Numerical simulation of a viscous separation flow around a rotating circular cylinder

2006 ◽  
Vol 79 (3) ◽  
pp. 496-502 ◽  
Author(s):  
A. B. Mazo ◽  
I. V. Morenko
Keyword(s):  
Numerical Simulation ◽  
Circular Cylinder ◽  
Separation Flow ◽  
Rotating Circular Cylinder

Direct Numerical Simulation of Turbulent Flow and Mass Transfer Around a Rotating Circular Cylinder

2005 ◽  
Author(s):  
Jong-Yeon Hwang ◽  
Kyung-Soo Yang ◽  
Klaus Bremhorst
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Reynolds Number ◽  
Circular Cylinder ◽  
Direct Numerical Simulation ◽  
Turbulent Flow ◽  
Friction Velocity ◽  
Concentration Field ◽  
Rotating Circular Cylinder ◽  
Instantaneous Concentration

Characteristics of turbulent flow and mass transfer around a rotating circular cylinder are investigated by Direct Numerical Simulation. Mass-transfer results are presented at a high Schmidt number (Sc = 1670). The concentration field is computed for three different cases of low Reynolds number, Re*R = 161, 348 and 623, based on the cylinder radius and friction velocity. Results confirm that the thickness of Nernst diffusion layer is very small compared with that of viscous sub-layer in the case of high Sc mass transfer. A strong correlation of the concentration field with streamwise and vertical velocity components is noticed. However, that is not the case with the spanwise velocity component. Visualization of instantaneous concentration reveals that the length scale of concentration fluctuation typically decreases as Reynolds number increases. The correlation between Sherwood number and Reynolds number is consistent with other experiments currently available.

Direct Numerical Simulation of Turbulent Flow Around a Rotating Circular Cylinder

2006 ◽  
Vol 129 (1) ◽  
pp. 40-47 ◽  
Author(s):  
Jong-Yeon Hwang ◽  
Kyung-Soo Yang ◽  
Klaus Bremhorst
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Circular Cylinder ◽  
Direct Numerical Simulation ◽  
Turbulent Flow ◽  
Plane Channel ◽  
Outer Region ◽  
Wave Number ◽  
Boundary Layer Flows ◽  
Rotating Circular Cylinder

Turbulent flow around a rotating circular cylinder has numerous applications including wall shear stress and mass-transfer measurement related to the corrosion studies. It is also of interest in the context of flow over convex surfaces where standard turbulence models perform poorly. The main purpose of this paper is to elucidate the basic turbulence mechanism around a rotating cylinder at low Reynolds numbers to provide a better understanding of flow fundamentals. Direct numerical simulation (DNS) has been performed in a reference frame rotating at constant angular velocity with the cylinder. The governing equations are discretized by using a finite-volume method. As for fully developed channel, pipe, and boundary layer flows, a laminar sublayer, buffer layer, and logarithmic outer region were observed. The level of mean velocity is lower in the buffer and outer regions but the logarithmic region still has a slope equal to the inverse of the von Karman constant. Instantaneous flow visualization revealed that the turbulence length scale typically decreases as the Reynolds number increases. Wavelet analysis provided some insight into the dependence of structural characteristics on wave number. The budget of the turbulent kinetic energy was computed and found to be similar to that in plane channel flow as well as in pipe and zero pressure gradient boundary layer flows. Coriolis effects show as an equivalent production for the azimuthal and radial velocity fluctuations leading to their ratio being lowered relative to similar nonrotating boundary layer flows.

Flows past a rotating circular cylinder by the discrete vortex method.

1989 ◽  
Vol 9 (34) ◽  
pp. 273-276
Author(s):  
Takeyoshi Kimura ◽  
Michihisa Tsutahara ◽  
Zhong-yi Wang ◽  
Hiroshi Ishii
Keyword(s):  
Circular Cylinder ◽  
Vortex Method ◽  
Discrete Vortex ◽  
Discrete Vortex Method ◽  
Rotating Circular Cylinder

Investigation on conjugate mixed convection inside a square cavity with heat generating rotating circular cylinder

2021 ◽  
Author(s):  
Ehsanul Azim ◽  
Md. Jahid Hasan Sagor ◽  
Abul Borkot Md Rafiqul Hasan ◽  
Sumon Saha
Keyword(s):  
Circular Cylinder ◽  
Mixed Convection ◽  
Square Cavity ◽  
Rotating Circular Cylinder
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