Fluid Structure Interaction Analysis of a Surge-line Using Coupled CFD-FEM

摘要

The thermal stresses in the surge lines due to thermal stratification is a widely observed phenomenon, in this paper a steady state analysis of the flow in surge line was conducted to analyze a long term outlook of surge line under continued stress, the results are concluded in the flowing points.1. The stresses in the surge line are present in the steady state especially in the section of the surge line near the main pipe, these stress exists due to the thermal stratification where the mixing of hot and cold water takes place.2. The equivalent stress show that as we move further away from the hot leg of the main pipe the stresses first decrease and then start to reach a very high value near the pressurizer opening, this is due to the extremely high temperature at the inlet of the surgeline.3. The deformation resulting from these stresses effect mostly the middle of the surge line pipe as there is no support between the endpoints in a considerably large structure, for practical purposes support of some kind are recommended in between the pressurizer and the main pipe.4. An approximation of the outer surface structure temperature based on the temperature of fluid at the boundary was also calculated from the simulated results, this can be useful in practical implementation where fluid data from sensors is generally available.