Sgen Summary Report: Cfd Modeling Of Horizontal Steam Generators

A porosity model for the secondary side of the steam generator is formulated by following the ideas presented earlier by Stosic and Stevanovic [Num. Heat Transfer, Part B, 41, 263 (2002)]. Porosity model means that the secondary side geometry is not described in detail but the tubes of the primary circuit are modeled as sources of enthalpy and as pressure loss. The Euler-Euler multiphase model of the Fluent CFD code is used, where conservation laws for mass, momentum and enthalpy of liquid and vapor are included. The source term for enthalpy is obtained by performing an A-PROS simulation of the primary circuit. The source terms for the conservation equations are implemented by using User-Defined Functions of Fluent. The model is tested by performing test simulations for a horizontal steam generator of a VVER-440 nuclear power plant. The main features of the test simulation are discussed.