화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.16, No.3, 117-128, September, 2004
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Vortex behavior in the inertial flow of viscoelastic fluids past a confined cylinder
Ju Min Kim, Chongyoup Kim, Changkwon Chung1, Kyung Hyun Ahn1, and Seung Jong Lee1, †
  • Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Korea
  • 1School of Chemical Engineering, Seoul National University, Seoul 151-744, Korea
E-mail:
The effect of molecular parameters on the steady vortex behaviors in the inertial viscoelastic flow past a cylinder has been investigated. FENE-CR model was considered as a constitutive equation. A recently developed iterative solution method (Kim et al., (in press)) was found to be successfully applicable to the computation of inertial viscoelastic flows, The high-resolution computations were carried out to understand the detailed flow behaviors based on the efficient iterative solution method armed with ILU(O) type preconditioner and BiCGSTAB method. The discrete elastic viscous split stress-G/streamline upwind PetrovGalerkin (DEVSS-G/SUPG) formulation was adopted as a stabilization method. The vortex size decreased as elasticity increases. However, the vortex enhancement was also observed in the case of large extensibility, which means that the vortex behavior is strongly dependent upon the material parameters. The longitudinal gradient of normal stress was found to retard the formation of vortex, whereas the extensional viscosity played a role in the vortex enhancement. The present results are expected to be helpful for understanding the inertial vortex dynamics of viscoelastic fluids in the flow past a confined cylinder.
Keywords:vortex behavior;flow past a confined cylinder;FENE-CR;DEVSS-G/SUPG;iterative solver
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