Author(s): Vladimir Kriventsev; Hisashi Ninokata

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Abstract: The results of numerical simulation of fluid flow and heat transfer in rod bundles with geometrical disturbance to the hexagonal rod array configuration are presented. The geometry of the rod bundle was chosen according to the flow and temperature distributions available from the experimental data. Reynolds equation for axial velocity component were simulated in two dimensions. Turbulent shear stresses were modeled by the turbulent eddy viscosity with anisotropy defined for radial and azimuthal components. Secondary flows were not taken into consideration. Also, the averaged energy conservation equation closed with anisotropic turbulent conductivity coefficients was simulated. Reynolds and energy conservation equations were discretizated by the Efficient Finite-Difference (EFD) scheme based on the" locally exact" analytical solution. A comparison of the accuracy of the EFD method and traditional central-difference and upwind schemes were performed. The benchmark problem was simulated using components of the Computational Object-Oriented Library for Fluid Dynamics (COOLFD) which is a new-generation programming tool aimed to improve the development of the CFD application to complex calculation areas such as rod bundles in nuclear reactors. Comparisons of calculated results and experimental data are presented for the local shear stress, axial velocity and the wall temperature distributions in the" geometrically disturbed" region around the dislocated rod.

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Year: 1999