] and streamwise oscillations. [11][12][13][14] However, rotational oscillation has an edge over transverse and stream-wise oscillations for various applications with very difficult space constraints. Also, it is important to note that these studies have produced conflicting results.…”